Run many models side by side and fuse the best answer
Model Fusion is a new public experiment from OpenRouter Labs. It runs your prompt through multiple models, analyzes their outputs, and uses a customizable "judge" model to fuse the best aspects into a single, superior response.
Fusion integrates with OpenRouter's routing and fallback system to automatically try alternative models when one fails, with billing only for successful runs through Zero Completion Insurance
Model Fusion provides a unified interface to test and compare outputs from 60+ providers and 400+ models, enabling data-driven selection before committing to a specific provider or model
Model Fusion runs multiple models simultaneously on the same prompt, allowing users to analyze each model's strengths and weaknesses in real-time, then select or combine the best responses for their use case
OpenRouter's auto-routing and model fallback features combined with Fusion's multi-model analysis enable users to identify optimal cost-to-quality ratios across 400+ models without vendor lock-in