GPT‑5.3‑Codex‑Spark

In plain words

GPT-5.3-Codex-Spark is an AI coding model designed for developers who need fast, real-time code generation. It delivers 15x faster generation speeds than previous versions with a 128k context window, enabling interactive collaboration where users can interrupt and redirect the model mid-task. The model prioritizes minimal latency and lightweight edits over automatic actions, making it suitable for rapid iteration and interactive development workflows. It is currently available in research preview for ChatGPT Pro users.

written from the facts on this page · September 2026

From the sources

15x faster generation, 128k context, now in research preview for ChatGPT Pro users. Codex-Spark is optimized for interactive work where latency matters as much as intelligence. You can collaborate with the model in real time, interrupting or redirecting it as it works, and rapidly iterate with near-instant responses. Because it’s tuned for speed, Codex-Spark keeps its default working style lightweight: it makes minimal, targeted edits and doesn’t automatically run tests unless you ask it to.

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