Device: iPhone 15 Pro
Category: iphone
Memory: 8 GB (unified), usable for models: 4.5 GB
Memory bandwidth: 51.2 GB/s
MSRP (USD): 999
TDP: 14 W
Best runtime: llama.cpp + Metal (via PocketPal or Off Grid app)
Notes: 8GB LPDDR5 unified memory confirmed via TechInsights teardown (Micron D1b LPDDR5 chips) and GSMArena. iOS reserves ~3-4GB for OS+system, leaving ~4-4.5GB usable for model weights (community estimate). Practical ceiling 1B-3B Q4_K_M on-device; Apple Intelligence models (Llama 3B class) run at ~3-4GB. CoreML path most memory-efficient but slowest gen speed; llama.cpp+Metal gives best throughput. Benchmarks for on-device LLM cite iPhone 15 Pro achieving ~20-30 tok/s on 3B Q4 models.