OpenRouter Fusion API: Fable-Level Intelligence from Model Ensembles — And How to Do It Locally
After Fable 5's ban, OpenRouter introduced the Fusion API — a panel of models whose outputs are analyzed and fused by a judge model. How it works, the benchmarks, and how to replicate the approach locally with Ollama, LLM-Blender, AutoMix, and llama.cpp.