Cerebras Powers OpenAI’s GPT-5.6 Sol Ultrafast Mode
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Off the Wire Press Releases SUNNYVALE, Calif., Aug. 14, 2026 — Cerebras has announced that it is powering Ultrafast mode, a new service tier in the OpenAI API for GPT-5.6 Sol. Available initially in limited preview to OpenAI customers, Ultrafast runs GPT-5.6 Sol at up to 750 output tokens per second and up to 14× faster than Standard processing. GPT-5.6 Sol Ultrafast powered by Cerebras runs with the same intelligence as GPT-5.6 Sol Standard, according to the company, combining GPT-5.6 Sol’s capabilities with higher inference speeds. “GPT-5.6 Sol on Ultrafast is proof that speed and intelligence are no longer mutually exclusive,” said Andrew Feldman, CEO and co-founder, Cerebras. “Together with OpenAI, we’re putting frontier intelligence in the hands of users at unprecedented speed and changing what’s possible with AI.” “By combining GPT-5.6 Sol with Cerebras’ inference technology, we’re exploring what becomes possible when customers can get the intelligence of our most capable models with significantly lower latency. We’re starting with a small group of customers to learn where that speed creates meaningful value, and we’ll use those learnings to inform how we expand the service over time,” said Sachin Katti, VP Compute Strategy & GPT-Infra at OpenAI. A New Speed-Intelligence Frontier Until now, organizations needed to choose between the capabilities of larger models and the faster response times of smaller models. Ultrafast powered by Cerebras offers access to the full intelligence of GPT-5.6 Sol at higher inference speeds. Based on output speeds for Anthropic models reported by Artificial Analysis, Ultrafast is 5x faster than Claude Opus 4.8 in Fast mode, and 11x faster than Claude Fable 5. The company said the results combine frontier-model capabilities with higher inference speeds. Benchmarks focused on economically valuable work, from programming to drafting legal documents, illustrate how faster token generation can affect completion times for various tasks. On Humanity’s Last Exam, a 2,500-question benchmark spanning graduate-level chemistry, economics and literature, GPT-5.6 Sol Ultrafast answered the full question set in just over 11 hours. This compares to more than three days of continuous compute for Claude Fable 5, with GPT-5.6 Sol Ultrafast reaching comparable accuracy nearly 7x faster. On GDP-Val, a benchmark of economically valuable knowledge-work tasks such as legal briefs, financial models, and engineering reports, Ultrafast delivered a 5.6x end-to-end speedup with no loss in quality. Ultrafast’s speed comes from Cerebras’ Wafer-Scale Engine architecture, which keeps model weights on-chip — 44 GB of SRAM on each wafer-sized chip — rather than shuttling them between on-chip memory and off-chip storage as GPU-based inference must. This eliminates the memory-bandwidth bottleneck that constrains frontier-model inference speed on conventional hardware. To get notified when capacity expands to more customers, please visit the Cerebras website. About Cerebras Systems Cerebras Systems (NASDAQ: CBRS) builds the world’s fastest AI infrastructure. The Cerebras team of pioneering computer architects, computer scientists, AI researchers, and engineers of all types came together to make AI blisteringly fast through innovation and invention. We believe that when AI is fast, it will change the world. Leading global corporations, research institutes, and governments choose Cerebras to run their AI workloads. Cerebras solutions are available on premises and in the cloud. Source: Cerebras
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