If you have an M1/M2/M3/M4 Mac, you can run real LLMs entirely on-device — no API keys, no cloud bills, and no prompts leaving your machine. Two tools dominate on Apple Silicon: MLX (Apple's own ML framework) and llama.cpp (the portable C++ engine). Here's how to get MLX running in five minutes, and when to pick which.

Why run local on a Mac?

Privacy: your prompts never leave the laptop.

Cost: $0 per token after the hardware you already own.

Offline: works on a plane, in a cabin, anywhere.