Cerebras launches the CS-4, its first multi-wafer system, though the chip inside is not new
Cerebras has put three of its dinner-plate-sized processors into a single rack for the first time. The CS-4, unveiled on Tuesday at the company’s Supernova event and shipping this quarter, is pitched as an inference machine for frontier models, and Cerebras says it runs them up to 30 times faster than GPU-based systems.
The launch lands five days after OpenAI’s Ultrafast mode, which runs GPT-5.6 Sol roughly 14 times faster on Cerebras silicon, went live. It is also the first hardware the company has shipped since its $5.55bn Nasdaq debut in May, the largest US tech listing since Snowflake.
On paper the system is formidable. Each CS-4 carries three WSE-3 Turbo wafers for a combined 750 petaflops of sparse FP16 compute, 129.6 petabytes per second of memory bandwidth, and support for models above 50 trillion parameters.
Wafer-to-wafer latency falls to two microseconds from five, and the rack uses half...
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