GitHub has released Project HydraFusion as a research preview within GitHub Copilot CLI. This system replaces static model selection with dynamic workflow orchestration, building an execution plan per request that can draft, critique, or escalate across models from multiple providers.
HydraFusion selects one of three patterns for each task: Single (direct solution), Cascade (drafting with quality gate escalation), or Critique (cross-family review). The runtime enforces guardrails including bounded execution, isolated reviews in tool-less contexts, and complete cost accounting. Benchmarks against Claude Opus 5 show a +4.9 point quality gain at 67% lower cost on TerminalBench 2.1, while trailing slightly on DeepSWE and CheckpointBench with significant cost reductions.
The feature is available to all Copilot plan users via the /experimental command, billed at each underlying model's standard rate.