How much VRAM does SmolLM2-135M need?

Q4_K_M is exactly 105,453,568 bytes (0.10 GiB) in weights. Add the KV cache, which depends on context length, plus roughly half a gigabyte of runtime overhead.

How large is SmolLM2-135M's KV cache?

0.70 GiB at 32K context with an f16 cache, computed per layer from the model's architecture. Quantizing the cache to q8_0 roughly halves it.

HuggingFaceTB · text

SmolLM2-135M

HuggingFaceTB/SmolLM2-135M

SmolLM2-135M at Q4_K_M is exactly 105,453,568 bytes (0.10 GiB / 0.11 GB) — an effective 6.272 bits per weight, not the nominal 4. Its KV cache at 32K is 0.70 GiB.

From the file· summed from 1 file(s)From the file· KV per layer

Parameters

135M

Architecture

llama

30 layers

Context

8,192

native (config.json)

License

creativeml-openrail-m

Shipped quantizations

● exact bytes, summed from published files

Quant	Size●	Exact bytes●	Effective bpw●	Tensors●	Publisher
Q4_K_M	0.10 GiB	105,453,568	6.272	—	prithivMLmods
Q5_K_M	0.10 GiB	112,102,912	6.667	—	prithivMLmods
Q8_0	0.13 GiB	144,810,496	8.612	—	prithivMLmods
F16	0.25 GiB	270,885,376	16.110	—	prithivMLmods

KV cache by context

computed per layer

Context	KV cache (f16)●	Flat formula	Overstated by	Full / windowed / recurrent
4,096	0.09 GiB	0.09 GiB	—	30 / 0 / 0
8,192	0.18 GiB	0.18 GiB	—	30 / 0 / 0
16,384	0.35 GiB	0.35 GiB	—	30 / 0 / 0
32,768	0.70 GiB	0.70 GiB	—	30 / 0 / 0
65,536	1.41 GiB	1.41 GiB	—	30 / 0 / 0
131,072	2.81 GiB	2.81 GiB	—	30 / 0 / 0

Compare with

same modality, comparable size

vs ced-base vs Qwen3-0.6B vs SmolLM2-135M-Instruct vs gemma-3-270m-it vs tinygemma3_cifar vs LFM2.5-230M All alternatives →Will it fit on my card? →

Why other calculators give a different number

A parameters × bits ÷ 8 estimate puts Q4_K_M at roughly 0.07 GiB. The real file is 0.10 GiB, because a quantization is a mixture and some tensors are always kept at higher precision.

Architecture

from config.json

Layers

Attention heads

KV heads

Head dim

Hidden size

576

Vocab

49,152

Sliding window

none

SWA period

—

MLA

Experts

—

Experts per token

—

use_sliding_window

—

Questions people ask

How much VRAM does SmolLM2-135M need?: Q4_K_M is exactly 105,453,568 bytes (0.10 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
How large is SmolLM2-135M's KV cache?: 0.70 GiB at 32K context with an f16 cache, computed per layer. Quantizing the cache to q8_0 roughly halves it, which is often the difference between a context length fitting and not.
Which quantization of SmolLM2-135M should I use?: Q4_K_M is the usual default. Pick the largest quantization that fits your card at the context you actually need — the table above gives exact sizes for every one published.