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llm-anthropic 0.27: Compatibility Patch for the New anthropic v1.0.0 SDK

2026-08-25 ยท source:

llm-anthropic 0.27 updates Simon Willison's Anthropic plugin for LLM to work with anthropic v1.0.0, which switched its HTTP client from httpx to httpx2.

What it is

llm-anthropic is the Anthropic provider plugin for Simon Willison's llm CLI and Python tool.

What it does

Version 0.27 mainly restores compatibility after anthropic-sdk-python v1.0.0 dropped httpx for httpx2, the same underlying change that forced OpenAI's Python library and, in turn, llm 0.33 to update.

Why it matters

httpx2 is turning into a quiet ecosystem-wide dependency bump: any tool built on the OpenAI or Anthropic Python SDKs needs a matching release or it breaks on fresh installs.

How to use it

Update the plugin with `llm install -U llm-anthropic` to pick up compatibility with the new SDK.

Go to source →
llmanthropic-sdkhttpx2python