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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

The Bugged Dev

@thebuggeddev · Sep 28

A physics explainer built by Opus 5.5 that lets learners manipulate fields visually; its source is in the thebuggeddev repo.

Aurelien

@Aurelien_Gz · Sep 23

Photoreal water rendered live in a single HTML file with raw WebGL2, credited to Opus 5.5. After demand from viewers the creator open-sourced it as github.com/Aureliengmz/clearwater (496 stars at fetch time).

AndrewOnXYZ

@AndrewOnXYZ · Sep 22

Opus 5.5 ultra ran four agents for ninety minutes to produce a full piece from scratch including its own synthesized voice.

Shardul

@pracosm · Sep 25

Left running with one instruction, Opus 5.5 produced two Indian cities on tiny planets, with the Mumbai Western line, Bengaluru purple metro, NPCs and trains.

うちた

@uchita_success · Sep 26

A Japanese consultant showed presentation slides that open evidence on click and recompute when dragged, achievable by adding one block to a prompt.

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.