GitHub Copilot's HydraFusion Auto-Picks AI Models, Cuts Costs Up To 67%
HydraFusion launched September 4, 2026, letting Copilot cascade between cheap and strong AI models without the coder choosing anything, GitHub says.
- TerminalBench 2.1: cost 67% lower and quality up 4.9 points versus Claude Opus 5.
- DeepSWE: cost 36% lower, but quality 1.5 points below Opus 5 on that test.
- CheckpointBench: cost 65% lower, quality within 0.1 point of Opus 5, GitHub reports.
Why it matters: A tool that picks its own model has taken the one decision that was still yours.