GPT‑5.3‑Codex Is Now the Default in GitHub Copilot — What That Actually Means for .NET & Azure Engineers

TL;DR: As of May 17, 2026, GitHub Copilot Business and Enterprise organizations were automatically moved to GPT‑5.3‑Codex as the base model. This is not a cosmetic upgrade. It changes latency characteristics, code-edit behavior, and—combined with upcoming usage‑based billing—how you should...

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