Real head-to-head · same prompt, one shot
Fusion vs Claude Opus 5
Multi-model panel — Fable 5 + GPT-5.5, ensembled. Beats Fable 5 at half the price. vs The new Anthropic flagship — benched on all 45 one-shot builds the day it landed.
Head-to-head verdict: Fusion wins 29–16 with 2 ties.
What I tested — same prompt, two models
I run the same fixed prompt set through every new model the day it drops — same string, one shot, single HTML file out — and I score the result 0–10 on whether it ran, how close it hit the brief, and how good it looked. Below is what came out when I gave the exact same prompts to Fusion and Claude Opus 5, side by side, on 47 shared tasks inside the Agent Operating System.
Both models were given identical prompts inside the Agent Operating System — no help, no iteration, no "best of N" tricks. I run each prompt once, save the HTML file the model produces, and score it 0–10 on whether it ran, how close it hit the brief, and how good it looked. The scoring is mine. The verdicts below are pulled from my source comparison guides at agentos.guide where I publish every score and the reasoning behind it.
Fusion · Dispatched from Agent OS for research-heavy prompts where ensemble accuracy outweighs single-model speed.
Claude Opus 5 · Benched on all 45 GoldieBench tasks via API on release day, incremental deploys as scores landed.
Side-by-side on 50 shared tasks
Click any cell to play that model's actual one-shot attempt. Medals are derived from my 0–10 scores per task (highest = 🥇, second = 🥈, third = 🥉).
Task ↓
Fusion
Claude Opus 5
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Where Fusion beat Claude Opus 5
The tasks where I gave Fusion a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Neonblaster
Game
Fusion 9.0
·
Claude Opus 5 6.8
(+2.2)
· winner · arcade juice
What I saw: 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.
Twilightvale
Game
Fusion 9.5
·
Claude Opus 5 7.3
(+2.2)
· winner · open world RPG
What I saw: 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.
Arcade
Game
Fusion 8.5
·
Claude Opus 5 6.5
(+2.0)
What I saw: 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.
Pool
Game
Fusion 8.0
·
Claude Opus 5 6.0
(+2.0)
What I saw: Canvas2D billiards on a green felt table with 16 balls, side + corner pockets, click-drag aim + power. Sound physics, on-brief.
Doom
Game
Fusion 8.5
·
Claude Opus 5 6.8
(+1.7)
What I saw: Doom-style raycaster shooter: sprite enemies, gun with muzzle flash, ammo + health HUD. WASD + mouse-look + click to fire. 20KB of game logic.
Where Claude Opus 5 beat Fusion
The tasks where I gave Claude Opus 5 a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Lavalamp
Visual
Claude Opus 5 8.7
·
Fusion 7.5
(+1.2)
· metaball lava lamp
What I saw: Gorgeous shader metaball fluid with convincing tapered glass body, glowing gold cap and ribbed metal base, plus palette switching, heat slider and pointer interaction — clearly matches the field's best. Only nit: static screenshot can't confirm morph smoothness, but the blob vari…
Aurora
Visual
Claude Opus 5 8.6
·
Fusion 7.5
(+1.1)
· cinematic aurora scene
What I saw: Gorgeous WebGL curtains with realistic vertical streaks, layered mountains, starfield and water reflection make this a full cinematic scene; polished palette switcher and typography plus reflection depth push it past the field's best.
Orbit
Sim
Claude Opus 5 9.0
·
Fusion 8.0
(+1.0)
· 3D N-body simulation
What I saw: Gorgeous 3D N-body sim with a glowing central star, 167 orbiting bodies with velocity trails, merges counter (12), tilted disks and companion cluster — genuine physics with softening, substeps, and merging, plus a polished camera/UI. Strong: visible dynamic simulation and beautif…
Aipbpromo
Page
Claude Opus 5 8.3
·
Fusion 7.5
(+0.8)
What I saw: Gorgeous cinematic 3D wireframe icosphere backdrop with floating particles, gradient brand title, and full HUD (timeline, progress dots, controls) make this genuinely Remotion-grade; slightly held back by the 'PAUSED' overlay overlapping the brand text in this capture, though the…
Outrun
Game
Claude Opus 5 8.7
·
Fusion 8.0
(+0.7)
· neon horizon king
What I saw: Gorgeous synthwave scene nails the brief — striped sun, glowing pink/cyan road edges, palm trees, mountains, and a real curving pseudo-3D ribbon with pickups and combat HUD (kills/hostiles). Only minor knock is no enemy actually visible in this frame, but the aesthetic and depth …
Strengths & weaknesses I logged
Fusion
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
Claude Opus 5
Strengths
- Frontier-class coding + agentic reasoning (Claude 5 family)
- 1M-token context — reads an entire codebase in one call
- Benched here with skill-infused game prompts the day of release
Trade-offs
- Premium pricing ($5/$25 per M) — route the everyday 90% to cheaper lanes
- Reasoning-by-default eats token budgets unless tuned per call
Pricing & context — the spec sheet
| Spec | Fusion | Claude Opus 5 |
|---|---|---|
| Vendor | OpenRouter | Anthropic |
| Context window | Varies — depends on which panel models are dispatched | 1,000,000 tokens |
| Price | OpenRouter Fusion API pricing | $5 / $25 per M |
| 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. | Anthropic's brand-new flagship — the first Opus of the Claude 5 family, with a 1M-token context window. Benched via API the day it dropped; game tasks use our skill-infused AAA build prompts. |
| Release | 2026-06-14 | 2026-07 |
| Bench coverage | 47/47 scored · avg 8.59/10 | 50/50 scored · avg 8.27/10 |
The verdict — which should you pick?
Across 47 scored shared tasks, Fusion averaged 8.59/10, beating Claude Opus 5's 8.29/10 by 0.31 points. Pick Fusion when the build has to ship on the first prompt and you can afford the trade-offs in the comparison below.
If you only run one of these inside your stack, the head-to-head average above is the call. If you can run both, my honest play is to wire Fusion and Claude Opus 5 both into the Agent Operating System and dispatch each from the kanban by task type — deep-research workflows where panel consensus beats single-model answers → Fusion, hardest agentic builds → Claude Opus 5. That's the same setup I run for the 4,000+ founders inside the AI Profit Boardroom.
FAQ — Fusion vs Claude Opus 5
Which is better, Fusion or Claude Opus 5?
On Goldie Bench, Fusion averages 8.59/10 across the shared tasks, with 21 gold, 3 silver, 2 bronze overall. Claude Opus 5 averages 8.29/10, with 13 gold, 7 silver, 5 bronze. Fusion wins the head-to-head 29–16.
How much does Fusion cost vs Claude Opus 5?
Fusion: 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. Claude Opus 5: Anthropic's brand-new flagship — the first Opus of the Claude 5 family, with a 1M-token context window. Benched via API the day it dropped; game tasks use our skill-infused AAA build prompts.
What's the context window for Fusion vs Claude Opus 5?
Fusion has a Varies — depends on which panel models are dispatched context window. Claude Opus 5 has a 1,000,000 tokens context window.
When should I pick Fusion over Claude Opus 5?
Pick Fusion 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. The trade-off is the weaknesses we logged on the bench: 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.
When should I pick Claude Opus 5 over Fusion?
Pick Claude Opus 5 for: Hardest agentic builds; Whole-repo reasoning; Frontier one-shots. The trade-off is the weaknesses we logged on the bench: Premium pricing ($5/$25 per M) — route the everyday 90% to cheaper lanes; Reasoning-by-default eats token budgets unless tuned per call.
How does Goldie Bench score Fusion vs Claude Opus 5?
Every demo on this page was built by Julian Goldie inside the Agent Operating System — same fixed prompt for both models, one shot, single HTML file out. Each result gets a 0–10 score on whether it ran, how close it hit the brief, and how good it looked. The highest score on each task gets gold; second gets silver; third gets bronze. See methodology for full provenance.
Related comparisons
Other head-to-heads using the same scoring system:
Fusion vs Hermes MoA Claude Opus 5 vs Hermes MoA Fusion vs GPT-5.6 Sol Claude Opus 5 vs GPT-5.6 Sol Fusion vs Claude Fable 5 Claude Opus 5 vs Claude Fable 5 Fusion vs Qwen 3.8 Claude Opus 5 vs Qwen 3.8Full model pages: Fusion · Claude Opus 5 · back to the leaderboard
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