AI model · OpenAI
GPT-5.3-Codex
Model ID: openai/gpt-5.3-codex
- Input
- $1.75 per 1M tokens
- Output
- $14 per 1M tokens
- Context
- 400K tokens at once
- Max output
- 128K tokens per reply
- Released
- 24 Feb 2026 OpenAI
What it can do
- YesReasoning
- YesTool calling
- YesImage input
- NoOpen weights
- NoFree to use
Takes text, image, file; gives text.
How its listing describes it
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...
Sources
- OpenAI: GPT-5.3-Codex on OpenRouter — read 2 Oct 2026