GPT-5.3-Codex
### TL;DR
GPT-5.3-Codex is OpenAI's most advanced agentic coding model, combining the coding performance of GPT-5.2-Codex with the reasoning and professional knowledge capabilities of GPT-5.2. It enables long-running tasks involving research, tool use, and complex execution, allowing interactive steering without losing context.
Key Insights & Metrics
Key Features
- Advanced agentic coding capabilities
- Enhanced reasoning and professional knowledge
- Supports long-running tasks with research and tool use
- Interactive steering without losing context
- 25% faster than previous models
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