Previewing Ultrafast mode: GPT‑5.6 Sol at up to 14X the speed

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Today we’re previewing Ultrafast mode, a new service tier in the OpenAI API for GPT‑5.6 Sol. Powered by Cerebras, Ultrafast runs up to 14x faster than Standard processing and generates up to 750 output tokens per second. OpenAI technical staff are already seeing what that speed changes. One security investigation workflow that once took one to two hours now takes 10–15 minutes, sometimes approaching real time. In other workflows, staff use Ultrafast to investigate root causes, search systems in parallel, and stay in flow while coding. Ultrafast is available to a select group of API customers, with access expanding as capacity grows. Learn more: https://openai.com/index/previewing-ultrafast/

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