GPT-5.3-Codex

OpenAI· released 24 Feb 2026

openai/gpt-5.3-codex

Input / 1M tokens: $1.75
Output / 1M tokens: $14

Context window400K tokens

Longest answer: 128K tokens

reads textreads imagereads filetool callingvisionreasoning

About

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...

Details

Lab: OpenAIopenrouter.ai · 3 Oct 2026
Context: 400Kopenrouter.ai · 3 Oct 2026
Input price: $1.75 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $14 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 128,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, image, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/openai/gpt-5.3-codex· checked 3 Oct 2026