OpenRouter has launched Fusion, a new mode that runs multiple AI models in parallel and fuses their outputs, formally promoting an API version on June 13, 2026 as "the smartest compound model in the market." The company first unveiled Fusion as a public experiment on March 31, 2026, then strengthened the feature. Positioned as a way to overcome the limits of relying on a single model, Fusion claims to "achieve Fable-level intelligence at half the price."
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