LOCAL AI ON A MAC
Unified memory lets a MacBook run surprisingly big AI models. The trick is picking enough of it.
AllInfo AI
THE SECRET
The CPU, GPU and Neural Engine share unified memory, so the GPU can use most of your RAM for AI.
RULE OF THUMB
At 4 bit, a model needs about 0.5 to 0.6 GB per billion parameters, plus room for chat and macOS.
16 GB
Runs small models up to about 8B, plus Apple Intelligence. Good for students trying local AI.
24 TO 32 GB
The MacBook Air M5 tops out at 32 GB and handles many 14B to 30B models with ease.
64 GB AND 128 GB
M5 Pro reaches 64 GB. The top M5 Max with 128 GB runs 70B models comfortably, even on battery.
KNOW THE LIMITS
Some AI tools need Nvidia CUDA. If a model fits in 24 GB, an RTX 5090 laptop is usually faster.
PRICES IN 2026
MacBook Air M5 starts at $1,299 in the US. 128 GB needs the 40 core M5 Max, from $4,699.