Apple CEO Tim Cook on stage on Monday 
AAPL The company announced a splashy deal with OpenAI to incorporate the company's powerful artificial intelligence models as part of its voice assistant, Siri.
But in technical documents released by Apple after the event, Alphabet Inc.'s Google said 
Google It emerges as the Cupertino, California-based company plays catch-up in the AI space.
To build Apple's underlying AI models, the company's engineers used its own framework software and a variety of hardware, specifically its own on-premise graphics processing units (GPUs) and chips called tensor processing units (TPUs), which are only available in Google's cloud.
Google has been developing its TPUs for about a decade and has publicly discussed two flavors of its fifth-generation chips that could be used for AI training: a performance version of the fifth generation that would offer performance comparable to Nvidia's; 
NVDA According to Google, it's the H100 AI chip.
At its annual developers conference, Google announced that the sixth generation will be released this year.
These processors are specifically designed to run AI applications and train models, and Google has built its cloud computing hardware and software platform around them.
Apple and Google did not immediately respond to requests for comment.
Apple did not say how much it relies on Google's chips and software, versus hardware from Nvidia or other AI vendors.
But to use Google's chips, customers typically have to buy access to them through Amazon.com's cloud division. 
Amazon AWS or Microsoft 
MSFT Azure.
