Introducing GPT-5.3-Codex

📰 OpenAI News

OpenAI introduces GPT-5.3-Codex, a Codex-native agent for technical work

advanced Published 5 Feb 2026

Action Steps

Explore GPT-5.3-Codex capabilities for coding tasks
Evaluate its general reasoning abilities for real-world technical work
Integrate GPT-5.3-Codex into existing development workflows
Assess its performance on long-horizon technical projects

Who Needs to Know This

Software engineers and AI researchers on a team can benefit from GPT-5.3-Codex for its coding performance and general reasoning capabilities, enabling them to tackle complex technical tasks

Key Insight

💡 GPT-5.3-Codex combines frontier coding performance with general reasoning for real-world technical work