# llm-anthropic 0.28

> Source: <https://simonwillison.net/2026/Sep/2/llm-anthropic/>
> Published: 2026-09-02 17:59:32+00:00

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