OpenRouter
Fusion
Multi-model panel — Fable 5 + GPT-5.5, ensembled. Beats Fable 5 at half the price.
Official vendor source
Fusion is built by OpenRouter — see the vendor's own product page, pricing, and docs at openrouter.ai/openrouter/fusion.
Reference benchmarks for Fusion
These are external benchmarks I pulled from the source comparison guides on agentos.guide — SWE-bench Verified, DRACO, Kilo plan rubric, build-time measurements, vendor-reported coding scores. They are not goldiebench medal scores (those come only from same-prompt one-shot creative coding tasks in the matrix). I surface them here so the spec sheet for Fusion is honest about what's measured.
What is Fusion?
Fusion is the OpenRouter frontier model with a Varies — depends on which panel models are dispatched context window, released 2026-06-14. Tagline: Multi-model panel — Fable 5 + GPT-5.5, ensembled. Beats Fable 5 at half the price.. Official source: openrouter.ai/openrouter/fusion.
Pricing detail. OpenRouter's Fusion API dispatches a single prompt to multiple frontier models and ensembles the answers. Premium panel: Fable 5 + GPT-5.5. Budget panel: cheaper open-weights models. Roughly half the per-token cost of a Fable 5 solo call.
How I use it inside the Agent OS. Dispatched from Agent OS for research-heavy prompts where ensemble accuracy outweighs single-model speed.
What I built with Fusion
Every model on Goldie Bench gets the same fixed prompt set — one shot, single HTML file out — and I score the result 0–10 inside the Agent Operating System. Here's what Fusion shipped on the bench: 47 one-shot demos across Varies — depends on which panel models are dispatched of context. Of those, 47 are scored against the field with my honest 0–10 from the source guides at agentos.guide.
Strengths
- Premium Fusion panel scored 69.0% on DRACO deep-research benchmark — beats solo Fable 5 by +3.7 points
- Budget panel ties Fable 5 at ~64.7% for roughly half the cost
- Vendor-agnostic — model panel can swap as new frontier releases land
Trade-offs
- Ensemble latency higher than any single model (panel calls run in parallel but the slowest still gates the response)
- No per-task goldiebench scoring yet — bench rank pending
Best for
- Deep-research workflows where panel consensus beats single-model answers
- Cost-sensitive operators who want Fable-5-class output at ~half the bill
- Production agents that benefit from vendor-redundancy on every call
Every benchmark — Fusion's full scorecard
All 47 scored tasks, best first — the judge's 0–10 on the same rubric as the whole field. Click any bar for that task's cross-model page, or open this scorecard in the interactive graphs. Full editorial breakdown with judge quotes and sourced outside research: the Fusion deep dive →.
Every demo by Fusion
47 live demos, sorted by category. Click any tile to play the actual one-shot result. Verdicts and 0–10 scores are pulled from the source guides where I posted them publicly.
▶ LIVECrypt 🥇
Game
First-person Nordic dungeon on three.js with PointerLockControls + WebGL. Torch-lit corridors, held torch, skeletons to strike, health + gold HUD. The crypt Julian wanted.
▶ LIVEDragonrealm 🥇
Game
The Dragon Realm — Skyrim-style frozen open world with full HUD (score/vitality/stamina), snowy mountains, low-poly pine forest, a flying dragon. WASD + mouse-look. Tied with GLM's deep build at the top of the task.
▶ LIVEDoom 🥈
Game
Doom-style raycaster shooter: sprite enemies, gun with muzzle flash, ammo + health HUD. WASD + mouse-look + click to fire. 20KB of game logic.
▶ LIVERacing 🥇
Game
RETRY @ 24K tokens — now complete: 32KB three.js with rAF + 4 input handlers + closed tags. Banking turns, drift, obstacles, lap timer. The original truncated attempt has been replaced.
▶ LIVESkyrim 🥇
Game
RETRY @ 24K tokens — now complete: 25KB three.js + WebGL with rAF + 8 input handlers + closed tags. Snowy Nordic terrain, low-poly pines, rocks, rolling hills, dragon overhead, health + stamina HUD. WASD + mouse-look.
▶ LIVETwilightvale 🥇
Game
RETRY @ 24K tokens — now complete: 44KB three.js + WebGL using renderer.setAnimationLoop (three.js native loop), 6 input handlers, full update() per-frame: player + NPCs + enemies + weather + day/night + HUD. Densest build on the bench.
▶ LIVEVoxelcraft 🥇
Game
Minecraft-style voxel sandbox in 23KB. Block-based world, fly around, click-to-break, right-click-to-place, day/night cycle, block-picker hotbar. Closest to a real Minecraft any Fusion build managed.
▶ LIVEGtafoot 🥇
Game
SHOWCASE BUILD (threejs-game-director): articulated humanoid w/ walk cycle + weapon poses, 110 instanced buildings w/ lit windows, 16 neon blade signs, wet-road reflections, cops+peds AI, cohesive GTA HUD (cash/minimap/stars/weapon wheel), 71fps. Eyeball-gate passed.
▶ LIVEGtadrive 🥇
Game
SHOWCASE BUILD (threejs-game-director): beveled car bodies w/ glass + spinning wheels, sunset sky + PMREM paint reflections, 15-car lane AI + red lights + overtakes, cop pursuit, drift smoke + skids, arc speedometer + minimap HUD, 77 draw calls 71fps. Eyeball-gate passed.
▶ LIVEAipbpromo
Page
120KB · auto-plays clean (video ad, input n/a) · css timeline
▶ LIVEParachute 🥇
Game
SHOWCASE BUILD (threejs-game-director): cargo-bay interior + jump light, articulated skydiver w/ 7 pose sets, 9-cell ram-air canopy w/ lines, 11.5k instanced trees + carved river, ring-target landing scoring, analog altimeter HUD, auto-demo lands inner ring. Eyeball-gate passed.
▶ LIVEFlightsim 🥇
Game
SHOWCASE BUILD (threejs-game-director): livery aircraft w/ animated control surfaces + prop blur, real flight model (stall/ground effect/graded landings), canvas runway + PAPI + windsock airport, glass-cockpit strip (IAS/ALT tapes, horizon, heading), auto-demo. Eyeball-gate passed.
▶ LIVEArcade 🥉
Game
Neon Breakout with combo system, lives-dot indicators, floating-card overlay animation, full pill HUD. Custom cursor, mobile pointer support, particle juice. Tied with Opus on game-feel.
▶ LIVEDogfight 🥇
Game
RETRY @ 24K tokens — now complete: 36KB three.js + WebGL with 2 rAFs, 6 input handlers, full </html>. Fighter, enemies, missiles, guns, sky + ground, full HUD. The original truncated 32KB attempt has been replaced with a working build.
▶ LIVEDragonflight 🥇
Game
RETRY @ 24K tokens — now complete: 27KB three.js + WebGL with rAF + 3 input handlers + closed tags. Fly a dragon through neon rings, score + fire-breath gauge + fury meter HUD. The original truncated attempt has been replaced.
▶ LIVEGame 🥇
Game
RETRY @ 24K tokens — now complete: 30KB juicy arcade build with 2 rAFs + 9 input handlers + Web Audio + closed tags. Score HUD, lives, polish. The original truncated version has been replaced.
▶ LIVENeonblaster 🥇
Game
RETRY @ 24K tokens — now complete: 30KB with 2 rAFs + 8 input handlers + closed tags. Waves, bosses, power-ups, screen-shake, synth music (Web Audio), neon particle explosions, score HUD. The original truncated attempt has been replaced.
▶ LIVENeoncity
Game
Cyberpunk neon-city flythrough on three.js with WebGL + UnrealBloomPass. Towers, light trails, foggy depth. Drag to look around.
▶ LIVENeonracer
Game
Top-down neon racer with vapor-trail particles, synthwave aesthetic, drift physics, lap timer, procedural track. 22KB.
▶ LIVENordiccrypt 🥇
Game
RETRY @ 24K tokens — now complete: 29KB with rAF + 7 input handlers + closed tags. Torch-lit ancient ruin, PointerLockControls, bloom, chasing enemies, boss room. The original truncated attempt has been replaced with a working build.
▶ LIVEOutrun
Game
Pseudo-3D OutRun racer with curving + cresting road, synthwave horizon, parallax scenery. Arrow-key steering + accel.
▶ LIVEPool
Game
Canvas2D billiards on a green felt table with 16 balls, side + corner pockets, click-drag aim + power. Sound physics, on-brief.
▶ LIVERaycaster 🥈
Game
Pure canvas-2D raycaster with pointer-lock mouse look, WASD movement, shift-to-run, M-map toggle. Internal render resolution scales by aspect for speed. Polished HUD with kbd-styled key hints, FPS counter, click-to-capture overlay. Strong technical implementation.
▶ LIVERpg
Game
Top-down RPG with tilemap, NPCs, combat, inventory UI. 26KB of game state. Solid hit on the brief.
▶ LIVELanding 🥇
Page
Animated mesh-gradient background (4 drifting blobs in screen blend), noise grain overlay, vignette, glass nav with smooth scroll. Reads like an actual Apple product page. Better composed than any other landing attempt.
▶ LIVEWebos 🥇
Page
A tiny working desktop OS in 24KB — wallpaper, taskbar dock with app icons, draggable resizable windows for Notes, Paint, Terminal (echo-only), Calculator. Apple-Sequoia aesthetic. Most ambitious application build on the bench.
▶ LIVEBlackhole 🥇
Sim
Photon back-tracing through a curved-space metric (claims as much in the code) for actual gravitational lensing — disk's far side lifted over and under the shadow. Loading screen says "computing space-time metric…" Range-slider parameter panel for spin/disk tilt/exposure. Most ambitious blackhole attempt by code structure.
▶ LIVEBoids
Sim
Canvas2D boids with separation/alignment/cohesion. Hundreds of agents, click to disturb the flock, HUD shows agent count + FPS.
▶ LIVECloth 🥉
Sim
Verlet-integrated cloth on three.js + WebGL with OrbitControls. Pin corners, drag any point. Real-time physics, not a billboard.
▶ LIVEFluid
Sim
Stable-fluids style 2D simulation with click-and-drag density+velocity injection. Polished glass HUD, gradient title, live pill indicator, right-side controls panel. Touch-action set so it works on mobile. Visually on par with Opus's blob-in-bowl.
▶ LIVEFractal
Sim
WebGL Mandelbrot shader with click-to-zoom and hold-to-zoom-continuously. HUD shows current center re/im coordinates and zoom level live. Mode selector for color schemes, kbd-styled key hints, flash transitions. Beats most fractal attempts on UI feedback.
▶ LIVEGalaxy
Sim
Three.js with EffectComposer + UnrealBloomPass for proper bloom. 140k stars in a logarithmic spiral with 4 arms + 28k dust particles. ACES filmic tone mapping, OrbitControls with damping, FogExp2 for depth. Visually on par with Opus's interactive 3D galaxy.
▶ LIVEOrbit
Sim
Top-down inner-system map: Mercury / Venus / Earth / Mars orbiting the sun with accurate relative speeds. Per-planet colour palette, info card on hover, controls bar at bottom with speed slider and play/pause. Solid hit on the brief, ties with GLM on the same task.
▶ LIVEParticleforge 🥈
Sim
Particle Forge — sculpt swirling particle systems with mouse gravity. Multiple presets (vortex/attractor/repulsor/magnet), colour schemes, FPS counter. 19KB.
▶ LIVEPathtracer
Sim
WebGL fragment-shader path tracer — Cornell-box-style scene with accumulating samples, soft shadows, indirect bounce. Real renderer, not faked.
▶ LIVEReactiondiff 🥉
Sim
Gray-Scott reaction-diffusion as a WebGL shader. Click to seed concentrations, real-time Turing patterns emerge. Sliders for f and k.
▶ LIVESolar 🥇
Sim
Most polished solar attempt I've graded — glass-morphism control panel with time slider, sun-glow slider, orbits/labels/pause toggles, hover info cards on every planet, Saturn's rings, accurate moons. Drag-to-orbit + scroll-to-zoom. Beats Opus on UI density without losing the physics.
▶ LIVEWormhole
Sim
Three.js wormhole tunnel with distorted starfield, hold-space to accelerate forward. Real depth + gravitational stretching.
▶ LIVEAurora
Visual
Aurora ribbons over a mountain ridge silhouette, WebGL noise shader. Slow morphing curtains in cyan + magenta. Smaller scope (10KB) but the prompt is met.
▶ LIVEFireworks 🥇
Visual
Click to launch fireworks — particle trails, sparkle physics, AND a synthesized whoosh + boom via Web Audio. Most polished fireworks of any model.
▶ LIVELavalamp
Visual
WebGL metaball shader with warm gradient. Smooth blob morphing, low-frequency motion. Simpler than the deep builds but on brief.
▶ LIVEMatrix
Visual
Classic Matrix-rain falling green glyphs with varying speeds + brighter leading char + Web Audio click beep on column reset.
▶ LIVEPlasma
Visual
Hypnotic full-screen plasma effect with 5 palettes, click anywhere to create a ripple. Smooth slow motion. 13KB but the brief is fully met.
▶ LIVESynthwave
Visual
Synthwave flythrough on three.js + WebGL. Neon grid below, scanline sun, mountain silhouettes. CRT effect on top.
▶ LIVETerrain
Visual
Tron-style procedural terrain flythrough with three.js + bloom. Glowing grid mountains, retro horizon. Drag to steer.
▶ LIVEVoxel 🥇
Visual
Closest thing to a real Temple Run any model has shipped: 3-lane runner with chunk streaming, jump + slide mechanics, coins, hurdles, gates, increasing speed, score/coins/speed/best HUD pills, touch-swipe support, gradient-text overlay card. Other voxel attempts were visuals only — this one's playable front to back.
▶ LIVEWaves
Visual
Gerstner-wave ocean on three.js + WebGL with sun-reflection specular, foam crests, drag to look around. Looks like a real ocean.
every demo, in a grid · click any one to play
Compare Fusion against every other model
Every head-to-head featuring Fusion. Verdicts shown for scored pairs.
Fusion
vs
Claude Opus 5
Fusion leads 29–16
Fusion
vs
Hermes MoA
Fusion leads 29–18
Fusion
vs
GPT-5.6 Sol
Fusion leads 30–17
Fusion
vs
Claude Fable 5
Fusion leads 36–7
Fusion
vs
Qwen 3.8
Fusion leads 27–14
Fusion
vs
Grok
Fusion leads 31–2
Fusion
vs
MiniMax M3
Fusion leads 37–2
Fusion
vs
Fugu Ultra
Fusion leads 26–4
Fusion
vs
Kimi K3
Fusion leads 31–15
Fusion
vs
GLM-5.2
Fusion leads 39–5
Fusion
vs
Fugu Mini
Fusion leads 25–3
Fusion
vs
Opus 4.8
Fusion leads 36–2
Fusion
vs
Kimi K2.7
Fusion leads 21–1
Fusion
vs
Qwable 5 27B Coder
Fusion leads 35–6
Fusion
vs
Gemini 3.6 Flash
Fusion leads 37–10
Fusion
vs
Claude Sonnet 5
Fusion leads 37–7
Fusion
vs
Qwen 3.7
Fusion leads 46–0
Fusion
vs
Fugu Ultra 1.1
Fusion leads 22–1
Fusion
vs
Inkling
Fusion leads 45–2
Fusion
vs
Agents-A1
Fusion leads 42–0
Fusion
vs
Gemma 4 12B · MLX
Fusion leads 42–0
Fusion
vs
Laguna XS 2.1
Fusion leads 42–0
Fusion
vs
Qwythos 9B
Fusion leads 42–0
Fusion
vs
LongCat-2.0
Fusion leads 4–0
Fusion
vs
Hy3
Fusion leads 7–0
Fusion
vs
Gemma-4 12B Coder
Fusion leads 6–0
Fusion
vs
DeepSeek V4 Flash
47 shared tasks · unscored
Fusion
vs
DeepSeek V4 Pro
47 shared tasks · unscored
Fusion
vs
Kimi K2.7 · Fast
47 shared tasks · unscored
Fusion
vs
Kimi K2.7 · No-Think
47 shared tasks · unscored
Fusion
vs
Kimi K2.7 · Quality
47 shared tasks · unscored
Fusion
vs
Ornith 1.0
42 shared tasks · unscored
Fusion
vs
Claude Mythos 5
Reference-only
Fusion
vs
Kilo Code
Reference-only
See all 66 comparisons across every model →
Quick pill index
Direct comparisons against every other scored model on the bench:
Fusion vs Claude Opus 5 Fusion vs Hermes MoA Fusion vs GPT-5.6 Sol Fusion vs Claude Fable 5 Fusion vs Qwen 3.8 Fusion vs Grok Fusion vs MiniMax M3 Fusion vs Fugu Ultra Fusion vs Kimi K3 Fusion vs GLM-5.2 Fusion vs Fugu Mini Fusion vs Opus 4.8 Fusion vs Kimi K2.7 Fusion vs Qwable 5 27B Coder Fusion vs Gemini 3.6 Flash Fusion vs Claude Sonnet 5 Fusion vs Qwen 3.7 Fusion vs Fugu Ultra 1.1 Fusion vs Inkling Fusion vs Agents-A1 Fusion vs Gemma 4 12B · MLX Fusion vs Laguna XS 2.1 Fusion vs Qwythos 9B Fusion vs LongCat-2.0 Fusion vs Hy3 Fusion vs Gemma-4 12B CoderRead more on agentos.guide: /fusion-api
Fusion — frequently asked
What is Fusion?
Fusion is OpenRouter's AI model — Multi-model panel — Fable 5 + GPT-5.5, ensembled. Beats Fable 5 at half the price. It has a Varies (per-panel) context window and was released 2026-06-14.
How good is Fusion at coding and one-shot builds?
On the GoldieBench one-shot build benchmark it averages 8.59/10 across 47 scored tasks, with 21 gold, 3 silver and 3 bronze medals.
How much does Fusion cost?
OpenRouter Fusion API pricing. OpenRouter's Fusion API dispatches a single prompt to multiple frontier models and ensembles the answers. Premium panel: Fable 5 + GPT-5.5. Budget panel: cheaper open-weights models. Roughly half the per-token cost of a
Where can I see Fusion demos?
Every one-shot build is live and playable on this page and on the GoldieBench compare matrix — same prompt as every other model, no retries.
The same stack Julian uses
Run this stack yourself.
Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 4,000+ founders shipping with it every day all live inside the AI Profit Boardroom.
4,000+founders
258documented wins
38countries
$59/momonthly