GPT‑5.3‑Codex‑Spark

Codex-Spark offers a transformative coding experience, emphasizing speed and real-time interaction for developers. Key features include: • 15x faster code generation • Expansive 128k context window • Real-time collaborative coding • Interruptible and redirectable responses • Lightweight, targeted code edits Optimized for interactive development, Codex-Spark delivers near-instant responses, making it ideal for scenarios where low latency is critical. Unlike traditional coding models, it allows users to actively guide and modify its output as it's being generated, fostering a highly dynamic and responsive development environment. This platform is designed to seamlessly integrate into existing coding workflows, providing precise and minimal edits to avoid unnecessary complexity. While it can perform tests, this functionality is provided on demand, ensuring that the development process remains lean and user-controlled. Codex-Spark is currently available in research preview for ChatGPT Pro users, making it a powerful asset for software engineers, developers, and programming teams who prioritize velocity and tight feedback loops in their daily coding tasks.