llm-anthropic 0.27

Simon Willison's Blog Tools
tool-release anthropic llm python compatibility-update migration

Summary

llm-anthropic version 0.27 has been released to provide compatibility with the anthropic v1.0.0 Python library. This update involves switching from httpx to httpx2, and was aided by using Claude Code for the migration process.

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Cached at: 08/24/26, 08:29 PM

# Release: llm-anthropic 0.27 Source: [https://simonwillison.net/2026/Aug/24/llm-anthropic/](https://simonwillison.net/2026/Aug/24/llm-anthropic/) This release of the Anthropic plugin for[LLM](https://llm.datasette.io/)mainly provides compatibility with the recently released[anthropic v1\.0\.0](https://github.com/anthropics/anthropic-sdk-python/releases/tag/v1.0.0)Python library, which switches from`httpx`to[httpx2](https://github.com/pydantic/httpx2)\. OpenAI made the same change in their[v3\.0\.0 release](https://github.com/openai/openai-python/releases/tag/v3.0.0)two weeks ago\. Anthropic provide this[migration guide](https://github.com/anthropics/anthropic-sdk-python/blob/v1.0.0/MIGRATION.md)for upgrading to 1\.0, so I prompted Fable 5 in Claude Code with: > `Upgrade to anthropic\>=1 \- read https://raw\.githubusercontent\.com/anthropics/anthropic\-sdk\-python/refs/heads/main/MIGRATION\.md and get the tests passing` Here's[the resulting PR](https://github.com/simonw/llm-anthropic/pull/84)\.

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