Simon Willison’s Weblog

2nd September 2026

Release llm-anthropic 0.28 — LLM access to models by Anthropic, including the Claude series

Claude Fable 5.1, reasoning traces are now displayed by default for models that support them, plus a new llm_anthropic.ClaudeRefusal exception for when Claude throws a refusal.

Posted 2nd September 2026 at 5:59 pm

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This is a beat by Simon Willison, posted on 2nd September 2026.

llm 646 anthropic 352 claude 323 claude-mythos-fable 43

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