OpenAI releases research preview of GPT-5.3-Codex-Spark for real-time coding
Introducing GPT-5.3-Codex-Spark
AI summary
OpenAI released GPT-5.3-Codex-Spark research preview, a smaller version of GPT-5.3-Codex and its first model designed for real-time coding. It is based on Cerebras' Wafer Scale Engine 3, with inference speed over 1000 tokens/s, 128k context window, and text-only, available to ChatGPT Pro users. OpenAI says it performs strongly on SWE-Bench Pro and Terminal-Bench 2.0 with much less time than GPT-5.3-Codex, and evaluations suggest it is unlikely to reach the Preparedness Framework's high capability thresholds in cybersecurity or biology.