Is Qwen3.5-99B or Qwen3.6-27B smaller?

Qwen3.6-27B is smaller at Q4_K_M: 15.41 GiB against 56.06 GiB.

Which uses less memory at long context?

Qwen3.5-99B — its KV cache at 32K context is 2.7x smaller, because of how its attention layers cache.

Model comparison

Qwen3.5-99B vs Qwen3.6-27B

At Q4_K_M, Qwen3.6-27B is the smaller download — 16,547,397,888 bytes against 60,194,980,672. At long context the gap widens: Qwen3.5-99B's KV cache at 32K is 2.7× smaller, which usually matters more than the difference in weights.

From the file· summed bytes, KV per layer

Side by side

	Qwen3.5-99B	Qwen3.6-27B
Parameters	99.0B	27.8B
Architecture	qwen35moe	qwen35
Layers	48	64
Native context	262,144	262,144
Mixture of experts	yes, 205 experts	no
Quantizations published	36	40
Smallest quantization	19.31 GiB	8.74 GiB
Q4_K_M	56.06 GiB	15.41 GiB
Licence	other	apache-2.0

KV cache by context

the term that decides long-context viability

Context	Qwen3.5-99B	Qwen3.6-27B	Ratio
4,096	0.09 GiB	0.25 GiB	2.67×
8,192	0.19 GiB	0.50 GiB	2.67×
16,384	0.38 GiB	1.00 GiB	2.67×
32,768	0.75 GiB	2.00 GiB	2.67×
65,536	1.50 GiB	4.00 GiB	2.67×
131,072	3.00 GiB	8.00 GiB	2.67×