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4.9 percentage points higher verified task quality. 67% lower estimated cost. Project HydraFusion delivered those results against Claude Opus 5 on Terminal-Bench 2.1 in controlled offline evaluations. HydraFusion orchestrates the models and workflow for each coding task github.blog/ai-and-ml/gi...

github.blogProject HydraFusion: Frontier quality via multi-model orchestrationIn controlled offline evaluations, HydraFusion’s selective coding workflows matched or exceeded the evaluated Opus 5 baseline while reducing estimated cost.

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You select it like any other model. Try HydraFusion through /experimental in GitHub Copilot CLI.