Models & Labs
GPT-5.3-Codex now powers Copilot Business
GitHub Changeloghigh confidence
Why it matters
- →GPT-5.3-Codex offers long-term support, crucial for enterprise stability.
- →The model's high code survival rate indicates improved performance.
- →Transition to GPT-5.3-Codex reflects GitHub's focus on robust AI tools for businesses.
GitHub has transitioned to using GPT-5.3-Codex as the base model for its Copilot Business and Enterprise services, replacing the previous GPT-4.1 model. This new model, developed in partnership with OpenAI, is GitHub's first long-term support model, ensuring availability for 12 months, which is vital for enterprise security and stability. The model is noted for its high code survival rate among enterprise customers. While GPT-5.3-Codex comes with a premium request unit multiplier, GPT-4.1 will still be available temporarily until the introduction of usage-based billing in June 2026.
Read originalThe story around this
Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.
How we got here
- 1GPT 5.3 Codex Released
AI Explained · February 6, 2026 · Related
- 2OpenAI's GPT-5.5 Powers NVIDIA's Codex Application
NVIDIA Blog · April 23, 2026 · Related
What happened next
- 3GitHub Copilot shifts to token-based billing
AI News · June 2, 2026 · Related
- 4GitHub Deprecates GPT-5.2 Models in Copilot
GitHub Changelog · June 5, 2026 · Same story
- 5OpenAI's GPT 5.6 Powers Microsoft 365 Copilot
TechCrunch AI · July 10, 2026 · Related
- 6GPT-6 Astra now in GitHub Copilot
GitHub Changelog · September 4, 2026 · Same story
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