At Hot Chips 2026, Cerebras detailed its CS-4 rack-scale system, which houses three WS-3T wafer-scale engines in self-contained Nexus "backpack" modules integrating power, cooling, and networking. Cerebras says the design doubles power delivery to the wafer, yielding up to twice the performance of the WS-3. The company also revealed that CS-6, two generations out, will stack DRAM atop its logic wafer. CS-4 currently powers services like OpenAI's ChatGPT-5.6 Sol Ultrafast tier.
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