I've been using the on-device Apple foundation model to test out the SoC performance on the iPhone 17 Pro Max and 18 Pro Max
A19 Pro
Long Prompt: 2340ms TTFT, 45 tok/s
Medium Prompt: 946ms TTFT, 70 tok/s
Short Prompt: 638ms TTFT, 100 tok/s
A20 Pro
Long Prompt: 1125ms TTFT, 55 tok/s
Medium Prompt: 437ms TTFT, 71 tok/s
Short Prompt: 354ms TTFT, 150 tok/s