Claude Opus 5.5 3D and GPT-6 Astra 3D

This lesson builds, rigs and edits 3D files from a prompt with Claude Opus 5.5 3D and GPT-6 Astra 3D.

Open the model and its settings

Go to Home, then Create, then 3D, and pick Claude Opus 5.5 3D. On the left, add Reference Images, or a 3D model under Edit a 3D Model, and write your Prompt.

Under Settings:

• Effort goes from Standard to Maximum.
• Polycount Limit caps the triangles.
• Output Format and Topology set the delivered file.

A Blender file always comes with the result.

Build from a prompt or images

Describe what you want, or send reference images. The Info panel on the right always shows the prompt and the settings behind each result.

• Opus turns one picture into a cartoon lighthouse on a tiny island.
• A vintage diving helmet, from one photo, is built from separate parts, so you can pull them apart.
• GPT-6 Astra 3D works the same way: a worn generator from one reference image, again in parts.
• Add more images for more control: the industrial facility comes from one reference, the shop from three.

Rig and animate

Both models rig and animate. They work best with long, detailed prompts.

• Opus rigged a cartoon zombie with an Unreal Engine 5 Mannequin skeleton, and added a walk cycle.
• Props too: Opus split the windmill rotor from the tower, set its pivot on the shaft and baked a turn. On the scooter, the steering and the wheels are their own parts.
• Astra made a breakable crate in 26 hollow pieces, with the physics baked into keyframes, so it breaks the same way every time.

Character and facial rigs

For characters, they build a full rig. Astra made the body and Opus added the face, for 78 bones, with three segments per finger.

The face carries the 52 standard ARKit channels, so captured expressions and lip sync can drive it.

Edit an existing 3D file

They also edit a 3D file you already have. Here, Astra takes the buggy and builds a chain of levels of detail, from the original down to about five percent of the triangles.