About GPT-5.3-Codex
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...
Specifications
- Provider
- OpenAI
- Context Length
- 400,000 tokens
- Input Types
- text, image, file
- Output Types
- text
- Category
- openai/gpt-5.3-codex-20260224
- Added
- 2/24/2026