Claude Opus 5.5 isn't marketed as a 3D model.

People are using it to build 3D worlds anyway: Blender scenes from pure Python, Three.js racers with procedural assets, whole game prototypes from a single prompt.

Here's the workflow that actually works, and where it still breaks:

WHY IT WORKS
It doesn't "draw" 3D. It writes code that builds 3D: Blender Python, Three.js, procedural meshes. Code is where these models are strongest, and Opus 5.5 is #1 on WebDev Arena (~1810 as of Oct 27).

THE WORKFLOW
1. References first. Make front, side and back reference images with an image model.
2. Ask for a build script, not a mesh: "Write a Blender Python script that builds this from primitives, with named parts and real-world scale."
3. Render it, screenshot it, feed the screenshot back: "Compare this to the reference. List the 5 biggest differences. Fix them."
4. Loop that 4–6 times. Most of the quality comes from the critique loop, not from the first prompt.
5. Export to glTF and drop it into Three.js, Godot or Unity.

WHAT PEOPLE ARE SHIPPING (community demos)
→ A procedural Falcon 9 model and short film in Blender, from ~10,000 lines of Python
→ A Three.js kart racer with procedurally generated assets
→ An atlas of all 55 cities from Calvino's "Invisible Cities," one-shot in ~1h25m for ~$74 of API tokens

WHERE IT BREAKS
→ Organic shapes (faces, hands, creatures) still come out blocky. Use it for blockouts there.
→ It's #2 on Design Arena's 3D leaderboard, behind GPT-6 Astra (max). Anyone telling you it's #1 at 3D is wrong.
→ One-shots are prototypes, not production assets.

THE PRICE
$4 in / $20 out per million tokens. That's 20% cheaper than Opus 5, with a 1M-token context, so the whole scene script plus your references fit in one conversation.

UPDATE (NOV 9)
Anthropic just shipped Claude Fable 5.2, and CAD is where it jumps most: 83.5 on BenchCAD 2.1 (hardware engineering) vs 65.3 for Opus 5.5. It costs $8 in / $40 out, so use Opus 5.5 for the critique loop and Fable 5.2 for the hard parts.

For hard-surface props, low-poly worlds and stylized games, this is already good enough to ship.

What's the first thing you'd build if 3D assets were basically free?