Kimi K3.1 Pro vs Opus 5.5 vs GPT-6.1 Sol, same prompts
Moonshot released Kimi K3.1 Pro on October 23, 2026 (open weights promised by November 4). We gave it, word for word, the eight prompts that Claude Opus 5.5 and GPT-6.1 Sol got on October 12 and Claude Fable 5.1, Opus 5.5 and GLM 5.3 Flash got on October 17. One request per build, no agent, no second try. The rivals' builds are the ones from those days, unchanged. Cards that needed a fix say so. Everything runs in your browser.
Every Frame: a whole life in 60 seconds
A paper-cut animated short drawn on one canvas, eight life stages, a WebAudio piano score.
Fixed (one rename): two functions were both called frame(), the animation loop overwrote the picture-frame helper and the film froze on the baby scene. Original: life-kimi-original.html.
No fixes. The most colourful: hills, a puppy, a bench, an armchair at night.
No fixes. A framed storybook with captions under each scene.
A voxel castle school for young wizards
Great hall, seven towers, covered bridge, harbour, day/night slider, free-fly and cinematic camera.
No fixes. Castle, covered bridge and greenhouse on a lake; lanterns and fireflies at night.
No fixes. Snowy mountains, a round lake with boats, the biggest landscape.
No fixes. Soft fog, an island castle, the most polished interface.
The Last Lighthouse: a 75-second short film
Storm at sea, a lighthouse beam, a fishing boat, dawn; title cards and a WebAudio score.
No fixes. Illustrated look, the keeper in the lamp room, a warm dawn ending.
Fixed (one line) in video-24: a unary minus before ** stopped the script. Original: film-opus-original.html.
No fixes. Low-poly sea, rocks and a 3D boat.
A 3D showroom for an electric SUV
The car modelled in code: paint swatches, doors and tailgate, lights, wheels, night city, turntable.
No fixes. Bright studio, every control works, but the opened tailgate floats in the air above the car.
No fixes. Dark studio with a spotlight and a reflective floor.
No fixes. A clean brand-style configurator.
A coastal sunset driving game
Endless cliff road, drifting, traffic, a speedometer, a crash and restart flow, engine sound.
No fixes. Sunset over the sea, guard rails, a speed dial and a WRECKED screen.
Fixed (one line) in video-24: a constant had the same name as the main loop. Original: drive-opus-original.html.
No fixes. Low-poly cliffs and an end-of-the-road screen.
A browser music studio
16-step sequencer, drums and three synths, knobs, oscilloscope, spectrum, and a Generate song button.
No fixes. Every track with its own knobs; three moods that change the tempo and the pattern.
No fixes. Compact grid with a big oscilloscope and spectrum.
No fixes. Each generated song gets a title.
KAZE BLOCKS: a Japanese voxel sandbox
The one-sentence 'Claude Next' prompt from video-32, plus an autopilot. Click to play, G for autopilot.
No fixes. A torii path to a shrine, cherry trees, a pond; autopilot walks and builds.
No fixes. A huge world of bamboo and cherry forests.
No fixes. Torii gates and a shrine in a cherry forest.
Fixed (one line) in video-32: a space inside a variable name.
Floating sky islands at golden hour
Five islands, rope bridges, a village, a waterfall, a windmill, a temple, a hot-air balloon, a night button.
No fixes. The densest islands: village, windmill, a waterfall into the clouds, lit windows at night.
No fixes. A big sun, many birds and a balloon.
No fixes. Clear layout with long rope bridges.
Fixed (one line) in video-32: a no-op line the model itself marked threw an error.
Time and cost per build
One request each through OpenRouter, cost as billed. Kimi K3.1 Pro at reasoning effort medium, Opus 5.5 low, Sol medium, Fable 5.1 and GLM 5.3 Flash low. Per million tokens: Kimi $2 / $10, Sol $2 / $10, Opus $4 / $20, Fable $10 / $50, GLM $0.15 / $0.50.
| Model | Build | Time | Cost | Fixes |
|---|---|---|---|---|
| Kimi K3.1 Pro | Every Frame | 6.7 min | $0.178 | 1 |
| Claude Opus 5.5 | Every Frame | 3.0 min | $0.375 | - |
| GPT-6.1 Sol | Every Frame | 4.2 min | $0.126 | - |
| Kimi K3.1 Pro | A voxel castle school for young wizards | 8.7 min | $0.230 | - |
| Claude Opus 5.5 | A voxel castle school for young wizards | 1.6 min | $0.227 | - |
| GPT-6.1 Sol | A voxel castle school for young wizards | 6.4 min | $0.177 | - |
| Kimi K3.1 Pro | The Last Lighthouse | 6.7 min | $0.174 | - |
| Claude Opus 5.5 | The Last Lighthouse | 7.1 min | $0.859 | 1 |
| GPT-6.1 Sol | The Last Lighthouse | 3.8 min | $0.108 | - |
| Kimi K3.1 Pro | A 3D showroom for an electric SUV | 7.1 min | $0.195 | - |
| Claude Opus 5.5 | A 3D showroom for an electric SUV | 2.1 min | $0.308 | - |
| GPT-6.1 Sol | A 3D showroom for an electric SUV | 4.5 min | $0.151 | - |
| Kimi K3.1 Pro | A coastal sunset driving game | 10.5 min | $0.278 | - |
| Claude Opus 5.5 | A coastal sunset driving game | 6.0 min | $0.773 | 1 |
| GPT-6.1 Sol | A coastal sunset driving game | 4.0 min | $0.112 | - |
| Kimi K3.1 Pro | A browser music studio | 7.3 min | $0.202 | - |
| Claude Opus 5.5 | A browser music studio | 1.0 min | $0.155 | - |
| GPT-6.1 Sol | A browser music studio | 3.4 min | $0.097 | - |
| Kimi K3.1 Pro | KAZE BLOCKS | 10.8 min | $0.281 | - |
| Claude Fable 5.1 | KAZE BLOCKS | 4.8 min | $1.331 | - |
| Claude Opus 5.5 | KAZE BLOCKS | 1.1 min | $0.173 | - |
| GLM 5.3 Flash | KAZE BLOCKS | 3.2 min | $0.011 | 1 |
| Kimi K3.1 Pro | Floating sky islands at golden hour | 5.5 min | $0.154 | - |
| Claude Fable 5.1 | Floating sky islands at golden hour | 3.6 min | $1.005 | - |
| Claude Opus 5.5 | Floating sky islands at golden hour | 1.6 min | $0.224 | - |
| GLM 5.3 Flash | Floating sky islands at golden hour | 7.8 min | $0.025 | 1 |
| Kimi K3.1 Pro | 8 builds | $1.69 | 1 | |
| Claude Opus 5.5 | 8 builds | $3.09 | 2 | |
| GPT-6.1 Sol | 6 builds | $0.77 | - | |
| Claude Fable 5.1 | 2 builds | $2.34 | - | |
| GLM 5.3 Flash | 2 builds | $0.04 | 2 |
The exact prompts are for Ruocco Academy members. The Academy is not open yet: join the waiting list and you get one email when it opens. The demos on this page are free to use for everyone.
Join the waiting list