text model · Phi-4 · iOS

Can I run Phi-4-reasoning on iPhone 16 Pro?

Compatibility verdict VRAM threshold engine

No, not enough memory would not load

No. Phi-4-reasoning needs ~10.1 GB even at Q4_K_M, but iPhone 16 Pro only has ~4.5 GB usable.

Needs ~10.1 GB Device usable ~4.5 GB

Needs ~10.1 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 5.6 GB: Phi-4-reasoning needs roughly 10.1 GB at Q4_K_M and iPhone 16 Pro leaves only about 4.5 GB usable for a model. The lightest tracked hardware that runs Phi-4-reasoning is the Nvidia GeForce RTX 3060 (12GB) at 12 GB. See Phi-4-reasoning on Nvidia GeForce RTX 3060 (12GB).

Q4_K_M needed: ~10.1 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

~7.6 GB

Q3_K_M

~8.5 GB

Q4_K_M

~10.1 GB

Q5_K_M

~11.7 GB

Q6_K

~13.2 GB

Q8_0

~16.2 GB

FP16

~31 GB

The line marks iPhone 16 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 Phi-4

Parameters: 14B
Q4_K_M size: 8.43 GB
Q8_0 size: 14.51 GB
Context: 32k
Ollama tag: phi4-reasoning:14b

Full Phi-4-reasoning requirements →

Device iOS

Memory: 8 GB unified
Usable for weights: ~4.5 GB
Power draw: ~12 W
Best runtime: llama.cpp + Metal (via PocketPal or Off Grid app)

Best models for iPhone 16 Pro →

What you can run instead

Run Phi-4-reasoning on other hardware

Nvidia GeForce RTX 3060 (12GB)Nvidia GeForce RTX 4070 (12GB)Apple M2 (16GB)Apple M4 (16GB)Nvidia GeForce RTX 4060 Ti (16GB)Nvidia GeForce RTX 4080 (16GB)

FAQ

Can iPhone 16 Pro run Phi-4-reasoning?

No. Phi-4-reasoning needs ~10.1 GB even at Q4_K_M, but iPhone 16 Pro only has ~4.5 GB usable.

How much memory does Phi-4-reasoning need?

iPhone 16 Pro does not have enough memory. At Q4_K_M the weights are ~8.43 GB; with KV cache and runtime overhead, budget ~10.1 GB at a 4k context.

What is the best tool to run Phi-4-reasoning 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

[![Phi-4-reasoning on iPhone 16 Pro](https://localmodel.run/badge/phi-4-reasoning/iphone-16-pro.svg)](https://localmodel.run/can-i-run/phi-4-reasoning/iphone-16-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.