llm-anthropic 0.29

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[ARTICLE · art-137744] src=simonwillison.net ↗ pub=2026-09-22T17:14Z topic=ai-products verified=true sentiment=· neutral

llm-anthropic 0.29

Simon Willison released llm-anthropic 0.29 on 22nd September 2026, adding support for Anthropic's Claude Opus 5.5 model to the LLM command-line tool. The update lets users run prompts against the new model with the command "llm -m claude-opus-5.5". The release follows the same-day launch of Claude Opus 5.5 alongside GPT-6 Sol, GPT-6 Luna and a new price war.

read1 min views30 publishedSep 22, 2026

22nd September 2026

Adds support for Claude Opus 5.5:

llm -m claude-opus-5.5 "prompt goes here"

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llm-anthropic 0.29

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