# Fusion: several models, one answer

> Fusion sends your request to a panel of inexpensive models in parallel and an aggregator combines their answers. Frontier-level answers at a lower price.

Source: https://modeless-web.vercel.app/fusion

`model: "fusion"`

Several inexpensive models work on your request in parallel, and an aggregator combines their answers into one reply. The result holds up against frontier models and costs less.

## How it works

Every model has blind spots, and different models have them in different places. When several work on the same request and one weighs their answers, what one model misses another usually catches.

1. **Several models on every request**: A panel of models works on the same request at the same time.
2. **Answers checked against each other**: The aggregator compares the panel's answers, keeps what holds up, resolves where they disagree, and writes one reply.
3. **Frontier quality, lower price**: Together, inexpensive models reach the level of frontier models like Claude Opus 5.5, and still cost less.

- **Fusion**: 10% higher score than Claude Opus 5.5 (DRACO)
- **Fusion**: 50% lower cost per task than Claude Opus 5.5 (DRACO)

**Good fit**: hard questions where one model's blind spot is costly; deep research, design reviews, architecture plans, code review.

**Not a fit**: latency-sensitive chat or autocomplete (use Auto or a single fast model); high-volume, low-stakes requests where cost per call dominates.

## Benchmarks

### DRACO

Results coming soon.

Method: Harness: TBD · Questions: TBD · Runs per configuration: TBD · Cost: every panel and aggregator call, measured tokens × public USD prices

## Model card

- Protocols: Chat Completions · Anthropic Messages · Responses
- Streaming: Yes, the aggregator's reply streams
- Tool calls: Yes
- Panel: A fixed default panel of models and one aggregator
- Context length: TBD
- Models used: Inexpensive models on the panel. The panel changes between versions; your console lists every panel and aggregator call.
- Billing: every advisor call plus the aggregator call, each at its own model's price, plus 5%.