{"slug": "llm-anthropic-0-29", "title": "llm-anthropic 0.29", "summary": "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.", "body_md": "22nd September 2026\n\nAdds support for [Claude Opus 5.5](https://www.anthropic.com/claude-opus-5-5):\n\n```\nllm -m claude-opus-5.5 \"prompt goes here\"\n```\n\n## Recent articles\n\n- [Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war](https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna/) - 22nd September 2026\n- [Jev introduces a new shape of LLM - System One, aka Decision Models](https://simonwillison.net/2026/Sep/21/jev/) - 21st September 2026\n- [Generating running routes with GPT-6 Astra and ChatGPT Work](https://simonwillison.net/2026/Sep/12/astra-running-routes/) - 12th September 2026", "url": "https://wpnews.pro/news/llm-anthropic-0-29", "canonical_source": "https://simonwillison.net/2026/Sep/22/llm-anthropic/", "published_at": "2026-09-22 17:14:55+00:00", "updated_at": "2026-09-23 03:22:36.889834+00:00", "lang": "en", "topics": ["ai-products", "ai-tools", "large-language-models", "developer-tools"], "entities": ["llm-anthropic", "Anthropic", "Claude Opus 5.5", "Simon Willison", "GPT-6 Sol", "GPT-6 Luna"], "alternates": {"html": "https://wpnews.pro/news/llm-anthropic-0-29", "markdown": "https://wpnews.pro/news/llm-anthropic-0-29.md", "text": "https://wpnews.pro/news/llm-anthropic-0-29.txt", "jsonld": "https://wpnews.pro/news/llm-anthropic-0-29.jsonld"}}