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github: GPT-5.3-Codex is now the base model for Copilot Business and Enterprise

· Sujith Quintelier · May 18, 2026, 6:33 a.m.

github software development copilot AI Models

Summary

GitHub announces that GPT-5.3-Codex will be the default base model for Copilot Business and Enterprise, replacing GPT-4.1. This model will be used unless another is selected by the organization.

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