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llm-anthropic 0.27

Blog · Watch/Read · (gathered 2026-08-29)

  • Simon Willison released llm-anthropic 0.27, an update to his LLM plugin, primarily to ensure compatibility with the recently released anthropic v1.0.0 Python library.
  • The anthropic v1.0.0 library, mirroring a recent change in OpenAI’s v3.0.0 release, switches its underlying HTTP client from httpx to httpx2.
  • Simon demonstrated a practical application of LLMs by using Fable 5 in Claude Code, prompted with Anthropic’s migration guide, to generate the necessary code changes and pass tests for the upgrade.