GitHub Copilot's Project HydraFusion Promises Frontier Level Performance through Multi-Model Routing

Routing beats picking one model. GitHub’s Project HydraFusion sends each Copilot request down one of three paths: a single model, a cascade to a stronger model when quality gates fail, or draft-then-critique. On TerminalBench 2.1 it reports 4.9 points better task quality at 67% lower cost than Claude Opus 5, and on an internal multi-turn benchmark it lands within 0.1 points at 65% less. Research preview, in the Copilot CLI under /experimental.