# OpenAI Unveils GPT-5.3-Codex-Spark: Real-Time Coding AI Now Available

OpenAI announced GPT-5.3-Codex-Spark on Twitter, marking a significant leap in AI-powered coding assistance. The company describes it as their first real-time coding model, now available in research preview exclusively for ChatGPT Pro subscribers.

The new model boasts impressive performance improvements over its predecessors. According to OpenAI, GPT-5.3-Codex-Spark generates code 15 times faster than previous versions, enabling near-instantaneous responses for developers. The model also supports a 128,000-token context window, allowing it to process and understand substantially larger codebases and more complex programming tasks in a single session.

This release represents OpenAI's continued focus on specialized AI tools for software development. Real-time generation means developers