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GPT 5.3 Codex

OpenAI

Introduction

GPT 5.3 Codex is an AI model developed by OpenAI. It supports Chat, Vision, Code capabilities.

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400,000 tokens

150 tokens/s

12000 tokens/s

Chat

Vision

Code

Input Tokens400,000 tokens

Output Tokens128,000 tokens

$0.00175/1K input, $0.014/1K output

Release Information

Release Date2026-02-01

Versiongpt5.3

Try GPT 5.3 Codex with Lunabot

GPT 5.3 Codex - AI Model Timeline