OpenAI has unveiled its latest coding model, GPT-5.3-Codex, delivering a significant leap in performance over its predecessor.

The new model improves on GPT-5.2-Codex by merging its coding capabilities with the reasoning and specialized knowledge abilities of GPT-5.2, achieving dual advancements in both performance and speed.

The upgrade boosts processing speed by 25%, enabling GPT-5.3-Codex to handle complex, long-term tasks that require research, tool usage, and intricate execution. In addition to its technical enhancements, the model offers users a more dynamic experience, allowing for real-time guidance and interaction, much like collaborating with a colleague.

Users can maintain context continuity throughout their work with GPT-5.3-Codex, making it an ideal choice for tasks that demand both precision and depth of understanding. The release of this model underscores OpenAI's continued focus on advancing AI capabilities for more efficient and intuitive user experiences in software development and beyond.