# llm-anthropic 0.29

> Source: <https://simonwillison.net/2026/Sep/22/llm-anthropic/>
> Published: 2026-09-22 17:14:55+00:00

22nd September 2026

Adds support for [Claude Opus 5.5](https://www.anthropic.com/claude-opus-5-5):

```
llm -m claude-opus-5.5 "prompt goes here"
```

## Recent articles

- [Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war](https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna/) - 22nd September 2026
- [Jev introduces a new shape of LLM - System One, aka Decision Models](https://simonwillison.net/2026/Sep/21/jev/) - 21st September 2026
- [Generating running routes with GPT-6 Astra and ChatGPT Work](https://simonwillison.net/2026/Sep/12/astra-running-routes/) - 12th September 2026