Can Qwen 3.5 4B run on MacBook Pro M4 32GB?

Q: Is unified memory on MacBook Pro M4 32GB as fast as VRAM for Qwen 3.5 4B?

Not always. MacBook Pro M4 32GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.

YES — Runs Great

S87Excellent

Estimated — low-sample bucket· few comparable runs

Qwen 3.5 4B needs ~9.0 GB VRAM. MacBook Pro M4 32GB has 23.0 GB. With Q4_K_M quantization, expect ~35 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: Very lowStack: StandardBottleneck: Memory bandwidth

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 9.0 GB, 35.0 tok/s, Runs well

9.0 GB required23.0 GB available

39% VRAM used

Fit status

Runs well

Decode

35.0 tok/s

TTFT

5528 ms

Safe context

118K

Memory

9.0 GB / 23.0 GB

Memory breakdown

Weights2.4 GB

KV Cache2.2 GB

Runtime0.9 GB

Headroom3.5 GB

See how fast it feels

See how fast it feelsQwen 3.5 4B on MacBook Pro M4 32GB
1st promptCold start — includes initialization
>Write a Python function to sort a list
Here's a Python function that sorts a list using quicksort:

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

# Example usage
numbers = [3, 6, 8, 10, 1, 2, 1]
print(quicksort(numbers))  # [1, 1, 2, 3, 6, 8, 10]

The algorithm picks a pivot, partitions the list into smaller, equal, and larger elements, then recursively sorts each partition and concatenates the results.
2nd promptWarm — model ready, no init overhead
>Now add type hints and a docstring
def quicksort(arr: list[int]) -> list[int]:
    """Sort a list using the quicksort algorithm.

    Args:
        arr: List of integers to sort.

    Returns:
        A new sorted list.
    """
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

Added type hints for the input and return type, plus a Google-style docstring.
Estimated: 35.0 tok/s decode · 5.5s TTFT (warm) · 88 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Shared-memory contention still exists

The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	S	Runs well	35.0 tok/s	3015 ms	118K
Coding	S	Runs well	35.0 tok/s	5528 ms	118K
Agentic Coding	S	Runs well	35.0 tok/s	8041 ms	118K
Reasoning	S	Runs well	35.0 tok/s	6533 ms	118K
RAG	S	Runs well	35.0 tok/s	10051 ms	118K

Quantization options

How Qwen 3.5 4B (4B params) fits at each quantization level on MacBook Pro M4 32GB (23.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	A84
Q3_K_S	3	2.0 GB	Low	A84
NVFP4	4

Get started

Copy-paste commands to run Qwen 3.5 4B on your machine.

Run

ollama run qwen3.5:4b

Your hardware

More models your MacBook Pro M4 32GB can run

Model	Params	Grade	Decode	Capabilities
Qwen3-Coder 30B A3B Instruct	30.5B	A	11.7 tok/s
Qwen 3.5 27B	27B	S	8.6 tok/s

Frequently asked questions

Can MacBook Pro M4 32GB run Qwen 3.5 4B?

Yes, MacBook Pro M4 32GB can run Qwen 3.5 4B with a S grade (Runs well). Expected decode speed: 35.0 tok/s.

How much VRAM does Qwen 3.5 4B need?

Qwen 3.5 4B (4B parameters) requires approximately 9.0 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 3.5 4B?

The recommended quantization for Qwen 3.5 4B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 3.5 4B run at on MacBook Pro M4 32GB?

On MacBook Pro M4 32GB, Qwen 3.5 4B achieves approximately 35.0 tokens per second decode speed with a time-to-first-token of 5528ms using Q4_K_M quantization.

Can MacBook Pro M4 32GB run Qwen 3.5 4B for coding?

For coding workloads, Qwen 3.5 4B on MacBook Pro M4 32GB receives a S grade with 35.0 tok/s and 118K context.

What context window can Qwen 3.5 4B use on MacBook Pro M4 32GB?

On MacBook Pro M4 32GB, Qwen 3.5 4B can safely use up to 118K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

Is unified memory on MacBook Pro M4 32GB as fast as VRAM for Qwen 3.5 4B?

See all results for MacBook Pro M4 32GB See all hardware for Qwen 3.5 4B

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