LLM-Anthropic 0.27 Compatible with Anthropic v1.0.0 and HTTPX2
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Simon Willison reports having obtained a pull request via Fable 5 in Claude Code. The update to the llm-anthropic plugin aims for compatibility with anthropic v1.0.0, which adopts httpx2. OpenAI made the same transition in its v3.0.0 two weeks ago.
A PR from a Claude Code session with Fable 5
Simon Willison indicates that he asked Fable 5 in Claude Code to perform three actions: update to anthropic>=1, read the migration guide for Anthropic 1.0, and run the tests. He reports that a pull request was produced as a result of this session. The article is authored by Simon Willison and dated August 24, 2026.
Compatibility v1.0.0 and the switch from httpx to httpx2
The llm-anthropic 0.27 version of the plugin for LLM primarily provides compatibility with the Python library anthropic v1.0.0. This recently released version replaces httpx with httpx2. Anthropic provides a migration guide to version 1.0. OpenAI made the same switch in its v3.0.0 two weeks ago.
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