GitHub Copilot Fusion picks and combines models for each coding task

GitHub has made Copilot Fusion generally available on all Copilot plans in VS Code, the GitHub Copilot app, GitHub Copilot CLI and JetBrains IDEs. Instead of choosing a model, you pick an effort level (Standard, High or Max) and Fusion routes each task: to one model, to a cheaper model whose draft escalates to a stronger one if a quality check fails, or to a draft that a second model reviews before revision. GitHub says Fusion Max scored 60 on the Artificial Analysis Coding Agent Index, within two points of Claude Code with Opus 5.5 Max, at about half the average API cost per task; these are GitHub's own figures, not an independent test. You are billed for each model it uses at standard rates, with a 30% discount on model costs for paid plans for a limited time.