chatlas

library0.18.1pypypi✓ verified 89d ago

Chatlas provides a simple and consistent interface for chatting with large language models (LLMs) from providers like OpenAI, Anthropic, Google Gemini, and others. Version 0.18.1 supports Python >=3.9 and follows a rapid release cadence. It abstracts away provider-specific details, offering a unified chat session API.

ai-ml

pip install chatlas

github ↗homepage ↗

INSTALL

IMPORT

SIG · CHATLAS

chatlas

ai-mlpythonv0.18.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

ChatOpenAI

✓ from chatlas import ChatOpenAI

ChatAnthropic

✓ from chatlas import ChatAnthropic

ChatGoogle

✓ from chatlas import ChatGoogle

Creates a chat session with OpenAI and sends a message.

import os from chatlas import ChatOpenAI chat = ChatOpenAI(model="gpt-4o-mini", api_key=os.environ.get("OPENAI_API_KEY", "")) resp = chat.chat("What is the capital of France?") print(resp)

Debug

Known issues

breakingVersion 0.18.1 changed the default model for ChatOpenAI to 'gpt-4o-mini'; previously it was 'gpt-4o'.

fix

Explicitly specify the model parameter instead of relying on defaults.

affects: >=0.18.0

gotchaThe library does not bundle dependencies for providers; you must install provider packages separately (e.g., openai, anthropic).

fix

Install the required provider package: pip install openai for ChatOpenAI.

affects: all

deprecatedThe method `chat_session` is deprecated since 0.16.0; use `chat` directly.

fix

Replace `chat.chat_session(...)` with `chat(...)`.

affects: >=0.16.0

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'openai'

Chatlas does not automatically install provider packages.

fix

Run: pip install openai

chatlas.exceptions.ValueError: 'model' must be provided

The model parameter is required but was omitted.

fix

Provide a valid model name, e.g., model="gpt-4o-mini".

AttributeError: 'ChatOpenAI' object has no attribute 'chat_session'

The `chat_session` method was removed in version 0.16.0.

fix

Use `chat.chat()` or directly call `chat("prompt")`.

Upgrade

Version history

0.18.1latest on PyPI · released May 21, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

29 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/posit-dev/chatlas ↗

homepagehttps://github.com/posit-dev/chatlas ↗