What changed
GitHub renamed and promoted HydraFusion to Copilot Fusion GA across major clients, with Standard, High and Max effort levels that use single, cascade or critique orchestration. An experimental preview can route between supported local and cloud models.
Why it matters
Developers can delegate model selection and multi-model orchestration while administrators govern the eligible pool, but every selected model is billed and local routing does not make the session fully offline.
What to do
Enable Fusion for one measured coding task, inspect selected models and total charges, then compare result quality and latency with a fixed-model route. Treat local routing as hybrid and test data movement explicitly.
Caveat
GitHub's benchmark and cost comparisons are vendor-reported. Each model is billed at its standard rate, with a temporary discount; local selection remains experimental and routing still uses cloud services.