TLDR
Apple AI with ChatGPT backup: "summarize the pre and post 2024 in a sentence"
**Pre-2024 (and up to its training cutoff):** The LLM has deeply internalized the knowledge into its parameters, enabling rich, fluent, and well-connected reasoning as if it's part of its "brain."
**Post-2024:** It relies on real-time web search to fetch information and then reasons over that external data in a more consultative, shallower, and less integrated way.