Prime Highlights

• GPT-5.3-Codex has replaced GPT-4.1 as the default model for Copilot Business and Enterprise users.
• The model will remain available for enterprise customers for 12 months under a long-term support programme.

Key Facts

• GitHub Copilot is an AI coding assistant used by developers and enterprise software teams.
• GPT-4.1 will remain temporarily available before its planned removal alongside usage-based billing changes in June.

Background

GitHub Copilot has started using GPT-5.3-Codex as the default model for Copilot Business and Copilot Enterprise customers, replacing GPT-4.1. The update applies to organizations that have not yet approved other AI models through their internal review systems.

The company said GPT-5.3-Codex is also its first long-term support model developed in partnership with OpenAI. The model launched in February and will remain available for enterprise users until February next year.

The long-term support system is designed to help businesses complete internal security and safety checks without worrying about sudden model changes.

According to the company, data from enterprise users showed GPT-5.3-Codex delivered a strong code survival rate, which measures how often AI-generated code remains in production systems after review and testing.

The update is expected to support software teams seeking stable, reliable coding tools.

The company also confirmed that GPT-5.3-Codex carries a one-time premium request multiplier under its usage system. GPT-4.1 will continue to remain available for some time with no premium request multiplier before it is removed alongside the introduction of usage-based billing in June.

The move comes as businesses push for technology solutions that deliver consistent uptime, steady performance and better coding capabilities.

Firms rolling out enterprise tools are paying closer attention to security, costs and dependable development systems as uptake grows across sectors.