# OpenAI Unveils GPT-5.3-Codex as Most Advanced AI Coding Model Yet

OpenAI announced the release of GPT-5.3-Codex, which the company describes as its most capable AI coding model to date.

The new model combines the advanced coding performance of its predecessor, GPT-5.2-Codex, with enhanced reasoning abilities and professional knowledge capabilities from GPT-5.2. This merger represents a significant step forward in "agentic" coding—where AI systems can work more autonomously on programming tasks.

By integrating these capabilities, GPT-5.3-Codex aims to handle complex software development tasks that require both technical coding skills and broader contextual understanding. The model can potentially assist developers with everything from writing code to understanding business requirements and making architectural decisions.

This release continues OpenAI's push to create AI systems that can function as more independent