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llm-anthropic 0.28

Simon Willison’s Weblog Simon Willison 2 September 2026, 17:59 ● Covered by 2 sources

Simon Willison posted an LLM briefing beat for Anthropic developments. It was published on 2nd September 2026. The post updates readers with monthly counts and prompts them to subscribe for a curated email digest.

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Release: llm-anthropic 0.28 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. Tags: llm, anthropic, claude, claude-mythos-fable

Anthropic Claude Fable 5.1 llm-anthropic 0.28 Simon Willison

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TLDRocket 17 September 2026

The biggest throughline today is power—specifically, how AI systems are learning to live within the electric grid rather than treating it like an afterthought. Emerald AI, alongside Google, Nvidia, and Anthropic, formed the AI Energy Management Alliance to push utilities to treat demand-response load reductions as part of data-center planning. The pitch is bluntly practical: use grid software to unlock up to 100 gigawatts of additional data-center capacity by shifting demand temporarily, reducing reliance on backup generators even as new power generation still remains necessary.

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llm-anthropic 0.28

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