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Large Language ModelsOpen-Source AISimon Willison's WeblogPublished: Aug 25, 2026, 06:01 JST2 min read

Anthropic LLM plugin updated for v1.0.0 library

Anthropic LLM plugin updated for v1.0.0 library

Key takeaway

  • Anthropic's LLM plugin version 0.27 now works with the anthropic v1.0.0 library. This library switched from httpx to httpx2.

  • OpenAI made a similar change two weeks ago.

  • Users should update to maintain compatibility.

3 Key Points

  1. What happened

    The Anthropic plugin for LLM was released as version 0.27, mainly to ensure compatibility with the recently released anthropic v1.0.0 Python library, which switched from httpx to httpx2.

  2. Why it matters

    This update follows OpenAI's similar change in their v3.0.0 release two weeks ago. The switch to httpx2 in the underlying library could affect how the plugin handles HTTP requests, so this compatibility update is necessary for the plugin to work correctly.

  3. What to watch

    The update was tested by prompting Fable 5 in Claude Code to read the migration guide and get tests passing, resulting in a pull request. Users of the plugin may want to check that their existing setups still work after the update.

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Context & Analysis

The release of the Anthropic plugin for LLM version 0.27 is a routine but necessary maintenance update. It ensures the plugin remains compatible with the anthropic v1.0.0 Python library, which recently changed its underlying HTTP client from httpx to httpx2. This is part of a broader trend, as OpenAI made a similar transition in their v3.0.0 release two weeks ago. Such updates are critical for developers who rely on these tools, as they prevent breakage and keep the ecosystem stable.

To ensure the upgrade was smooth, the maintainer used Claude Code to automate the process, prompting Fable 5 to read the official migration guide and make the tests pass. This resulted in a pull request that presumably includes the necessary changes. This approach highlights a growing use of AI assistants in software maintenance tasks, which could become more common as these tools improve.

For users, the key takeaway is to update their plugin to version 0.27 if they are using the anthropic library, to avoid compatibility issues. The update is focused on compatibility, not new features, so the impact is largely technical. As the underlying libraries evolve, users should stay informed about such changes to ensure their projects continue to work seamlessly.

FAQ

What changed in the Anthropic plugin update?
The plugin mainly provides compatibility with the anthropic v1.0.0 Python library, which switched from httpx to httpx2. No new features were added.
Why was the update necessary?
The underlying anthropic library changed its HTTP library, so the plugin needed to be updated to work with the new version. OpenAI made a similar change in their v3.0.0 release two weeks ago.
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