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[ARTICLE · art-109219] src=simonwillison.net ↗ pub= topic=developer-tools verified=true sentiment=· neutral

llm-anthropic 0.27

Simon Willison released llm-anthropic 0.27, an Anthropic plugin for LLM, to ensure compatibility with the anthropic v1.0.0 Python library, which switched from httpx to httpx2. The update was prompted by Anthropic's migration guide and implemented via a pull request generated by Claude Code's Fable 5 model.

read1 min views1 publishedAug 24, 2026

Release: llm-anthropic 0.27 This release of the Anthropic plugin for LLM mainly provides compatibility with the recently released anthropic v1.0.0 Python library, which switches from httpx

to httpx2. OpenAI made the same change in their v3.0.0 release two weeks ago. Anthropic provide this migration guide 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.

source & further reading
simonwillison.net — original article Quoting Drew Breunig Software Engineering in the Agentic Era llm 0.33
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