Tweet by PatrickToulme
June 24, 2026
A few thoughts on OpenAI's Jalapeño chip announcement today: 1. This chip is most likely the first one virtually entirely developed by Codex/GPT. Codex with whatever internal coding model (GPT 5.6/6.0 whatever) coded the entire software stack and most likely the hardware design 2. OpenAI will write all of their inference serving in pure Jalapeño ISA (instruction set architecture). Why? They only need to get say a few production models serving on Jalapeño. They can handwrite with Codex the entire model in pure ISA to get very high performance 3. They are most likely running Codex/GPT in custom RL envs to teach the models direct Jalapeño chip programming at ISA level 4. This is a massive cost savings for OpenAI and only possible IMO due to the breakthroughs in agentic coding. An AI company with frontier coding models can now become a hardware vendor with only a small team of experienced SWEs and an infinite amount of tokens This is the first chip program fully accelerated by frontier AI.
- Author
- PatrickToulme
- Date
- June 24, 2026
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- /tweets/patricktoulme-2069857412660801738-61f22b