OpenAI built its own inference chip with Broadcom
OpenAI and Broadcom unveiled Jalapeño on 24 June, OpenAI's first custom chip. It is an inference processor, built to run trained models rather than train them, and OpenAI says it targets better performance per watt and lower running costs than the general-purpose GPUs it depends on today. The launch lands as rivals Amazon and Google push their own silicon to cut their reliance on Nvidia.
The detail: Per OpenAI and Broadcom's joint announcement, OpenAI designed the accelerator while Broadcom supplied the silicon and networking and Celestica builds the boards, racks and systems. OpenAI says it went from design to tape-out in nine months, which it calls the fastest ASIC development cycle yet in advanced semiconductors, and that engineering samples are already running its own workloads in the lab, including a model it names GPT-5.3-Codex-Spark. Early testing shows performance per watt "substantially better" than current hardware, though OpenAI says final performance is still being measured, with a technical report to follow. Broadcom's chief executive, Hock Tan, said the platform will deploy at gigawatt scale with Microsoft and other partners. The design work was itself sped up using OpenAI's models, and Tom's Hardware describes the part as a reticle-sized ASIC.
Related: The move extends a pattern Pulse24 has tracked, of large buyers building around Nvidia rather than only buying from it. The pressure behind it is supply: days earlier, Google restricted Meta's access to Gemini over compute capacity, and Micron warned the chip shortage will run past 2027. The caveat is execution. Jalapeño is not in production, OpenAI targets first deployment only at the end of 2026, and custom-silicon programmes often slip between tape-out and volume.