GitHub Copilot Fusion Goes GA, Routing Across Anthropic and OpenAI Models at Half the Cost

Copilot now automatically selects and coordinates models per coding task, landing just behind Claude Opus 5.5 in quality while cutting cost by 50 percent — a direct bet that routing beats loyalty.

GitHub made Copilot Fusion generally available this week, and the pitch is blunt: let the system pick the model, not the developer. According to @kimmonismus, Fusion automatically selects and coordinates AI models for a given coding task, scoring just behind Claude Opus 5.5 on quality while running at roughly 50 percent lower cost. The headline number is the cost delta. Matching a frontier coding model's output for half the price is the kind of economics that reshapes buying decisions across entire engineering organizations.

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