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Introducing GPT-5.3-Codex-Spark

OpenAI launches GPT-5.3-Codex-Spark, a real-time coding model with 15x faster generation and 128k context, available in research preview for ChatGPT Pro users.

Feb 12 · 11:00:00 · primary fetch1 sourceupdated Feb 12 · 11:00:00

Introducing GPT-5.3-Codex-Spark—our first real-time coding model. 15x faster generation, 128k context, now in research preview for ChatGPT Pro users.

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openai.comIntroducing GPT-5.3-Codex-Sparkprimary11:00:00