Developers who care more about accuracy than cost can run several models plus a judge in one call, paying for every model involved.

Kenning's take

What it does

Fusion is a feature of OpenRouter that runs a prompt through several models at once, each with web search, then has a judge model compare the answers for agreement, contradictions and gaps before writing a final response. It is called like a single model through the openrouter/fusion slug, with preset or custom panels. OpenRouter reported that fused panels beat individual frontier models on the DRACO deep research benchmark.

• Panel of models answering in parallel
• Judge model synthesises a final answer
• Web search and fetch for each panel member
• Quality and Budget presets or custom panels
• Single API slug, OpenAI-compatible
• Try in the OpenRouter chatroom

Who it suits. Developers building research or analysis features where accuracy matters more than cost.

Key facts

Category

Developer tools

Made by

OpenRouter, Inc

Released

12 June 2026

How to get it

OpenRouter API (model openrouter/fusion) and the OpenRouter chatroom

Works on

API, web chat

API price

sum of underlying model completions (panel plus judge)

FAQ

Facts from the maker's own pages and the sources listed. Checked 2026-10-11.