Introducing GPT-5.3-Codex-Spark

GPT-5.3-Codex-Spark has been released as a real-time coding model, featuring a 15x increase in generation speed and a context length of 128k tokens. Currently in research preview for ChatGPT Pro users, this model aims to enhance coding efficiency and support larger codebases. Its advancements are significant for practitioners focused on developing applications that require rapid code generation and handling extensive context.