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Introducing GPT-5.3-Codex-Spark
February 12, 2026
OpenAI introduced GPT-5.3-Codex-Spark, its first real-time coding model, with 15x faster generation and a 128k context window, now available in research preview for ChatGPT Pro users. It matters because the speed boost and large context make it better suited for interactive coding workflows and longer codebases.
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.
Source: openai.com