GPT-5.3-Codex-Spark deprecated

GPT-5.3-Codex-Spark was deprecated on September 14, 2026. The research preview is no longer available in the ChatGPT desktop app, Codex CLI, or IDE extension.

Switch to one of the recommended models, and update saved configurations, custom agents, and scripts that select gpt-5.3-codex-spark.

For faster responses with a supported model, see Fast mode.