Summary
On September 2, 2026, GitHub added support for setting any GitHub Copilot model as the default for new conversations through enterprise-managed settings, giving administrators central control over which model developers get by default.
What changed
GitHub extended enterprise-managed settings so admins can designate any available Copilot model as the default for new conversations, rather than leaving the default to individual developer choice or a fixed model.
Why it matters
As Copilot's model roster expands quickly (Claude Fable 5.1, Gemini 3.8 Flash, GPT-6 Astra), enterprises need a way to standardize on approved or cost-appropriate models. This puts model defaults under central governance, aligning Copilot usage with procurement, compliance, and spend controls.
Evidence excerpt
Admins can "set your preferred GitHub Copilot model as the default for new conversations through enterprise-managed settings."