Project HydraFusion: Frontier quality via multi-model orchestration

Project HydraFusion, now a research preview in GitHub Copilot, orchestrates multiple AI models at runtime, selecting among single-model, cascade, or critique workflows to balance performance, cost, and latency. In offline tests on three coding benchmarks, it raised verified task quality by 4.9 percentage points while cutting estimated cost by 67% versus Claude Opus 5.