GitHub Copilot deprecates Gemini 2.5 Pro and Gemini 3 Flash
They disappear from Chat, completions and agent mode; switch to Gemini 3.1 Pro Preview or 3.6 Flash. Plus: MCP's stateless rewrite ships with four SDKs.
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Gone across every Copilot surface
GitHub deprecated Gemini 2.5 Pro and Gemini 3 Flash across all of Copilot — Chat, inline edits, ask and agent modes, and code completions. No action is needed to remove them; they phase out automatically, so any workflow or script pinned to those model IDs will quietly fall back to a default.
Your migration path: 3.1 Pro Preview and 3.6 Flash
The replacements are Gemini 3.1 Pro (Preview) and Gemini 3.6 Flash. Individual devs pick them from the model selector in VS Code or on github.com, but enterprise admins must first enable them via model policies in Copilot settings — until they do, teams see no Gemini option at all.
Elsewhere: MCP's stateless rewrite is final
The MCP 2026-07-28 spec drops the initialize handshake and session IDs so any request can hit any server behind a load balancer, and adds mid-call input prompts, header-based routing, and cacheable tool lists. All four Tier-1 SDKs — TypeScript, Python, Go, and C# — already support it, with Rust in beta.