---
title: llm-anthropic 0.29
link: https://simonwillison.net/2026/Sep/22/llm-anthropic/
source: simonwillison-net
published: 2026-09-22T17:14:55Z
updated: 2026-09-22T17:14:55Z
first_seen: 2026-09-23T00:20:14.260676283Z
labels:
- anthropic
- llm
summary: 'Release: llm-anthropic 0.29 Adds support for Claude Opus 5.5: llm -m claude-opus-5.5 "prompt goes here" Tags: llm, anthropic'
content: feed
html: 2026-09-22-llm-anthropic-0-29.html
---

**Release:** [llm-anthropic 0.29](https://github.com/simonw/llm-anthropic/releases/tag/0.29)

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

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

Tags: [llm](https://simonwillison.net/tags/llm), [anthropic](https://simonwillison.net/tags/anthropic)