OpenAI built a chip in nine months. Then it let AI rewrite the code.

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When OpenAI unveiled Jalapeño, its first custom inference chip, in June, the company made some big promises. The chip, developed with Broadcom, was built from scratch for large language model inference, with OpenAI saying early testing showed substantially better performance per watt than existing accelerators. At the time, though, OpenAI didn’t release the detailed performance results to back that up.

On Tuesday, OpenAI published its first results from working Jalapeño silicon across GPT-OSS 120B, DeepSeek R1 and Kimi K2.5. The results show what OpenAI was aiming for with Jalapeño: higher throughput without the longer response times that can come with it.

“Agents need to complete many steps in sequence, so delays can compound across an entire task.”

Agents compound inference delays

An agent may call a model over and over as it works through a task, using tools and deciding what to do next based on the results, which means a delay that barely registers during a single inference can become much more noticeable when it happens repeatedly over the course of a longer task.

“Agents need to complete many steps in sequence, so delays can compound across an entire task,” OpenAI said.

Jalapeño was designed with those delays in mind. Different parts of running a large language model place different demands on the hardware, with the initial prompt requiring more compute and the response generation putting more pressure on memory bandwidth. Every time data has to move between cores and chips, that can add even more waiting.

Jalapeño takes a different approach, cutting down on …

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