GPT-5.3-Codex-Spark
Released
GPT-5.3-Codex-Spark is an AI model released by OpenAI on Thursday, Feb 12 2026, 7 days after GPT-5.3-Codex. It has a 128k token context window.
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Frequently asked questions
GPT-5.3-Codex-Spark was released by OpenAI on Thursday, Feb 12 2026.
GPT-5.3-Codex-Spark was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
GPT-5.3-Codex-Spark has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.
No. GPT-5.3-Codex-Spark is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
OpenAI's previous tracked release was GPT-5.3-Codex on Feb 5 2026, 7 days earlier. It was followed by GPT-5.4 on Mar 5 2026.