GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
In / out price$1.75/$14.00per 1M tokens
Context
400K tokens
Parameters
Undisclosed
Modalities
→
Released
Feb 24, 2026
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