GitHub Copilot launches HydraFusion: workflow plans instead of model picking

GitHub introduced Project HydraFusion, a research preview where Copilot builds an execution plan per prompt: a single model, a draft-then-escalate cascade, or a draft reviewed by a critic from another model family. GitHub claims up to 67% lower cost than Claude Opus 5 with higher verified quality on TerminalBench 2.1. It is available in Copilot CLI since 4 September and in VS Code 1.140 since 30 September for Pro, Pro+, Business and Enterprise.

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GitHub Copilot launches HydraFusion: workflow plans instead of model picking

Up to 67% lower cost than Claude Opus 5 with higher TerminalBench 2.1 quality
Three patterns: single model, cascade with quality gate, draft plus critic
Available in Copilot CLI since 4 September and VS Code 1.140 since 30 September
Billed per model leg used; the Auto selection discount does not apply

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