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Large Language ModelsAI Business & IndustrySimon Willison's WeblogPublished: May 29, 2026, 10:00 JST1 min read

llm-anthropic releases version 0.25.1 with Claude Opus 4.8 support and new fast mode option

3 Key Points

  1. Anthropic's Claude Opus 4.8 model is now available through the llm-anthropic tool, alongside a new -o fast 1 option for organizations with that feature enabled on their account.

  2. Default max_tokens for each model now defaults to that model's maximum output rather than 8,192, changing how much text each model can generate by default.

  3. The llm-anthropic tool was used to generate content related to pelicans, demonstrating the capabilities of the Opus 4.8 release.

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