NVIDIA Blackwell GPUs power OpenAI's GPT-6 Astra Ultrafast mode in API

GPT-6 Astra Ultrafast, running on NVIDIA Blackwell GPUs, is now available in the OpenAI API and to eligible ChatGPT Work and Codex users. The source says Ultrafast offers up to 8x faster token generation than Astra Standard mode, which can shorten coding agents' response times between tool calls. OpenAI also says it uses its own models to keep optimizing inference software on NVIDIA GPUs after deployment.