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...
Developer
OpenAI
Release Date
February 24, 2026
Context Window
400,000 tokens≈ 533 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$1.75per million tokens
Output Cost
$14.00per million tokens
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