Cerebras Systems CEO Andrew Feldman confirmed that OpenAI’s GPT-5.4 model is now running on Cerebras hardware, with plans to bring GPT-5.5 onto the platform. The OpenAI-Cerebras relationship was formalized on January 14, 2026, with a multibillion-dollar agreement reportedly exceeding $10 billion, covering up to 750 MW of compute capacity over a three-year window through 2028 or 2029. The first major milestone came on February 12, 2026, when the GPT-5.3-Codex-Spark model launched on Cerebras hardware, clocking in at over 1,000 tokens per second. Cerebras completed its IPO in May 2026 with a market capitalization reported between $63 billion and $95 billion. The 750 MW compute capacity commitment through 2028/2029 represents a multi-year revenue floor for Cerebras, though a deal exceeding $10 billion with a single customer means Cerebras’ fortunes are heavily tied to OpenAI’s trajectory.