llm-anthropic 0.25.1

Simon Willison's Blog Tools
llm anthropic claude cli-tool plugin release model-update

Summary

llm-anthropic 0.25.1 adds support for Claude Opus 4.8, a fast mode option, and updates default max_tokens behavior.

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# Release: llm-anthropic 0.25.1 Source: [https://simonwillison.net/2026/May/28/llm-anthropic/](https://simonwillison.net/2026/May/28/llm-anthropic/) > - New model:[Claude Opus 4\.8](https://www.anthropic.com/news/claude-opus-4-8)\(`claude\-opus\-4\.8`\)\. - New`\-o fast 1`option for[fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode), for organizations with that feature enabled on their account\. - Default max\_tokens for each model now defaults to that model's maximum output rather than 8,192\.[\#72](https://github.com/simonw/llm-anthropic/issues/72) See also my[notes on Opus 4\.8](https://simonwillison.net/2026/May/28/claude-opus-4-8/)\- I used this new release of`llm\-anthropic`to generate the pelicans\.

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