{"slug": "llm-anthropic-0-26", "title": "llm-anthropic 0.26", "summary": "Simon Willison released llm-anthropic 0.26, a plugin for the LLM command-line tool, adding support for Claude 5 models (claude-fable-5, claude-sonnet-5, claude-opus-5) and server-side tools including WebSearch, WebFetch, CodeExecution, and AnthropicMCP. The update requires LLM 0.32 and streams reasoning, tool calls, and results as typed events, with simplified thinking controls and a new -R/--hide-reasoning flag.", "body_md": "**Release:** [llm-anthropic 0.26](https://github.com/simonw/llm-anthropic/releases/tag/0.26)\n\nIncludes new features enabled by [LLM 0.32](https://simonwillison.net/2026/Aug/4/new-release-of-llm/):\n\n- New models:\n`claude-fable-5`\n\n,`claude-sonnet-5`\n\n, and`claude-opus-5`\n\n.[#75],[#76]- Added server-side tools for\n`WebSearch`\n\n,`WebFetch`\n\n,`CodeExecution`\n\n, and`AnthropicMCP`\n\n, available through LLM's`-T`\n\ninterface or Python`tools=`\n\n. The previous`-o web_search*`\n\noptions have been removed in favor of`-T WebSearch`\n\n.[#79]- Upgraded to\n[llm>=0.32]. Reasoning, tool calls, tool results, and server-side tool results now stream as typed events. Reasoning for`llm`\n\nCLI prompts now displays to standard error unless you pass`--hide-reasoning/-R`\n\n.- Simplified extended thinking to\n`thinking`\n\nand`thinking_effort`\n\n(`low`\n\n,`medium`\n\n,`high`\n\n,`xhigh`\n\n, or`max`\n\n). Claude 5 models think by default;`-o thinking 0`\n\ndisables thinking for Sonnet 5 and Opus 5, while Fable 5 always thinks.`-R/--hide-reasoning`\n\nnow omits reasoning from responses and logs. The`thinking_budget`\n\n,`thinking_display`\n\n, and`thinking_adaptive`\n\noptions have been removed.[#80]\n\nTags: [llm](https://simonwillison.net/tags/llm), [anthropic](https://simonwillison.net/tags/anthropic), [claude](https://simonwillison.net/tags/claude), [model-context-protocol](https://simonwillison.net/tags/model-context-protocol)", "url": "https://wpnews.pro/news/llm-anthropic-0-26", "canonical_source": "https://simonwillison.net/2026/Aug/4/llm-anthropic/#atom-everything", "published_at": "2026-08-04 22:00:58+00:00", "updated_at": "2026-08-05 00:31:03.239012+00:00", "lang": "en", "topics": ["large-language-models", "ai-tools", "developer-tools"], "entities": ["Simon Willison", "llm-anthropic", "LLM", "Anthropic", "Claude 5", "claude-fable-5", "claude-sonnet-5", "claude-opus-5"], "alternates": {"html": "https://wpnews.pro/news/llm-anthropic-0-26", "markdown": "https://wpnews.pro/news/llm-anthropic-0-26.md", "text": "https://wpnews.pro/news/llm-anthropic-0-26.txt", "jsonld": "https://wpnews.pro/news/llm-anthropic-0-26.jsonld"}}