TL;DR: Anthropic released Claude Opus 5.5 on September 22, 2026. It runs more than 30% faster than Opus 5, costs about 40% less to run, and people started building with it the same day – playable games, 3D physics simulations, browser films and travel planners, mostly from a single prompt. The common thread: no specialist software like Blender or a game engine was needed.
Claude Opus 5.5 is the first model in Anthropic’s Claude 5.5 family. Input and output tokens are priced at $4 and $20 per million, about 20% below Opus 5. Below are ten real builds people shared publicly in the first two days.
10 Things People Built With Claude Opus 5.5
- A pencil sketch turned into a 3D physics sim. A drawing of a trebuchet became a working launcher simulator with real ballistics and interactive controls.
- A playable Minecraft-style game in the browser. A first-person block game with rippling water and day-night lighting, built in about 1 hour 37 minutes, running in a browser tab.
- A travel planner with a 3D globe. A 30-day trip with booking links and an interactive globe you can click through.
- A 4D view of an animal moving through time. 2D video turned into 3D Gaussians pinned in space-time for a 4D render.
- A holiday sketchbook in acrylic marker style. Trip photos turned into an interactive digital sketchbook with captions.
- Two minutes of history in sand animation. A 2D animated film with music and sound design, no Blender involved.
- A watch brand site with 3D models. A cinematic site with rendered watches and a rotatable exploded view of the movement.
- An animated pixel-art wizard. A self-contained HTML file with a particle system and a state machine, running at 60fps.
- An 80-second film made of glass tiles. A single HTML file using WebGL2 and plain JavaScript, no libraries or assets.
- A fantasy castle rendered in Blender. A 10-second procedural animation from one prompt, finished in about 35 minutes for roughly $13 in API cost.
Why This Matters
The thread running through all ten is that the specialist software is missing. Someone who cannot open Blender got a rendered castle; someone who cannot write WebGL got an 80-second film. What used to need 3D software, a physics engine or a game engine now comes from a prompt.
Keep It Honest
These are demos, chosen and posted by people impressed enough to share. Nobody posts the broken attempts. At least one build (a watch site) needed a second pass before it was right – that is the realistic picture of building with any model.
Want to Build Something Like This?
The best place to try these ideas is a hackathon. Join an AI hackathon on Reskilll, read about vibe coding with AI-first teams, or start with our starter kit.