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Anthropic· Released Sep 22

Claude Opus 5.5

First model in Anthropic's Claude 5.5 family. Positioned for agentic coding, knowledge work and long tasks; priced at $4/$20 per million input/output tokens, about 30% faster output than Opus 5, and top scores on Anthropic's behavioral alignment audit.

Warehouse management software styled like a strategy gameOct 3

Entries

Vox

@Voxyz_ai · Sep 27

A large multi-agent workflow mined the author's posts into a repo of reusable skills, burning about 12M tokens on one pass.

Hanif | AI For Productivity

@hanifproduktif · Sep 23

Opus 5.5 animated an ant colony purely with code rather than a video model, and the creator turned the process into a drop-in Claude skill others can reuse.

francozanardi

@francozanardi · Sep 26

MIT engine where an agent writes a short film as code, renders offline and inspects its own frames; most example shorts were made with Opus 5.5 at medium effort.

Claude Opus 5.5: quick answers

What can you build with Claude Opus 5.5?
People have published 201 public builds made with Claude Opus 5.5. The most common uses are animation videos (58), games (45), 3d graphics (22), design (14) and education (13).
What are the best Claude Opus 5.5 GitHub repos?
The most-starred open-source Claude Opus 5.5 projects in the index are "I'm Upping My P(doom)" music video, full source, Awesome Opus 5.5 Videos (prompt gallery) and LiveNerf: daily check for Opus 5.5 degradation.
Are there Claude Opus 5.5 demo videos?
Yes: 1 video show Claude Opus 5.5 in use, each linked to the original post.
Where do people share Claude Opus 5.5 projects?
Mostly on X, Reddit and GitHub, from 186 creators between Sep 22 and Oct 7.