OpenAI GPT-6 Astra Ultrafast is available through the API on NVIDIA Blackwell GPUs, offering up to 8× Astra Standard’s token-generation speed.

NVIDIA’s announcement says GPT-6 Astra Ultrafast is available through the OpenAI application programming interface (API). Access also extends to eligible ChatGPT Work and Codex users.

The service runs on NVIDIA Blackwell GPUs. NVIDIA attributes the acceleration to inference optimizations in OpenAI’s models that use capabilities of the Blackwell architecture.

The performance claim is up to eight times faster token generation than Astra Standard mode. That comparison does not establish an eightfold improvement in end-to-end task completion or time to first token, and the supplied excerpt provides no absolute token rate, pricing, or benchmark conditions.