Cerebras Powers Ultrafast Mode for OpenAI’s GPT-5.6 Sol
Rhea-AI Summary
Cerebras (NASDAQ: CBRS) announced that its hardware powers Ultrafast mode, a new OpenAI API tier for GPT-5.6 Sol, delivering up to 750 output tokens per second and up to 14× faster processing than the Standard tier, with the same model intelligence.
According to Cerebras, Ultrafast is initially in limited preview and targets workloads needing very low latency. Reported comparisons indicate Ultrafast runs about 5× faster than Claude Opus 4.8 Fast and 11× faster than Claude Fable 5, and achieves a 5.6× speedup on GDP-Val benchmarks with no measured quality loss.
Positive
- Powers OpenAI GPT-5.6 Sol Ultrafast tier at up to 14× speed
- Supports up to 750 output tokens per second for GPT-5.6 Sol
- Ultrafast about 5× faster than Claude Opus 4.8 Fast mode
- Ultrafast about 11× faster than Claude Fable 5 on output speed
- 5.6× end-to-end speedup on GDP-Val with no quality loss reported
- Wafer-Scale Engine keeps 44 GB of model weights on-chip
Negative
- Ultrafast service initially limited to a small group of customers
News Explained
The limited-preview service uses Cerebras’s Wafer-Scale Engine to keep model weights in 44 GB of on-chip SRAM per wafer-sized chip instead of moving them between on-chip memory and off-chip storage, which the release identifies as the source of its faster inference.
Key Figures
Historical Context
| Date | Event | Sentiment | 24h Move | Catalyst |
|---|---|---|---|---|
| Aug 05 | AI partnership | Positive | -5.7% | Lovable partnership announced to deploy Cerebras inference for latency-sensitive software workflows. |
| Jul 29 | Colocation agreement | Positive | -12.1% | Cerebras signed a long-term data-center colocation agreement with CleanCore Solutions. |
| Jul 22 | Earnings scheduling | Neutral | +4.9% | Cerebras scheduled release of second-quarter 2026 financial results and conference call. |
| Jul 22 | AI partnership | Positive | +0.6% | CrowdStrike deployed Falcon detection models on Cerebras inference infrastructure. |
| Jul 09 | Manufacturing partnership | Positive | +9.3% | Flex expanded manufacturing capacity for Cerebras CS-3 AI supercomputers. |
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Positive partnership and commercial-expansion announcements produced mixed reactions, with two positive outcomes and three divergences in the selected history.
Key Terms
inference technical
sram technical
memory-bandwidth bottleneck technical
on-chip memory technical
AI-generated analysis. How Rhea-AI works. Not financial advice.
Cerebras powers OpenAI's most capable model at up to 14x the speed, giving frontier intelligence with no compromise on latency
SUNNYVALE, Calif., Aug. 13, 2026 (GLOBE NEWSWIRE) -- Cerebras (NASDAQ: CBRS) today 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, enabling frontier intelligence at Cerebras' blistering fast speed.
Every major computing shift has been unlocked by a leap in speed, not just capability: the PC era needed the jump from kilohertz to gigahertz, and the internet needed the move from dial-up to broadband before it could reach everyone. AI is no different. Now that frontier models are demonstrably capable, the next constraint on adoption is how fast they run.
“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 speeds suited to work that cannot wait. 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. In doing so, it opens up a new region of speed-intelligence: frontier intelligence combined with unprecedented speed.
Benchmarks focused on economically valuable work, from programming to drafting legal documents, show how faster token generation translates directly into higher productivity for users.
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. Visit cerebras.ai for more.
Cerebras Disclosure Information
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Forward-Looking Statements
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Cerebras' actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors. Accordingly, undue reliance should not be placed on such statements. These forward-looking statements are made as of the date they were first issued and are based on information available to Cerebras together with Cerebras' expectations, estimates, forecasts, projections, beliefs, and assumptions as of such date. These forward-looking statements should not be relied upon as representing Cerebras' views as of any date subsequent to the date of this press release. Past performance is not necessarily indicative of future results. Cerebras undertakes no intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.
Further information on potential risks that could affect actual results is included in Cerebras' most recent filings with the SEC, including in Cerebras' most recent Quarterly Report on Form 10-Q, copies of which may be obtained by visiting Cerebras' Investor Relations website at investors.cerebras.ai or the SEC's website at www.sec.gov.
Contacts
Kriselle Laran
Media Relations
pr@cerebras.ai
Sean Dorsey
Investor Relations
investors@cerebras.ai
