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GPT-5.3-Codex long-term support in GitHub Copilot - GitHub Changelog

… GitHub Copilot data has shown that GPT-5.3-Codex has a significantly high code survival rate among enterprise customers. GPT-5.3-Codex as the newest base model GPT-5.3-Codex will also be available as the newest base model for Copilot, replacing GPT-4.1. …

Mar 18, 2026 · Allison

github.blog › changelog

GPT-5.3-Codex is now the base model for Copilot Business and Enterprise - GitHub Changelog

… May 17, 2026: GPT-5.3-Codex becomes the base model for all Copilot Business and Copilot Enterprise organizations. February 4, 2027: End of the LTS availability window for GPT-5.3-Codex. …

May 17, 2026 · Allison