{
  "id": 152667,
  "title": "llm-anthropic 0.26",
  "url": "https://urgent.news/2026/08/04/llm-anthropic-0-26",
  "topic": "ai",
  "section": "AI",
  "published": "2026-08-04T22:00:58.000Z",
  "source": {
    "name": "Simon Willison",
    "slug": "simon-willison",
    "url": "https://simonwillison.net/2026/Aug/4/llm-anthropic/"
  },
  "original_language": "en",
  "account": "Anthropic has released a new version of their language models, with the release number 0.26. The updated models include claude-fable-5, claude-sonnet-5, and claude-opus-5. In addition, server-side tools such as WebSearch, WebFetch, CodeExecution, and AnthropicMCP have been added. These tools are now accessible through the LLM's -T interface or via the Python tools= parameter. The previous -o web_search* options have been replaced with the -T WebSearch option. The current version of the LLM has been upgraded to 0.32.\n\nAnthropic has made several changes to improve the user experience. Reasoning, tool calls, tool results, and server-side tool results now stream as typed events. This allows for real-time feedback and interaction with the models. Additionally, reasoning for llm CLI prompts is now displayed on standard error, unless the --hide-reasoning/-R flag is used. This gives users more control over what information is displayed.\n\nThe extended thinking feature has been simplified, now referred to as \"thinking\" and \"thinking_effort\" with options of low, medium, high, xhigh, or max. By default, Claude 5 models engage in thinking. However, for Sonnet 5 and Opus 5, this can be disabled using the -o thinking 0 option. Fable 5 models always think by default. The --hide-reasoning/-R flag now omits reasoning from responses and logs, providing a cleaner output. Finally, the thinking_budget, thinking_display, and thinking_adaptive options have been removed.",
  "summary": "Release: llm-anthropic 0.26 Includes new features enabled by LLM 0.32 : New models: claude-fable-5 , claude-sonnet-5 , and claude-opus-5 . #75 , #76 Added server-side tools for WebSearch , WebFetch , CodeExecution , and AnthropicMCP , available through LLM's -T interface or Python tools= . The previous -o web_search* options have been removed in favor of -T WebSearch . #79 Upgraded to llm>=0.32 .…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}