product · May 18, 2026
GPT-5.3-Codex Becomes Base Model for Copilot Business and Enterprise
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GitHub announced on May 17, 2026 that GPT-5.3-Codex is now the base model for Copilot Business and Enterprise organizations, replacing GPT-4.1. GPT-5.3-Codex launched on February 5, 2026 in partnership with OpenAI and serves as the first long-term support model guaranteed available through February 4, 2027. The model carries a 1x premium request unit multiplier while GPT-4.1 remains at 0x until its deprecation alongside usage-based billing on June 1, 2026. GitHub Copilot data has shown that GPT-5.3-Codex has a significantly high code survival rate among enterprise customers.
Spend governor blocked model creation: provider_circuit_open (lane=dev, provider=together)