Polaris — AI news & analysis

Microsoft unveils Project Polaris at Build 2026 — its own model replaces OpenAI inside GitHub Copilot starting August

At Microsoft Build 2026 on June 2, Satya Nadella unveiled Project Polaris — Microsoft's in-house mixture-of-experts coding model that will replace GPT-4 Turbo as the default engine for all GitHub Copilot subscribers starting August 2026. The transition is automatic with an optional three-month fallback. Polaris outperforms GPT-4 Turbo on HumanEval and MBPP — especially on low-resource languages like Rust and Haskell. Microsoft's deepest decoupling from OpenAI to date.