Can Yi 1.5 6B run on MacBook Pro M3 Pro 18GB?

YES — Runs Great

C51Usable

○Estimated from fit model

Yi 1.5 6B needs ~7.5 GB VRAM. MacBook Pro M3 Pro 18GB has 13.0 GB. With Q4_K_M quantization, expect ~33 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) — 7.5 GB, 32.5 tok/s, Runs well

7.5 GB required13.0 GB available

58% VRAM used

Fit status

Runs well

Decode

32.5 tok/s

TTFT

5950 ms

Safe context

Memory

7.5 GB / 13.0 GB

Memory breakdown

Weights3.7 GB

KV Cache1.0 GB

Runtime0.9 GB

Headroom1.9 GB

See how fast it feels

See how fast it feelsYi 1.5 6B on MacBook Pro M3 Pro 18GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.

When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.

Key benefits of running locally:
 - Full privacy: your prompts never leave your machine
 - No per-token cost or rate limits
 - Works offline once the model is downloaded
 - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:

 Model size Q4 (4-bit) Q8 (8-bit) FP16
 7B params ~4.3 GB ~7.5 GB ~14 GB
 13B params ~7.9 GB ~13.9 GB ~26 GB
 70B params ~42.7 GB ~74.9 GB ~140 GB

Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 32.5 tok/s decode · 6.0s TTFT (warm) · 81 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	C	Runs well	32.5 tok/s	3246 ms	4K
Coding	C	Runs well	32.5 tok/s	5950 ms	4K
Agentic Coding	C	Runs well	32.5 tok/s	8655 ms	4K
Reasoning	C	Runs well	32.5 tok/s	7032 ms	4K
RAG	C	Runs well	32.5 tok/s	10819 ms	4K

Quantization options

How Yi 1.5 6B (6B params) fits at each quantization level on MacBook Pro M3 Pro 18GB (13.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.3 GB	Low	C48
Q3_K_S	3	2.9 GB	Low	C48
NVFP4	4	3.4 GB	Medium	C49
Q4_K_M	4	3.7 GB	Medium	C49
Q5_K_M	5	4.3 GB	High	C50
Q6_K	6	4.9 GB	High	C51
Q8_0Best for your GPU	8	6.4 GB	Very High	C52
F16	16	12.3 GB	Maximum	F0

Get started

Copy-paste commands to run Yi 1.5 6B on your machine.

Run

lms load Yi-1.5-6B-Chat && lms server start

Upgrade options

Hardware that runs Yi 1.5 6B well

👁 NVIDIA
RTX 5060 Ti 16GBBudget pick

448 GB/s (+298)

Raises estimated decode speed by about 154%.82.5 tok/s decode

Raises estimated decode speed by about 154%.

Adds memory headroom for longer context windows and future model growth.

~$449 MSRP

RX 9070 16GBBest value

640 GB/s (+490)

Raises estimated decode speed by about 158%.84 tok/s decode

Raises estimated decode speed by about 158%.