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

Back to changelog To give enterprises the stability they need for internal security and safety reviews, GitHub has established a new commitment with long-term support LTS models available for Copilot Business and Copilot Enterprise. …

Mar 18, 2026 · Allison

github.blog › changelog

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

… LTS models are guaranteed to be available for a full 12 months from the model’s launch date, giving enterprises the stability they need for internal security and safety reviews. …

May 17, 2026 · Allison