GitHub ships Copilot Fusion, which picks and mixes models for each coding task

TL;DR

• GitHub made Copilot Fusion generally available on 28 October: you select it in the model picker, choose an effort level, and Copilot routes and orchestrates the models.
• Artificial Analysis measured the max setting in Copilot CLI at $5.59 per task and 2 points below Claude Code with Opus 5.5 (max), which cost $11.42.
• GitHub bills each model at its standard rate, with a 30% discount for paid plans for a limited time.