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OpenAI acquired 4.2% of Cerebras before GPT-5.6 Ultrafast launch

RuntimeWire found that OpenAI acquired a 4.2% economic stake in Cerebras weeks before launching Cerebras-powered GPT‑5.6 Ultrafast.

By RuntimeWire Staff · Published Aug 13th, 2026, 2:12pm CT · Updated Aug 13th, 2026, 3:04pm CT

Illustration of stacks of corporate documents revealing OpenAI's 4.2% economic stake in Cerebras next to a reference to GPT-5.6 Ultrafast.

RuntimeWire found that OpenAI acquired a 4.2% economic stake in Cerebras weeks before launching Cerebras-powered GPT‑5.6 Ultrafast.

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