Openrouter Fusion API

OpenRouter launched Fusion, a new API feature that turns a single prompt into a multi-model deliberation by analyzing it with a panel of expert models and synthesizing their responses via a judge model. The feature, priced as the sum of underlying completions, aims to improve accuracy in research and expert critique scenarios where the cost of being wrong outweighs extra completions.

OpenRouter: Fusion openrouter /openrouter /fusion Fusion turns your prompt into a small multi-model deliberation. A panel of expert models see below analyzes your 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 from it. By default the panel is the Quality preset; switch to Budget for cheaper members, or override the panel and judge entirely with the fusion plugin's analysis models and model fields. Reach for Fusion when a single model isn't enough — research, expert critique, or anywhere the cost of being wrong outweighs a few extra completions. Because Fusion runs every panel member plus a judge call, your request is priced as the sum of those underlying completions rather than a single model. To see which models ran, visit Activity /activity . Learn more in our docs /docs/guides/features/plugins/fusion . For another way to route, see the Auto Router /openrouter/auto . Quick Start Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.