llm-anthropic 0.28

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.

2nd September 2026 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. Recent articles - The Pelican comparison grid for Astra is pretty interesting https://simonwillison.net/2026/Sep/4/astra-pelicans/ - 4th September 2026 - OpenAI's rogue agents were caught communicating via public wikis https://simonwillison.net/2026/Sep/4/rogue-agent-wikis/ - 4th September 2026 - 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