Is Nanbeige4.1-3B or Qwen3-4B smaller?

Nanbeige4.1-3B is smaller at Q4_K_M: 2.28 GiB against 2.33 GiB.

Which uses less memory at long context?

Nanbeige4.1-3B — its KV cache at 32K context is 2.3x smaller, because of how its attention layers cache.

Model comparison

Nanbeige4.1-3B vs Qwen3-4B

At Q4_K_M, Nanbeige4.1-3B is the smaller download — 2,443,112,576 bytes against 2,497,280,256. At long context the gap widens: Nanbeige4.1-3B's KV cache at 32K is 2.3× smaller, which usually matters more than the difference in weights.

From the file· summed bytes, KV per layer

Side by side

	Nanbeige4.1-3B	Qwen3-4B
Parameters	3.9B	4.0B
Architecture	llama	qwen3
Layers	32	36
Native context	262,144	40,960
Mixture of experts	no	no
Quantizations published	14	29
Smallest quantization	1.51 GiB	1.01 GiB
Q4_K_M	2.28 GiB	2.33 GiB
Licence	apache-2.0	—

KV cache by context

the term that decides long-context viability

Context	Nanbeige4.1-3B	Qwen3-4B	Ratio
4,096	0.25 GiB	0.56 GiB	2.25×
8,192	0.50 GiB	1.13 GiB	2.25×
16,384	1.00 GiB	2.25 GiB	2.25×
32,768	2.00 GiB	4.50 GiB	2.25×
65,536	4.00 GiB	9.00 GiB	2.25×
131,072	8.00 GiB	18.00 GiB	2.25×