No game engine.

No artists.

No image files.

Just one prompt, and Claude Opus 5.5 built a full 3D world.

We asked for a bioluminescent underwater cathedral.

Jellyfish.

Light ribbons shaped like whale song.

Floating particles.

About 9 minutes later, it was done, and Claude had tested it in the browser itself.

Here’s what’s making this possible:

→ Opus 5.5 launched Sept 22, the first model in the Claude 5.5 family
→ Anthropic says it performs at Fable 5.1’s level on most work
→ It needs less compute and writes over 30% faster than Opus 5
→ Five-hour usage limits went up on Pro, Max and Team plans
→ The whole world is Three.js in one HTML file, so it opens right in your browser

The first version already looked beautiful.

Versions two and three are where it really comes alive. 🌊

Save this video, you’ll build your first 3D world this week.

Want the SOP? DM me.