{"slug": "llm-anthropic-0-28", "title": "llm-anthropic 0.28", "summary": "Anthropic released llm-anthropic 0.28 on 2nd September 2026, which now displays reasoning traces by default for supported models and introduces a new `llm_anthropic.ClaudeRefusal` exception for when Claude throws a refusal.", "body_md": "2nd September 2026\n\n[Claude Fable 5.1](https://www.anthropic.com/claude/fable), 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.\n\n## Recent articles\n\n- [The Pelican comparison grid for Astra is pretty interesting](https://simonwillison.net/2026/Sep/4/astra-pelicans/) - 4th September 2026\n- [OpenAI's rogue agents were caught communicating via public wikis](https://simonwillison.net/2026/Sep/4/rogue-agent-wikis/) - 4th September 2026\n- [Claude's new system prompt really doesn't want to reproduce song lyrics](https://simonwillison.net/2026/Sep/2/claudes-new-system-prompt/) - 2nd September 2026", "url": "https://wpnews.pro/news/llm-anthropic-0-28", "canonical_source": "https://simonwillison.net/2026/Sep/2/llm-anthropic/", "published_at": "2026-09-02 17:59:32+00:00", "updated_at": "2026-09-08 01:31:15.863307+00:00", "lang": "en", "topics": ["developer-tools", "large-language-models"], "entities": ["Anthropic", "llm-anthropic", "Claude Fable 5.1"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/llm-anthropic-0-28", "markdown": "https://wpnews.pro/news/llm-anthropic-0-28.md", "text": "https://wpnews.pro/news/llm-anthropic-0-28.txt", "jsonld": "https://wpnews.pro/news/llm-anthropic-0-28.jsonld"}}