Simon Willison • 2/12/2026

Introducing GPT‑5.3‑Codex‑Spark

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OpenAI, in partnership with Cerebras, has introduced GPT-5.3-Codex-Spark, a smaller, faster version of GPT-5.3-Codex designed for real-time coding. The model features a 128k context window, is text-only, and claims speeds up to 1,000 tokens/second, enabling developers to maintain flow state and iterate more productively during coding sessions. The article details initial performance comparisons and potential use cases, though pricing details are not yet available.

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#ai coding #code generation #Openai
Introducing GPT‑5.3‑Codex‑Spark

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