Fusion
Multi-model panel — Fable 5 + GPT-5.5, ensembled. Beats Fable 5 at half the price.
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..
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: 0 one-shot demos across Varies — depends on which panel models are dispatched of context. Of those, 0 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 demo by Fusion
0 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.
Head-to-heads with Fusion
Direct comparisons against every other scored model on the bench:
Fusion vs Opus 4.8 Fusion vs GLM-5.2 Fusion vs Grok Fusion vs Qwen 3.7 Fusion vs Kimi K2.7Read more on agentos.guide: /fusion-api
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 3,600+ founders shipping with it every day all live inside the AI Profit Boardroom.