GitHub launched Project HydraFusion as a research preview: it orchestrates models and workflows per coding task. In controlled offline evals vs Claude Opus 5 on Terminal-Bench 2.1 it reported higher verified task quality and lower estimated cost. Select it like any other model in GitHub Copilot, or try via /experimental in Copilot CLI.

Key Takeaways

  • ✓Bench: ~+4.9 percentage points verified task quality vs Claude Opus 5 on Terminal-Bench 2.1.
  • ✓Cost: ~67% lower estimated workflow cost in controlled offline evaluations.
  • ✓Access: research preview in GitHub Copilot; try via /experimental in Copilot CLI.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Bench: ~+4.9 percentage points verified task quality vs Claude Opus 5 on Terminal-Bench 2.1.
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💰 Cost & PlansCompare
Claude Opus 5 · in: $15 / out: $75
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🛠️ Ecosystem & IDERules
HydraFusion · GitHub Copilot · Copilot CLI
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Up NextGitHub Copilot updates HydraFusion and adds HydraFusion Max, with Claude Opus 5.5 and the GPT-6 family in its model pool
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