OpenAI's new GPT‑5.3‑Codex‑Spark is 15 times faster at coding than its predecessor.

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OpenAI released GPT-5.3-Codex-Spark, its first production AI model running on Cerebras chips instead of Nvidia hardware. The coding model delivers over 1,000 tokens per second—roughly 15 times faster than its predecessor—and is available to ChatGPT Pro subscribers ($200/month). Built for speed over depth, Spark is a text-only model tuned specifically for coding tasks with a 128,000-token context window. The release represents a significant performance leap over OpenAI's previous models on Nvidia infrastructure, which typically deliver 50-167 tokens per second.

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