OpenAI Launches GPT-5.3-Codex: Enhanced Agentic Coding Model with 25% Speed Improvement
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Summary
OpenAI introduces GPT-5.3-Codex, a new agentic coding model that combines frontier coding performance from GPT-5.2-Codex with enhanced reasoning and professional knowledge capabilities from GPT-5.2. The model is 25% faster and designed for long-running tasks involving research, tool use, and complex execution. It features interactive capabilities allowing users to steer and interact with the model during work without losing context, positioning it as a collaborative tool for real-world technical work.
Key quotes
· 5 pulledGPT‑5.3‑Codex, the most capable agentic coding model to date
The model advances both the frontier coding performance of GPT‑5.2‑Codex and the reasoning and professional knowledge capabilities of GPT‑5.2, together in one model, which is also 25% faster
This enables it to take on long-running tasks that involve research, tool use, and complex execution
Much like a colleague, you can steer and interact with GPT‑5.3‑Codex while it's working, without losing context
GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work
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