Opus

Satoshi Nakamoto I

When it comes to making things, or doing most things in general, Fable 5.1 and especially GPT-6 Astra raised my ambition level.

On September 22, 2026, Anthropic released "Claude Opus 5.5".Looking at reports in the Japanese-speaking world, both major IT media and personal blogs have largely stopped at summarizing the announcement:"Performance comparable to the higher-end Fable 5.1

Took a 200-year-old French map of Istanbul and made it interactiveEvery label shown on the map in French, Ottoman and modern Turkish, with English translationsBy far the most satisfying thing I've built with AI. Used Opus 5.5 https://t.co/EZj3sQVnbV

A 2.5D multiplane parallax scene created by echo, Opus 5.5, and Grok 4.6. Explore six painted movements with music, interactive camera controls, and fullscreen viewing.

Opus 5.5 and GPT-6 Sol cost about half as much per task.

See 10 real projects built with Claude Opus 5.5 by real users to test it, from playable games to 3D animations and interactive tools.

Claude Opus 5.5 costs less than Opus 5, but four breaking changes to thinking, tool use and computer use can trigger 400 errors in existing AI agents.