https://arstechnica.com/gadgets/2023/07/report-apple-has-already-built-its-own-chatgpt-like-chatbot/

Apple has built its own large language model (LLM) AI framework and associated chatbot service similar to OpenAI's ChatGPT, Google's Bard, and Microsoft's ChatGPT-based Bing Chat, according to a new report.

The project is codenamed "Ajax" internally, the sources say, though some engineers within the company colloquially refer to it as "Apple GPT." It is built on top of Google machine learning framework Jax and runs on Google Cloud.