Simon Willison has released llm-anthropic 0.27, an update to the Anthropic plugin for his LLM command-line tool and Python library [reference:21]. The release, dated August 24, 2026, provides compatibility with the newly released anthropic v1.0.0 Python SDK, which switches its underlying HTTP client from httpx to httpx2 [reference:22][reference:23].
What's new
The update is primarily a maintenance release to keep the plugin working with the latest Anthropic SDK. The anthropic v1.0.0 library represents a significant change in the Python client's architecture, moving to a newer HTTP library. Willison's update ensures that users of the LLM tool can continue to access Anthropic's Claude models through the command line [reference:24].
About LLM
LLM is Simon Willison's command-line tool and Python library for accessing language models [reference:25]. The Anthropic plugin is one of several plugins that allow LLM to work with different model providers. The release of llm-anthropic 0.27 ensures that users can continue to use Claude models through LLM without interruption.
Significance
While the release is modest in scope — primarily a compatibility update — it reflects the ongoing maintenance and evolution of the AI tooling ecosystem. As model providers update their SDKs, tool maintainers must keep pace to ensure continued functionality for their users.