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...
OpenAI: GPT-5.3-Codex — OpenAI. Context window 400,000 tokens. API pricing (per 1M tokens): Input $1.75, Output $14. License: Proprietary.
| Provider | OpenAI |
|---|---|
| API model ID | openai/gpt-5.3-codex |
| Tier | Frontier |
| Context window | 400,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $1.75 |
| API pricing (per 1M tokens) · Output | $14 |