I used LongCat-2.5 through Claude Code to build this landing page from one line of brief.

The brief:

"Use Three.js to create a rocket launch animation, delivered as a single HTML file. Refer to the images in inputs/. The rocket should have a white body, a red nose cone and fins, and red and blue stripes. Include a launch tower and platform. The animation should include ignition, liftoff, and the rocket flying away with a trailing flame."

One shot. No follow-ups, no fixes. What you see attached is exactly what came out.

I picked this brief because it asks for a feeling, not a layout. The model has to make its own calls on hierarchy, type, spacing and mood, and invent the film titles, prices and membership tiers on its own.

First time using LongCat-2.5. Officially launched on November 2, it has 1.6T total parameters, with approximately 48B activated per token. It's a native multimodal model built for long-horizon agentic tasks, with stronger visual understanding and coding capabilities.

Connecting it to Claude Code took about 5 minutes. LongCat's API supports the Anthropic format, so it's one settings file with the base URL, your key and the model name. Guide: http://longcat.ai/platform/docs

Run the same prompt and show me what you get.

API: http://longcat.ai/platform/product?utm_source=e25

Next test: a 3D scene, a game, or something else?

#LongCat