# OpenRouter: Fusion

> Fusion turns a prompt into a small multi-model deliberation. A panel of expert models (Quality preset: Claude Opus, GPT, and Gemini Pro; Budget preset: Gemini Flash, DeepSeek V3.2, and Kimi) analyzes the prompt in parallel with web search and web fetch enabled, then a judge model synthesizes their responses into a structured analysis — consensus, contradictions, partial coverage, unique insights, and blind spots — and writes the final answer. Reach for it when a single model isn't enough: research, expert critique, or anywhere the cost of being wrong outweighs a few extra completions. Because every panel member plus a judge call runs, the request is priced as the sum of those underlying completions. Available with a user-owned API key (BYOK).

**ID**: `openrouter/fusion`  
**Creator**: OpenRouter  
**Category**: multimodal  
**Context**: 128K tokens  
**Pricing**: BYOK — billed by your provider  
**Released**: 2026-06-03  
**Web page**: https://anyrouter.dev/model/openrouter/fusion

**Input modalities**: text, image  
**Output modalities**: text  

**Capabilities**: chat, reasoning, agentic, vision, streaming, function-calling

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openrouter/fusion",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| openrouter-byok | BYOK — billed by your provider | — |
| respan-byok | BYOK — billed by your provider | — |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Source

- Upstream docs: https://openrouter.ai/models/openrouter/fusion