OpenAI has officially announced the launch of GPT-5.3-Codex, its most advanced AI model specifically engineered for software development. While maintaining the core logic and extensive knowledge base of its predecessor, GPT-5.2-Codex, this new iteration introduces significant breakthroughs in speed, efficiency, and real-time collaboration.
Faster, Leaner, and More Collaborative
The standout feature of GPT-5.3-Codex is its 25% increase in execution speed, achieved through a more efficient tokenization process. Key highlights include: