llm-anthropic 0.25.1
Release of llm-anthropic 0.25.1 adds support for Claude Opus 4.8, fast mode option for eligible accounts, and changes default max_tokens to each model's maximum output.
Article intelligence
Key points
- New model: Claude Opus 4.8 (claude-opus-4.8).
- New -o fast 1 option for fast mode (for organizations with feature enabled).
- Default max_tokens now defaults to each model's maximum output instead of 8,192.
Why it matters
This matters because new model: Claude Opus 4.8 (claude-opus-4.8).
Technical impact
May affect model selection, inference cost, product capability, and evaluation benchmarks.
Release: llm-anthropic 0.25.1
Simon Willison’s Weblog
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28th May 2026
Release
llm-anthropic 0.25.1 — LLM access to models by Anthropic, including the Claude series
New model: Claude Opus 4.8 (claude-opus-4.8).
New -o fast 1 option for 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
See also my notes on Opus 4.8 - I used this new release of llm-anthropic to generate the pelicans.
Recent articles
Claude Opus 4.8: "a modest but tangible improvement" - 28th May 2026
I think Anthropic and OpenAI have found product-market fit - 27th May 2026
Notes on Pope Leo XIV's encyclical on AI - 25th May 2026
This is a beat by Simon Willison, posted on 28th May 2026.
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