OpenAI has launched GPT-5.3-Codex-Spark, an ultra-fast artificial intelligence (AI) model designed for real-time software development, marking a shift toward instant, interactive coding workflows as competition intensifies in the AI tools market. The model, a smaller version of its GPT-5.3-Codex system, is being released as a research preview to ChatGPT Pro users and select partners.
According to OpenAI, the system is optimized for near-instant responses when deployed on specialized low-latency hardware. It will deliver more than 1,000 tokens per second under the right configuration, while also defaulting to minimal edits, and will not automatically execute tests unless instructed.
Unlike larger models built for long autonomous tasks, Codex-Spark is tuned for rapid iteration, editing code, refining logic, and responding immediately to user input.
“Codex-Spark is our first model designed specifically for working with Codex in real-time—making targeted edits, reshaping logic, or refining interfaces and seeing results immediately,” the company said.
The system supports both quick interactions and more complex projects, allowing engineers to intervene, redirect, or interrupt output as it is generated. OpenAI said the model keeps its working style lightweight by default, making minimal edits and skipping automated tests unless requested.
Codex-Spark is also the first milestone in OpenAI’s partnership with chipmaker Cerebras, announced in January.
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