GitHub Copilot introduces HydraFusion Max with expanded model pool

GitHub Copilot adds HydraFusion Max, a higher-capacity version of HydraFusion for more demanding coding tasks. The expanded model pool now includes Claude Opus 5.5, GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. HydraFusion now uses tailored reasoning effort, applying medium effort for drafts and high effort for review. Cascade can now judge initial output before escalation, and Critique runs parallel critics with direct workspace inspection.