text model · Qwen2.5 · iOS

Can I run Qwen2.5 72B on iPhone 15 Pro?

Compatibility verdict VRAM threshold engine

No, not enough memory would not load

No. Qwen2.5 72B needs ~50.2 GB even at Q4_K_M, but iPhone 15 Pro only has ~4.5 GB usable.

Needs ~50.2 GB Device usable ~4.5 GB

Needs ~50.2 GB even at Q4_K_M, but only ~4.5 GB is usable.

That figure is at a 4k context and moves about ±15% as context length changes.

The gap is about 45.7 GB: Qwen2.5 72B needs roughly 50.2 GB at Q4_K_M and iPhone 15 Pro leaves only about 4.5 GB usable for a model. The lightest tracked hardware that runs Qwen2.5 72B is the Apple M4 Max (128GB) at 128 GB. See Qwen2.5 72B on Apple M4 Max (128GB).

Q4_K_M needed: ~50.2 GB
Usable on device: ~4.5 GB
Device memory: 8 GB

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Which quant fits

Quant ladder vs ~4.5 GB usable

Q2_K

~33 GB

Q3_K_M

~38 GB

Q4_K_M

~50.2 GB

Q5_K_M

~54.1 GB

Q6_K

~61.8 GB

Q8_0

~80.1 GB

FP16

~146.8 GB

The line marks iPhone 15 Pro's ~4.5 GB budget; rungs past it are too large.

How to run it

On iOS use Apple Foundation Models (Built into iOS 26, ~3B on-device model, zero download, fully private.).

Model Qwen2.5

Parameters: 72B
Q4_K_M size: 47.42 GB
Q8_0 size: 77.26 GB
Context: 128k
Ollama tag: qwen2.5:72b

Full Qwen2.5 72B requirements →

Device iOS

Memory: 8 GB unified
Usable for weights: ~4.5 GB
Power draw: ~14 W
Best runtime: llama.cpp + Metal (via PocketPal or Off Grid app)

Best models for iPhone 15 Pro →

What you can run instead

Run Qwen2.5 72B on other hardware

Apple M4 Max (128GB)AMD Ryzen AI Halo (128GB)Apple M5 Max (128GB)Apple M3 Ultra (256GB)

FAQ

Can iPhone 15 Pro run Qwen2.5 72B?

No. Qwen2.5 72B needs ~50.2 GB even at Q4_K_M, but iPhone 15 Pro only has ~4.5 GB usable.

How much memory does Qwen2.5 72B need?

iPhone 15 Pro does not have enough memory. At Q4_K_M the weights are ~47.42 GB; with KV cache and runtime overhead, budget ~50.2 GB at a 4k context.

What is the best tool to run Qwen2.5 72B on iOS?

On iPhone and iPad, Apple Foundation Models (Built into iOS 26, ~3B on-device model, zero download, fully private.) is the standard choice. Phones realistically run 1B-4B class models. Anything larger thermally throttles or OOMs.

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Markdown

[![Qwen2.5 72B on iPhone 15 Pro](https://localmodel.run/badge/qwen2.5-72b/iphone-15-pro.svg)](https://localmodel.run/can-i-run/qwen2.5-72b/iphone-15-pro)

Sources

Weights are measured from GGUF files; KV cache and overhead are computed, so totals can vary ~15% with context and runtime. Any tok/s is a bandwidth estimate. See methodology.