Can Qwen 3.5 4B run on iPhone 16 Pro?
YES — Runs great
Grade A · 82/100 · formula estimate
What this means
Our estimate says Qwen 3.5 4B should fit comfortably on your iPhone 16 Pro.
Download the Q4_K_M version, which is about 2.7 GB. We expect it to use about 3.7 GB of the roughly 5.2 GB available to a model on this phone.
At the estimated speed, a roughly 300-word answer may take about 40 seconds to finish.
This result is calculated from the phone and model specifications. It has not been measured on this exact phone and setup.
10tokens/s
estimated · faster than you read
3.7GB
needed at Q4_K_M
Q4_K_M
quant checked
A
grade · 82/100
needs 3.7 GBusable 5.2 GB
Apple A18 Pro8 GB RAMMetal
See how fast it feels
Estimated at 10 tokens/s — faster than you read. A ~300-word reply takes about 40 seconds on this phone.
Where the memory goes
| Component | Detail | GB |
|---|---|---|
| Model weights | Q4_K_M GGUF (2.7 GB) + mmap overhead | 2.8 |
| KV cache | 4K context window | 0.3 |
| Runtime | llama.cpp + app overhead | 0.6 |
| Total needed | at Q4_K_M, 4K context | 3.7 |
| Usable on iPhone 16 Pro | 8 GB RAM − iOS reserve (jetsam limit) | 5.2 |
| Headroom | left for the OS and your other apps | 1.5 |
Pick your quant
| Quant | Download | Verdict | Speed |
|---|---|---|---|
| Q3_K_M | 2.3 GB | ✓ Runs great | ~11.7 tokens/s |
| IQ4_XS | 2.5 GB | ✓ Runs great | ~10.8 tokens/s |
| Q4_0 | 2.6 GB | ✓ Runs great | ~10.4 tokens/s |
| Q4_K_S | 2.6 GB | ✓ Runs great | ~10.4 tokens/s |
| Q4_K_M BEST HERE | 2.7 GB | ✓ Runs great | ~10 tokens/s |
| Q5_K_M | 3.1 GB | ✓ Runs great | ~8.7 tokens/s |
| Q6_K | 3.5 GB | ! Runs, barely | ~7.7 tokens/s |
| Q8_0 | 4.5 GB | ✕ Won't fit | won't fit |
Get it running in 3 steps
1
Install PocketPal from the App Store — free, no account needed.
2
Download "Qwen 3.5 4B Q4_K_M" in the in-app model hub — 2.7 GB, use Wi-Fi. Search Hugging Face for
unsloth/Qwen3.5-4B-GGUF and pick the Q4_K_M file.3
Set context to 4K and enable Metal — expect ~10 tokens/s on this phone.
Related checks
MORE ON IPHONE 16 PRO
QWEN 3.5 4B ON OTHER PHONES