CODE & AGENTS · OpenAI
GPT-5.3-Codex
GPT-5.3-Codex is a reasoning, tool-using model from OpenAI in the GPT family, living in The Cedar Forest (code & agents). It reads text, files and images and writes text, with a 400K-token context window and up to 128K tokens of output. On OpenRouter it costs $1.75 per million input tokens and $14.0 per million output tokens.
See GPT-5.3-Codex in 3DOpen in the WorktableView on OpenRouter
Specifications
- Provider
- OpenAI
- Family
- GPT
- Province
- The Cedar Forest
- Context window
- 400K tokens
- Maximum output
- 128K tokens
- Input / 1M tokens
- $1.75
- Output / 1M tokens
- $14.0
- Accepts
- text, files, images
- Produces
- text
- Reasoning
- Yes
- Tool use
- Yes
- Added to OpenRouter
- 2026-02-24
- Model ID
openai/gpt-5.3-codex- Price history
- —All recorded prices
From the 2026-10-24 catalog snapshot. Prices are US dollars per million tokens.
More GPT models
- GPT-5.2-Codex400K · $1.75 / $14.0
- GPT-5.1-Codex-Max400K · $1.25 / $10.0
- GPT-5.1-Codex400K · $1.25 / $10.0
- GPT-5.1-Codex-Mini400K · $0.250 / $2.00