claudette

Claudette is Claude’s friend

NB: If you are reading this in GitHub’s readme, we recommend you instead read the much more nicely formatted documentation format of this tutorial.

Claudette is a wrapper for Anthropic’s Python SDK.

The SDK works well, but it is quite low level – it leaves the developer to do a lot of stuff manually. That’s a lot of extra work and boilerplate! Claudette automates pretty much everything that can be automated, whilst providing full control. Amongst the features provided:

• A Chat class that creates stateful dialogs
• Support for prefill, which tells Claude what to use as the first few words of its response
• Convenient image support
• Simple and convenient support for Claude’s new Tool Use API.

You’ll need to set the ANTHROPIC_API_KEY environment variable to the key provided to you by Anthropic in order to use this library.

Note that this library is the first ever “literate nbdev” project. That means that the actual source code for the library is a rendered Jupyter Notebook which includes callout notes and tips, HTML tables and images, detailed explanations, and teaches how and why the code is written the way it is. Even if you’ve never used the Anthropic Python SDK or Claude API before, you should be able to read the source code. Click Claudette’s Source to read it, or clone the git repo and execute the notebook yourself to see every step of the creation process in action. The tutorial below includes links to API details which will take you to relevant parts of the source. The reason this project is a new kind of literal program is because we take seriously Knuth’s call to action, that we have a “moral commitment” to never write an “illiterate program” – and so we have a commitment to making literate programming an easy and pleasant experience. (For more on this, see this talk from Hamel Husain.)

“Let us change our traditional attitude to the construction of programs: Instead of imagining that our main task is to instruct a computer what to do, let us concentrate rather on explaining to human beings what we want a computer to do.” Donald E. Knuth, Literate Programming (1984)

Install

pip install claudette

Getting started

Anthropic’s Python SDK will automatically be installed with Claudette, if you don’t already have it.

import os
# os.environ['ANTHROPIC_LOG'] = 'debug'

To print every HTTP request and response in full, uncomment the above line.

from claudette import *

Claudette only exports the symbols that are needed to use the library, so you can use import * to import them. Alternatively, just use:

import claudette

…and then add the prefix claudette. to any usages of the module.

Claudette provides models, which is a list of models currently available from the SDK.

models

['claude-opus-4-20250514',
 'claude-sonnet-4-20250514',
 'claude-3-opus-20240229',
 'claude-3-7-sonnet-20250219',
 'claude-3-5-sonnet-20241022']

For these examples, we’ll use Sonnet 4, since it’s awesome!

model = models[1]
model

'claude-sonnet-4-20250514'

Chat

The main interface to Claudette is the Chat class, which provides a stateful interface to Claude:

chat = Chat(model, sp="""You are a helpful and concise assistant.""")
chat("I'm Jeremy")

Hello Jeremy! Nice to meet you. How can I help you today?

• id: msg_01NNfbziMKnAULhH72Upzpzg
• content: [{'citations': None, 'text': 'Hello Jeremy! Nice to meet you. How can I help you today?', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 19, 'output_tokens': 18, 'server_tool_use': None, 'service_tier': 'standard'}

r = chat("What's my name?")
r

Your name is Jeremy.

• id: msg_01HoboBZtq6dtocz2UWht9ia
• content: [{'citations': None, 'text': 'Your name is Jeremy.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 45, 'output_tokens': 8, 'server_tool_use': None, 'service_tier': 'standard'}

r = chat("What's my name?")
r

Your name is Jeremy.

• id: msg_01SUAYui6JS3Jf65KYfsGWhU
• content: [{'citations': None, 'text': 'Your name is Jeremy.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 61, 'output_tokens': 8, 'server_tool_use': None, 'service_tier': 'standard'}

As you see above, displaying the results of a call in a notebook shows just the message contents, with the other details hidden behind a collapsible section. Alternatively you can print the details:

print(r)

Message(id='msg_01SUAYui6JS3Jf65KYfsGWhU', content=[TextBlock(citations=None, text='Your name is Jeremy.', type='text')], model='claude-sonnet-4-20250514', role='assistant', stop_reason='end_turn', stop_sequence=None, type='message', usage=In: 61; Out: 8; Cache create: 0; Cache read: 0; Total Tokens: 69; Search: 0)

Claude supports adding an extra assistant message at the end, which contains the prefill – i.e. the text we want Claude to assume the response starts with. Let’s try it out:

chat("Concisely, what is the meaning of life?",
     prefill='According to Douglas Adams,')

According to Douglas Adams,it’s 42. More seriously, many find meaning through relationships, personal growth, contributing to others, and pursuing what brings fulfillment.

• id: msg_01UkHn37YePdXg8NVrXk9Qu3
• content: [{'citations': None, 'text': "According to Douglas Adams,it's 42. More seriously, many find meaning through relationships, personal growth, contributing to others, and pursuing what brings fulfillment.", 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 89, 'output_tokens': 32, 'server_tool_use': None, 'service_tier': 'standard'}

You can add stream=True to stream the results as soon as they arrive (although you will only see the gradual generation if you execute the notebook yourself, of course!)

for o in chat("Concisely, what book was that in?", prefill='It was in', stream=True):
    print(o, end='')

It was in "The Hitchhiker's Guide to the Galaxy."

Async

Alternatively, you can use AsyncChat (or AsyncClient) for the async versions, e.g:

chat = AsyncChat(model)
await chat("I'm Jeremy")

Nice to meet you, Jeremy! How are you doing today? Is there anything I can help you with?

• id: msg_01HyDqMjwcKEc2V39xLWTwFf
• content: [{'citations': None, 'text': 'Nice to meet you, Jeremy! How are you doing today? Is there anything I can help you with?', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 10, 'output_tokens': 25, 'server_tool_use': None, 'service_tier': 'standard'}

Remember to use async for when streaming in this case:

async for o in await chat("Concisely, what is the meaning of life?",
                          prefill='According to Douglas Adams,', stream=True):
    print(o, end='')

According to Douglas Adams,it's 42. But more seriously, the meaning of life is likely something you create through your relationships, contributions, growth, and what brings you fulfillment - rather than something you discover pre-made.

Prompt caching

Claude supports prompt caching, which can significantly reduce token usage costs when working with large contexts or repetitive elements. When you use mk_msg(msg, cache=True), Claudette adds the necessary cache control headers to make that message cacheable.

Prompt caching works by marking segments of your prompt for efficient reuse. When a cached segment is encountered again, Claude reads it from the cache rather than processing the full content, resulting in a 90% reduction in token costs for those segments.

Some key points about prompt caching: - Cache writes cost 25% more than normal input tokens - Cache reads cost 90% less than normal input tokens - Minimum cacheable length is model-dependent (1024-2048 tokens) - Cached segments must be completely identical to be reused - Works well for system prompts, tool definitions, and large context blocks

For instance, here we use caching when asking about Claudette’s readme file:

chat = Chat(model, sp="""You are a helpful and concise assistant.""")

nbtxt = Path('README.txt').read_text()
msg = f'''<README>
{nbtxt}
</README>
In brief, what is the purpose of this project based on the readme?'''
r = chat(mk_msg(msg, cache=True))
r

Based on the README, Claudette is a high-level wrapper for Anthropic’s Python SDK that aims to simplify and automate working with Claude’s API. Its main purposes are:

1. Reduce boilerplate and manual work - It automates tasks that would otherwise require manual handling with the base SDK

2. Provide convenient features like:

   • Stateful chat dialogs via the Chat class
   • Support for prefill (controlling Claude’s response start)
   • Easy image handling
   • Simplified tool use API
   • Prompt caching support

3. Maintain full control while providing automation - you get convenience without losing flexibility

4. Educational value - It’s the first “literate nbdev” project, meaning the source code is written as a readable Jupyter Notebook with detailed explanations, making it both functional software and a teaching resource

The project essentially makes Claude’s API more ergonomic and user-friendly while preserving all the underlying capabilities.

• id: msg_011SNy9u95nspNq6PSnQuwBF
• content: [{'citations': None, 'text': 'Based on the README, Claudette is a high-level wrapper for Anthropic\'s Python SDK that aims to simplify and automate working with Claude\'s API. Its main purposes are:\n\n1. **Reduce boilerplate and manual work** - It automates tasks that would otherwise require manual handling with the base SDK\n2. **Provide convenient features** like:\n - Stateful chat dialogs via the [Chat](https://claudette.answer.ai/core.html#chat) class\n - Support for prefill (controlling Claude\'s response start)\n - Easy image handling\n - Simplified tool use API\n - Prompt caching support\n\n3. **Maintain full control** while providing automation - you get convenience without losing flexibility\n\n4. **Educational value** - It\'s the first "literate nbdev" project, meaning the source code is written as a readable Jupyter Notebook with detailed explanations, making it both functional software and a teaching resource\n\nThe project essentially makes Claude\'s API more ergonomic and user-friendly while preserving all the underlying capabilities.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 9287, 'input_tokens': 4, 'output_tokens': 223, 'server_tool_use': None, 'service_tier': 'standard'}

The response records the a cache has been created using these input tokens:

print(r.usage)

Usage(cache_creation_input_tokens=0, cache_read_input_tokens=9287, input_tokens=4, output_tokens=223, server_tool_use=None, service_tier='standard')

We can now ask a followup question in this chat:

r = chat('How does it make tool use more ergonomic?')
r

Based on the README, Claudette makes tool use more ergonomic in several key ways:

1. Simplified Function Definitions

Uses docments to make Python function definitions more user-friendly - you just need type hints and comments:

def sums(
    a:int,  # First thing to sum
    b:int=1 # Second thing to sum
) -> int: # The sum of the inputs
    "Adds a + b."
    return a + b

2. Automatic Tool Execution

Handles the tool calling process automatically. When Claude returns a tool_use message, you just call chat() again and Claudette: - Calls the tool with the provided parameters - Passes the result back to Claude - Returns Claude’s final response

No manual parameter extraction or result handling needed.

3. Multi-step Tool Workflows

The toolloop method can handle multiple tool calls in sequence to solve complex problems. For example, calculating (a+b)*2 automatically uses both addition and multiplication tools in the right order.

4. Easy Tool Integration

• Pass tools as a simple list to the Chat constructor
• Optionally force tool usage with tool_choice parameter
• Get structured data directly with Client.structured()

5. Reduced Complexity

Instead of manually handling tool use messages, parameter parsing, function calls, and result formatting that the base SDK requires, Claudette abstracts all of this away while maintaining full functionality.

This makes tool use feel more like natural function calling rather than complex API orchestration.

• id: msg_01XDJNpxiTkhTY9kbu17Q73L
• content: [{'citations': None, 'text': 'Based on the README, Claudette makes tool use more ergonomic in several key ways:\n\n## 1. **Simplified Function Definitions**\nUses docments to make Python function definitions more user-friendly - you just need type hints and comments:\n\n```python\ndef sums(\n a:int, # First thing to sum\n b:int=1 # Second thing to sum\n) -> int: # The sum of the inputs\n "Adds a + b."\n return a + b\n```\n\n## 2. **Automatic Tool Execution**\nHandles the tool calling process automatically. When Claude returns atool_usemessage, you just callchat()again and Claudette:\n- Calls the tool with the provided parameters\n- Passes the result back to Claude\n- Returns Claude\'s final response\n\nNo manual parameter extraction or result handling needed.\n\n## 3. **Multi-step Tool Workflows**\nThetoolloopmethod can handle multiple tool calls in sequence to solve complex problems. For example, calculating(a+b)*2automatically uses both addition and multiplication tools in the right order.\n\n## 4. **Easy Tool Integration**\n- Pass tools as a simple list to the [Chat](https://claudette.answer.ai/core.html#chat) constructor\n- Optionally force tool usage withtool_choiceparameter\n- Get structured data directly with [Client.structured()](https://claudette.answer.ai/core.html#client.structured)\n\n## 5. **Reduced Complexity**\nInstead of manually handling tool use messages, parameter parsing, function calls, and result formatting that the base SDK requires, Claudette abstracts all of this away while maintaining full functionality.\n\nThis makes tool use feel more like natural function calling rather than complex API orchestration.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 9287, 'input_tokens': 241, 'output_tokens': 374, 'server_tool_use': None, 'service_tier': 'standard'}

We can see that this only used ~200 regular input tokens – the 7000+ context tokens have been read from cache.

print(r.usage)

Usage(cache_creation_input_tokens=0, cache_read_input_tokens=9287, input_tokens=241, output_tokens=374, server_tool_use=None, service_tier='standard')

chat.use

In: 245; Out: 597; Cache create: 0; Cache read: 18574; Total Tokens: 19416; Search: 0

Tool use

Tool use lets Claude use external tools.

We use docments to make defining Python functions as ergonomic as possible. Each parameter (and the return value) should have a type, and a docments comment with the description of what it is. As an example we’ll write a simple function that adds numbers together, and will tell us when it’s being called:

def sums(
    a:int,  # First thing to sum
    b:int=1 # Second thing to sum
) -> int: # The sum of the inputs
    "Adds a + b."
    print(f"Finding the sum of {a} and {b}")
    return a + b

Sometimes Claude will try to add stuff up “in its head”, so we’ll use a system prompt to ask it not to.

sp = "Always use tools if math ops are needed."

We’ll get Claude to add up some long numbers:

a,b = 604542,6458932
pr = f"What is {a}+{b}?"
pr

'What is 604542+6458932?'

To use tools, pass a list of them to Chat:

chat = Chat(model, sp=sp, tools=[sums])

To force Claude to always answer using a tool, set tool_choice to that function name. When Claude needs to use a tool, it doesn’t return the answer, but instead returns a tool_use message, which means we have to call the named tool with the provided parameters.

r = chat(pr, tool_choice='sums')
r

Finding the sum of 604542 and 6458932

ToolUseBlock(id=‘toolu_01UUWNqtkMHQss345r1ir17q’, input={‘a’: 604542, ‘b’: 6458932}, name=‘sums’, type=‘tool_use’)

• id: msg_0199dXeVq11rc2veGNJVWc4k
• content: [{'id': 'toolu_01UUWNqtkMHQss345r1ir17q', 'input': {'a': 604542, 'b': 6458932}, 'name': 'sums', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 445, 'output_tokens': 53, 'server_tool_use': None, 'service_tier': 'standard'}

Claudette handles all that for us – we just call it again, and it all happens automatically:

chat()

604542 + 6458932 = 7,063,474

• id: msg_014wmCxnwQpgvnqKKto3RrxA
• content: [{'citations': None, 'text': '604542 + 6458932 = 7,063,474', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 527, 'output_tokens': 19, 'server_tool_use': None, 'service_tier': 'standard'}

You can see how many tokens have been used at any time by checking the use property. Note that (as of May 2024) tool use in Claude uses a lot of tokens, since it automatically adds a large system prompt.

chat.use

In: 972; Out: 72; Cache create: 0; Cache read: 0; Total Tokens: 1044; Search: 0

We can do everything needed to use tools in a single step, by using Chat.toolloop. This can even call multiple tools as needed solve a problem. For example, let’s define a tool to handle multiplication:

def mults(
    a:int,  # First thing to multiply
    b:int=1 # Second thing to multiply
) -> int: # The product of the inputs
    "Multiplies a * b."
    print(f"Finding the product of {a} and {b}")
    return a * b

Now with a single call we can calculate (a+b)*2 – by passing show_trace we can see each response from Claude in the process:

chat = Chat(model, sp=sp, tools=[sums,mults])
pr = f'Calculate ({a}+{b})*2'
pr

'Calculate (604542+6458932)*2'

for o in chat.toolloop(pr): display(o)

Finding the sum of 604542 and 6458932

I’ll help you calculate (604542+6458932)*2. I need to first add the two numbers, then multiply the result by 2.

• id: msg_019DZznw7qiEM2uEEcpNTnKs
• content: [{'citations': None, 'text': "I'll help you calculate (604542+6458932)*2. I need to first add the two numbers, then multiply the result by 2.", 'type': 'text'}, {'id': 'toolu_016NZ7MtE8oWHs5BSkxMcAN7', 'input': {'a': 604542, 'b': 6458932}, 'name': 'sums', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 539, 'output_tokens': 105, 'server_tool_use': None, 'service_tier': 'standard'}

{ 'content': [ { 'content': '7063474',
                 'tool_use_id': 'toolu_016NZ7MtE8oWHs5BSkxMcAN7',
                 'type': 'tool_result'}],
  'role': 'user'}

Finding the product of 7063474 and 2

Now I’ll multiply that result by 2:

• id: msg_01LmQiMRWAtTQz6sChqsbtMy
• content: [{'citations': None, 'text': "Now I'll multiply that result by 2:", 'type': 'text'}, {'id': 'toolu_019BQuhBzEkCWC1JMp6VtcfD', 'input': {'a': 7063474, 'b': 2}, 'name': 'mults', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 659, 'output_tokens': 82, 'server_tool_use': None, 'service_tier': 'standard'}

{ 'content': [ { 'content': '14126948',
                 'tool_use_id': 'toolu_019BQuhBzEkCWC1JMp6VtcfD',
                 'type': 'tool_result'}],
  'role': 'user'}

The answer is 14,126,948.

To break it down: - 604,542 + 6,458,932 = 7,063,474 - 7,063,474 × 2 = 14,126,948

• id: msg_0119DdeQ2goLFwGkXTXHFDsv
• content: [{'citations': None, 'text': 'The answer is **14,126,948**.\n\nTo break it down:\n- 604,542 + 6,458,932 = 7,063,474\n- 7,063,474 × 2 = 14,126,948', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 756, 'output_tokens': 61, 'server_tool_use': None, 'service_tier': 'standard'}

Structured data

If you just want the immediate result from a single tool, use Client.structured.

cli = Client(model)

def sums(
    a:int,  # First thing to sum
    b:int=1 # Second thing to sum
) -> int: # The sum of the inputs
    "Adds a + b."
    print(f"Finding the sum of {a} and {b}")
    return a + b

cli.structured("What is 604542+6458932", sums)

Finding the sum of 604542 and 6458932

[7063474]

This is particularly useful for getting back structured information, e.g:

class President:
    "Information about a president of the United States"
    def __init__(self, 
                first:str, # first name
                last:str, # last name
                spouse:str, # name of spouse
                years_in_office:str, # format: "{start_year}-{end_year}"
                birthplace:str, # name of city
                birth_year:int # year of birth, `0` if unknown
        ):
        assert re.match(r'\d{4}-\d{4}', years_in_office), "Invalid format: `years_in_office`"
        store_attr()

    __repr__ = basic_repr('first, last, spouse, years_in_office, birthplace, birth_year')

cli.structured("Provide key information about the 3rd President of the United States", President)

[President(first='Thomas', last='Jefferson', spouse='Martha Wayles Skelton Jefferson', years_in_office='1801-1809', birthplace='Shadwell, Virginia', birth_year=1743)]

Images

Claude can handle image data as well. As everyone knows, when testing image APIs you have to use a cute puppy.

fn = Path('samples/puppy.jpg')
Image(filename=fn, width=200)

We create a Chat object as before:

chat = Chat(model)

Claudette expects images as a list of bytes, so we read in the file:

img = fn.read_bytes()

Prompts to Claudette can be lists, containing text, images, or both, eg:

chat([img, "In brief, what color flowers are in this image?"])

The flowers in this image are purple.

• id: msg_01N2NCd5JW3gNsGysgmyMx9F
• content: [{'citations': None, 'text': 'The flowers in this image are purple.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 110, 'output_tokens': 11, 'server_tool_use': None, 'service_tier': 'standard'}

The image is included as input tokens.

chat.use

In: 110; Out: 11; Cache create: 0; Cache read: 0; Total Tokens: 121; Search: 0

Alternatively, Claudette supports creating a multi-stage chat with separate image and text prompts. For instance, you can pass just the image as the initial prompt (in which case Claude will make some general comments about what it sees), and then follow up with questions in additional prompts:

chat = Chat(model)
chat(img)

What an adorable puppy! This looks like a Cavalier King Charles Spaniel puppy with the classic Blenheim coloring (chestnut and white markings). The puppy has those characteristic sweet, gentle eyes and silky coat that the breed is known for. The setting with the purple flowers in the background makes for a lovely portrait - it really highlights the puppy’s beautiful coloring and sweet expression. Cavalier King Charles Spaniels are known for being friendly, affectionate companions. Is this your puppy?

• id: msg_01Jat1obwo79eEz5JMFAF4Mh
• content: [{'citations': None, 'text': "What an adorable puppy! This looks like a Cavalier King Charles Spaniel puppy with the classic Blenheim coloring (chestnut and white markings). The puppy has those characteristic sweet, gentle eyes and silky coat that the breed is known for. The setting with the purple flowers in the background makes for a lovely portrait - it really highlights the puppy's beautiful coloring and sweet expression. Cavalier King Charles Spaniels are known for being friendly, affectionate companions. Is this your puppy?", 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 98, 'output_tokens': 118, 'server_tool_use': None, 'service_tier': 'standard'}

chat('What direction is the puppy facing?')

The puppy is facing toward the camera/viewer. You can see the puppy’s face straight-on, with both eyes visible and looking directly at the camera. The puppy appears to be lying down with its head up and oriented forward, giving us a clear frontal view of its sweet face.

• id: msg_018EqaD7EFveLCzSPbQmMMuE
• content: [{'citations': None, 'text': "The puppy is facing toward the camera/viewer. You can see the puppy's face straight-on, with both eyes visible and looking directly at the camera. The puppy appears to be lying down with its head up and oriented forward, giving us a clear frontal view of its sweet face.", 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 227, 'output_tokens': 65, 'server_tool_use': None, 'service_tier': 'standard'}

chat('What color is it?')

The puppy has a chestnut (reddish-brown) and white coat. The ears and patches around the eyes are a rich chestnut or reddish-brown color, while the face has a white blaze down the center and the chest/front appears to be white as well. This is the classic “Blenheim” color pattern that’s common in Cavalier King Charles Spaniels - the combination of chestnut and white markings.

• id: msg_01HzUTvRziMrSfdEjbo1kHnh
• content: [{'citations': None, 'text': 'The puppy has a chestnut (reddish-brown) and white coat. The ears and patches around the eyes are a rich chestnut or reddish-brown color, while the face has a white blaze down the center and the chest/front appears to be white as well. This is the classic "Blenheim" color pattern that\'s common in Cavalier King Charles Spaniels - the combination of chestnut and white markings.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 300, 'output_tokens': 103, 'server_tool_use': None, 'service_tier': 'standard'}

Note that the image is passed in again for every input in the dialog, so that number of input tokens increases quickly with this kind of chat. (For large images, using prompt caching might be a good idea.)

chat.use

In: 625; Out: 286; Cache create: 0; Cache read: 0; Total Tokens: 911; Search: 0

Extended Thinking

Claude >=3.7 Sonnet and Opus have enhanced reasoning capabilities through extended thinking. This feature allows Claude to think through complex problems step-by-step, making its reasoning process transparent and its final answers more reliable.

To enable extended thinking, simply specify the number of thinking tokens using the maxthinktok parameter when making a call to Chat. The thinking process will appear in a collapsible section in the response.

Some important notes about extended thinking:

• Only available with select models
• Automatically sets temperature=1 when enabled (required for thinking to work)
• Cannot be used with prefill (these features are incompatible)
• Thinking is presented in a separate collapsible block in the response
• The thinking tokens count toward your usage but help with complex reasoning

To access models that support extended thinking, you can use has_extended_thinking_models.

has_extended_thinking_models

{'claude-3-7-sonnet-20250219',
 'claude-opus-4-20250514',
 'claude-sonnet-4-20250514'}

chat = Chat(model)

chat('Write a sentence about Python!', maxthinktok=1024)

Python is a versatile, high-level programming language known for its readable syntax and extensive libraries, making it popular for everything from web development to data science and machine learning.

Thinking

The user is asking for a sentence about Python. Since they didn’t specify, this could refer to either: 1. Python the programming language 2. Python the snake

Given the context and common usage, they’re most likely referring to the programming language Python. I’ll write a sentence about Python the programming language that’s informative and concise.

• id: msg_017EgYhUjsQxWkXN1zrRjFxK
• content: [{'signature': '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', 'thinking': "The user is asking for a sentence about Python. Since they didn't specify, this could refer to either:\n1. Python the programming language\n2. Python the snake\n\nGiven the context and common usage, they're most likely referring to the programming language Python. I'll write a sentence about Python the programming language that's informative and concise.", 'type': 'thinking'}, {'citations': None, 'text': 'Python is a versatile, high-level programming language known for its readable syntax and extensive libraries, making it popular for everything from web development to data science and machine learning.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 41, 'output_tokens': 119, 'server_tool_use': None, 'service_tier': 'standard'}

Web Search and Server Tools

Claude supports server-side tools that run on Anthropic’s infrastructure. The flagship example is the web search tool, which allows Claude to search the web for up-to-date information to answer questions.

Unlike client-side tools (where you provide functionality), server-side tools are managed by Anthropic. Claudette makes these easy to use with helper functions like search_conf().

chat = Chat(model, sp='Be concise in your responses.', tools=[search_conf()])
pr = 'What is the current weather in San Diego?'
r = chat(pr)
r

Based on the search results, here’s the current weather information for San Diego:

Today (Saturday, June 21st) has a high of 67°F ^{1 2} with cloudy conditions early with partial sunshine expected later ³. Winds are from the SSW at 10 to 15 mph ⁴.

Tonight’s low will be around 62°F with overcast conditions and SSW winds at 10 to 15 mph ⁵.

Temperatures are running about 4-7 degrees below normal for most areas ⁶, making it a cooler day than typical for this time of year in San Diego.

Air quality is currently at an unhealthy level for sensitive groups, so those with breathing sensitivities should reduce outdoor time if experiencing symptoms ⁷.

• id: msg_01Kg3aNFF7ibUcWZxPpFNmu8
• content: [{'id': 'srvtoolu_01YazfLE5GfK4ET2Z4rsfcuz', 'input': {'query': 'San Diego weather today'}, 'name': 'web_search', 'type': 'server_tool_use'}, {'content': [{'encrypted_content': 'EqcCCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDF5HWNC1GnRw10SRnBoMsafoy8BqdMy4chO3IjALzgdeA/d4dT1Qx7JKFu6XeXmrHYIe2lxVFl7TqZkRDnKmPpA6mnvpkwGh9eW8RJgqqgGtR4kEv8KoMeWf9VHjh1oYyscLkN5LJq00R4X3C/Cfw9oLLdIAiN9tvq9g2Rzm0Qb/IP5GcdVfiwx7w5dRfL67oaWQ5IFIXSvv9ByLW/ERFI30UKhhKFYumApVuZEIge6CL0j56OQFXAkPVENWIlSnro+9BIKgf866WWvRo0kx2d+SiX9p3ainG+Zqbl55Bq+mvyOUgVabtSEfr+oY6FQPJYYT9ad0QxYUOxgD', 'page_age': '3 days ago', 'title': '10-Day Weather Forecast for San Diego, CA - The Weather Channel | weather.com', 'type': 'web_search_result', 'url': 'https://weather.com/weather/tenday/l/San+Diego+CA?canonicalCityId=3b2b39ed755b459b725bf2a29c71d678'}, {'encrypted_content': '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', 'page_age': '3 days ago', 'title': 'San Diego, CA Weather Forecast | AccuWeather', 'type': 'web_search_result', 'url': 'https://www.accuweather.com/en/us/san-diego/92101/weather-forecast/347628'}, {'encrypted_content': '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', 'page_age': '3 days ago', 'title': 'San Diego weather forecast – NBC 7 San Diego', 'type': 'web_search_result', 'url': 'https://www.nbcsandiego.com/weather/'}, {'encrypted_content': 'EpcCCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDGlljWS7qosG4mSt3BoM6gy+Gh0f2zdXJ8kAIjAL5PfnNZR7Vex2zcFoqLody/xA+Yyoob62LVGMQ4+EhXd4CKgvxQEfpQLQgVvIH3UqmgGByQGU45dvgEJrKexyCEvra2CIAoYOTUiKNt6p7dVfp8++dfq28UU2mt5h10bL8ul8y0xeBu6new/tfwFJ6+GS/Bh6p+M+p87Jy65QQ/dgMhV+M7q3EAQUZjh642YMayI4nimm2yIwbLzNRXEszsp2kdmKKhxDpO3C5wp8fWLy5UpWvimjh5WSMnAzEpMoVDqD99FavgHvaPF7GAM=', 'page_age': '3 days ago', 'title': 'Weather Forecast and Conditions for San Diego, CA - The Weather Channel | Weather.com', 'type': 'web_search_result', 'url': 'https://weather.com/weather/today/l/San+Diego+CA?canonicalCityId=3b2b39ed755b459b725bf2a29c71d678'}, {'encrypted_content': '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', 'page_age': '3 days ago', 'title': 'San Diego, CA', 'type': 'web_search_result', 'url': 'https://www.weather.gov/sgx/'}, {'encrypted_content': 'EpkCCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDLXJ+1Ii8XIJ7AwW/xoMMbTKEdT8hw2J9bdSIjBYWJur7pQQqNijCyZjeN+VSYcaZe7xE/09hGS23TOjFLdvrOhGAMVSd3e2IDGUHCEqnAG6GJZO/sDcDEeEn/sobNJbNjM9VfNoJZEg+f/lZ+KXtMJELQ2Q14ot0iqQ0qKEjDxz3OMLkAYJg3uqeVMOq5QLgz6MNANEoCU+koTqIiYGZ++8Y0tKdtVD/Xrm0QW0fFkdJcN1PVt+6fN8aDJ5+95phOw5vEmRS9FRWg6aLDIwpxaNJ6z+Wbpff8zoSGUcPZFaFIUjAAU6qnx8kRoYAw==', 'page_age': None, 'title': 'San Diego, CA Weather Forecast | KGTV | kgtv.com', 'type': 'web_search_result', 'url': 'https://www.10news.com/weather'}, {'encrypted_content': 'EpQCCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDHL0i7qnzUCM4zRRAhoMAv3yQhl4BrqFyb0nIjBsyvNyrS90lUKCO/9admV9eU8x96+nDdrodoVAe9lpT2fNstMu4pS2Aer192MKKnwqlwGnu1DfFtpu/sSeugS3SUtYxT+ulZYw+ZQwhqLMOf+UadP2PrCAEDh5CM2pF4fMHRdt9GBYTgOA/3ug6W2Ci30q5QXwdiNC/7X2KQV6QrU83m//vy92K8PO9dwqv4B0T8uCSY18O+BtHHlZrzmzPgIWm4OTP2+Blh+f3X+yRubR9JiBehxtgS/IGmdWhzv6QjIbcFy5bhNDGAM=', 'page_age': '1 week ago', 'title': 'Hourly Weather Forecast for San Diego, CA - 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', 'encrypted_index': 'Eo8BCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDKwATF21Da6JaeprrRoMR4n2dYDzq6Grz6kOIjDubzeZ5yWRJE4JTY/En0I9Ue7hW3xNHVY1Nb651cmT84e3E/CK5IihYjOjT0ri+bMqEzkJobhLc+mcf18NFKDVD/eXWJkYBA==', 'title': 'San Diego, CA Weather Conditions | Weather Underground', 'type': 'web_search_result_location', 'url': 'https://www.wunderground.com/weather/us/ca/san-diego'}, {'cited_text': 'High 67F. ', 'encrypted_index': 'Eo8BCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDBZRJenhcEsF45RP3hoM9byW9q+/yaWr+G32IjAOpd1oMmv1j3abI8JHjvI1b5ZvEPvFR0RzxtY1jsxEyRv9IJkysuqnmbSwH3g32TgqE+VO+8ZZPNjG9foScv6WV79YDUAYBA==', 'title': 'San Diego, CA Weather Conditions | Weather Underground', 'type': 'web_search_result_location', 'url': 'https://www.wunderground.com/weather/us/ca/san-diego'}], 'text': 'Today (Saturday, June 21st) has a high of 67°F', 'type': 'text'}, {'citations': None, 'text': ' with ', 'type': 'text'}, {'citations': [{'cited_text': '/ 0.00 °in Cloudy early with partial sunshine expected late. ', 'encrypted_index': 'Eo8BCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDB4nMEZc/F7OchMulRoMGN8vERmCYSPIeM52IjBEWjKA8pyazlviIcAv3VdKXXstJzWI89Lth9GVQTgJe+aHBo6Z9RixGwe9H65I4iEqE6r+cdWvSki3A5y7liT1a2+EuPgYBA==', 'title': 'San Diego, CA Weather Conditions | Weather Underground', 'type': 'web_search_result_location', 'url': 'https://www.wunderground.com/weather/us/ca/san-diego'}], 'text': 'cloudy conditions early with partial sunshine expected later', 'type': 'text'}, {'citations': None, 'text': '. ', 'type': 'text'}, {'citations': [{'cited_text': 'Winds SSW at 10 to 15 mph. ', 'encrypted_index': 'Eo8BCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDB45Fg4fI2lZagCjPRoM44KF0iEojWBopwrHIjBhn7dgVM1Ff/cqtJ/lTjfQ/jwVGUPTMJqvlWxrNi2vlcn6nHSZw+cUefs/Ruz/GNgqE6jMHyEpfOkI5cEy1xxL1qwAZvIYBA==', 'title': 'San Diego, CA Weather Conditions | Weather Underground', 'type': 'web_search_result_location', 'url': 'https://www.wunderground.com/weather/us/ca/san-diego'}], 'text': 'Winds are from the SSW at 10 to 15 mph', 'type': 'text'}, {'citations': None, 'text': '.\n\n', 'type': 'text'}, {'citations': [{'cited_text': 'Low 62F. Winds SSW at 10 to 15 mph. ', 'encrypted_index': 'EpEBCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDGs1z0BKFApU+3H2sxoMHemxpcDkrIGd4oSRIjAWWpByOKdjFHplptGY/sqWHuZVPAxLushiCw0j+aLQ3+bpwzSikTDw6Eb075la0fYqFeOQNDFP6pV830agKs390gtIQ9hn2RgE', 'title': 'San Diego, CA Weather Conditions | Weather Underground', 'type': 'web_search_result_location', 'url': 'https://www.wunderground.com/weather/us/ca/san-diego'}], 'text': "Tonight's low will be around 62°F with overcast conditions and SSW winds at 10 to 15 mph", 'type': 'text'}, {'citations': None, 'text': '.\n\n', 'type': 'text'}, {'citations': [{'cited_text': 'Cooler today with highs around 4-7 degrees below normal for most areas, still slightly above normal in the lower deserts. ', 'encrypted_index': 'Eo8BCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDKmS4xmv51SRhiupjBoM1jB2H6k2FU08pQ3GIjAV+DJ6rRuV2b6Q7ignq8PgwpnBySIrcI0FjJyUkxWXMUqYQYSPaTtiNLaSUJi1kh4qE+SXxbI2WryAsUjDE9uQS3F/91QYBA==', 'title': 'San Diego, CA', 'type': 'web_search_result_location', 'url': 'https://www.weather.gov/sgx/'}], 'text': 'Temperatures are running about 4-7 degrees below normal for most areas', 'type': 'text'}, {'citations': None, 'text': ', making it a cooler day than typical for this time of year in San Diego.\n\n', 'type': 'text'}, {'citations': [{'cited_text': 'The air has reached a high level of pollution and is unhealthy for sensitive groups. Reduce time spent outside if you are feeling symptoms such as dif...', 'encrypted_index': 'EpEBCioIBBgCIiQ4ODk4YTFkYy0yMTNkLTRhNmYtOTljYi03ZTBlNTUzZDc0NWISDK8D4vc8KfCrlx9emxoMMLnROCL/VkErH3i/IjA/9/wpz9prNlBSXXcsTY2S+xdsPRDTNhPl7sYwMQoZ1OAvK8zbv5m0QT4Z0rVOkO8qFX/4Kq1l4tkCVlYlPmm9TE6ED9r0ABgE', 'title': 'San Diego, CA Weather Forecast | AccuWeather', 'type': 'web_search_result_location', 'url': 'https://www.accuweather.com/en/us/san-diego/92101/weather-forecast/347628'}], 'text': 'Air quality is currently at an unhealthy level for sensitive groups, so those with breathing sensitivities should reduce outdoor time if experiencing symptoms', 'type': 'text'}, {'citations': None, 'text': '.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 7302, 'output_tokens': 325, 'server_tool_use': {'web_search_requests': 1}, 'service_tier': 'standard'}

The search_conf() function creates the necessary configuration for the web search tool. You can customize it with several parameters:

search_conf(
    max_uses=None,               # Maximum number of searches Claude can perform
    allowed_domains=None,        # List of domains to search within (e.g., ['wikipedia.org'])
    blocked_domains=None,        # List of domains to exclude (e.g., ['twitter.com'])
    user_location=None           # Location context for search
)

When Claude uses the web search tool, the response includes citations linking to the source information. Claudette automatically formats these citations and provides them as footnotes in the response.

Web search usage is tracked separately from normal token usage in the usage statistics:

chat.use

In: 7302; Out: 325; Cache create: 0; Cache read: 0; Total Tokens: 7627; Search: 1

Web search requests have their own pricing. As of May 2024, web searches cost $10 per 1,000 requests.

Text Editor Tool

Claudette provides support for Anthropic’s special Text Editor Tool, which allows Claude to view and modify files directly. Unlike regular function-calling tools, the text editor tool uses a predefined schema built into Claude’s model.

Important notes about the text editor tool:

• It’s schema-less - you provide a configuration but not a schema
• It uses type identifiers like “text_editor_20250124” specific to Claude models
• You must implement a dispatcher function (in Claudette, it’s str_replace_based_edit_tool)
• Different commands route through this single dispatcher function

The text editor tool allows Claude to:

• View file or directory contents
• Create new files
• Insert text at specific line numbers
• Replace text within files

from claudette.text_editor import text_editor_conf, str_replace_based_edit_tool
from toolslm.funccall import mk_ns

# Create a chat with the text editor tool
chat = Chat(model, sp='Be concise in your responses.',
            tools=[text_editor_conf['sonnet']], ns=mk_ns(str_replace_based_edit_tool))

# Now Claude can explore files
for o in chat.toolloop('Please explain concisely what my _quarto.yml does. Use your tools, and explain before each usage what you are doing.'):
    if not isinstance(o,dict): display(o)

I’ll examine your _quarto.yml file to explain what it does. Let me start by looking at the current directory to locate the file.

• id: msg_01S59jijaZGLN9jq525KoDRu
• content: [{'citations': None, 'text': "I'll examine your _quarto.yml file to explain what it does. Let me start by looking at the current directory to locate the file.", 'type': 'text'}, {'id': 'toolu_01NxKxWNHFroLYxTULzFnBAp', 'input': {'command': 'view', 'path': '.'}, 'name': 'str_replace_based_edit_tool', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 1120, 'output_tokens': 106, 'server_tool_use': None, 'service_tier': 'standard'}

Now I can see the _quarto.yml file exists. Let me examine its contents to understand what it configures.

• id: msg_015w8s5yw4RBs4dXgfLx2CDS
• content: [{'citations': None, 'text': 'Now I can see the _quarto.yml file exists. Let me examine its contents to understand what it configures.', 'type': 'text'}, {'id': 'toolu_01ToUv8CSQH69Kx2ahBSwcGf', 'input': {'command': 'view', 'path': '/_Users/jhoward/aai-ws/claudette/_quarto.yml'}, 'name': 'str_replace_based_edit_tool', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 2738, 'output_tokens': 120, 'server_tool_use': None, 'service_tier': 'standard'}

Let me use the correct path:

• id: msg_01Baaa1otgra5CHimvP9Ja5s
• content: [{'citations': None, 'text': 'Let me use the correct path:', 'type': 'text'}, {'id': 'toolu_01FTCbeJLRdAyfqqnq3pAQFa', 'input': {'command': 'view', 'path': '/Users/jhoward/aai-ws/claudette/_quarto.yml'}, 'name': 'str_replace_based_edit_tool', 'type': 'tool_use'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: tool_use
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 2896, 'output_tokens': 102, 'server_tool_use': None, 'service_tier': 'standard'}

Your _quarto.yml file configures a Quarto website project with the following key settings:

Project Configuration: - Sets up a website project type - Includes all .txt files as resources - Configures preview server on port 3000 without auto-opening browser

HTML Formatting: - Uses the “cosmo” theme with custom CSS from styles.css - Enables table of contents, code tools, and syntax highlighting - Sets a custom layout with wider body (1800px) and narrower sidebar (180px) - Uses “arrow” highlight style with custom code block styling - Keeps markdown files during rendering

Website Features: - Enables social media cards (Twitter and Open Graph) - Adds a search-enabled navbar with primary background - Uses a floating sidebar style - Links to GitHub issues via repo-actions

Metadata Sources: - Pulls additional configuration from nbdev.yml and sidebar.yml files

This appears to be set up for a documentation website, likely for a Python package using nbdev (given the nbdev.yml reference), with a focus on displaying code and technical content with good readability and navigation.

• id: msg_01Ba23FNyw6xy7KdtTVnBdk6
• content: [{'citations': None, 'text': 'Your_quarto.ymlfile configures a Quarto website project with the following key settings:\n\n**Project Configuration:**\n- Sets up a website project type\n- Includes all.txtfiles as resources\n- Configures preview server on port 3000 without auto-opening browser\n\n**HTML Formatting:**\n- Uses the "cosmo" theme with custom CSS fromstyles.css\n- Enables table of contents, code tools, and syntax highlighting\n- Sets a custom layout with wider body (1800px) and narrower sidebar (180px)\n- Uses "arrow" highlight style with custom code block styling\n- Keeps markdown files during rendering\n\n**Website Features:**\n- Enables social media cards (Twitter and Open Graph)\n- Adds a search-enabled navbar with primary background\n- Uses a floating sidebar style\n- Links to GitHub issues via repo-actions\n\n**Metadata Sources:**\n- Pulls additional configuration fromnbdev.ymlandsidebar.ymlfiles\n\nThis appears to be set up for a documentation website, likely for a Python package using nbdev (given the nbdev.yml reference), with a focus on displaying code and technical content with good readability and navigation.', 'type': 'text'}]
• model: claude-sonnet-4-20250514
• role: assistant
• stop_reason: end_turn
• stop_sequence: None
• type: message
• usage: {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 3235, 'output_tokens': 267, 'server_tool_use': None, 'service_tier': 'standard'}

chat.use

In: 9989; Out: 595; Cache create: 0; Cache read: 0; Total Tokens: 10584; Search: 0

Other model providers

You can also use 3rd party providers of Anthropic models, as shown here.

Amazon Bedrock

These are the models available through Bedrock:

models_aws

['anthropic.claude-sonnet-4-20250514-v1:0',
 'claude-3-5-haiku-20241022',
 'claude-3-7-sonnet-20250219',
 'anthropic.claude-3-opus-20240229-v1:0',
 'anthropic.claude-3-5-sonnet-20241022-v2:0']

To use them, call AnthropicBedrock with your access details, and pass that to Client:

from anthropic import AnthropicBedrock

ab = AnthropicBedrock(
    aws_access_key=os.environ['AWS_ACCESS_KEY'],
    aws_secret_key=os.environ['AWS_SECRET_KEY'],
)
client = Client(models_aws[-1], ab)

Now create your Chat object passing this client to the cli parameter – and from then on, everything is identical to the previous examples.

chat = Chat(cli=client)
chat("I'm Jeremy")

Google Vertex

These are the models available through Vertex:

models_goog

To use them, call AnthropicVertex with your access details, and pass that to Client:

from anthropic import AnthropicVertex
import google.auth

# project_id = google.auth.default()[1]
# gv = AnthropicVertex(project_id=project_id, region="us-east5")
# client = Client(models_goog[-1], gv)

chat = Chat(cli=client)
chat("I'm Jeremy")

Extensions

• Pydantic Structured Ouput

Footnotes

1. https://www.wunderground.com/weather/us/ca/san-diego “TomorrowSat 06/21 High · 67 °F · 14% Precip.”

2. https://www.wunderground.com/weather/us/ca/san-diego “High 67F.”

3. https://www.wunderground.com/weather/us/ca/san-diego “/ 0.00 °in Cloudy early with partial sunshine expected late.”

4. https://www.wunderground.com/weather/us/ca/san-diego “Winds SSW at 10 to 15 mph.”

5. https://www.wunderground.com/weather/us/ca/san-diego “Low 62F. Winds SSW at 10 to 15 mph.”

6. https://www.weather.gov/sgx/ “Cooler today with highs around 4-7 degrees below normal for most areas, still slightly above normal in the lower deserts.”

7. https://www.accuweather.com/en/us/san-diego/92101/weather-forecast/347628 “The air has reached a high level of pollution and is unhealthy for sensitive groups. Reduce time spent outside if you are feeling symptoms such as dif…”