Simon Willison's WeblogMay 28, 2026, 11:54 PM

llm-anthropic 0.25.1

llm-anthropic 0.25.1 adds Claude Opus 4.8, fast mode support, and updated max_tokens defaults.

Simon Willison released llm-anthropic 0.25.1 with support for the new Claude Opus 4.8 model, exposed as claude-opus-4.8. The release adds a -o fast 1 option for Anthropic fast mode, limited to organizations that have the feature enabled. It also changes default max_tokens behavior so each model now defaults to its maximum output instead of 8,192.

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