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Source: OpenAI recently began renting Google's TPUs to power ChatGPT, marking its first significant use of non-Nvidia chips; Meta also considered using TPUs (The Information)
https://www.theinformation.com/articles/google-convinces-open…

Google Convinces OpenAI to Use TPU Chips in Win Against Nvidia
OpenAI, one of the world’s biggest customers of Nvidia artificial intelligence chips, recently began renting Google’s AI chips to power ChatGPT and other products, the first time it has used non-Nvidia chips in a meaningful way, according to a person who is involved in the arrangement. The move ...