GPT-5.3-Codex-Spark is OpenAI's first AI model to run on chips from Nvidia rival Cerebras; OpenAI says Codex has more than 1M weekly active users (Rachel Metz/Bloomberg)

Rachel Metz / Bloomberg: GPT-5.3-Codex-Spark is OpenAI's first AI model to run on chips from Nvidia rival Cerebras; OpenAI says Codex has more than 1M weekly active users   —  OpenAI is releasing its first artificial intelligence model that runs on chips from semiconductor startup Cerebras Systems Inc. …