Qwen · vision language · mixture of experts

Qwen3.6-35B-A3B

Qwen/Qwen3.6-35B-A3B

Qwen3.6-35B-A3B at Q4_K_M is exactly 21,166,757,728 bytes (19.71 GiB / 21.17 GB) — an effective 4.710 bits per weight, not the nominal 4. Its KV cache at 32K is 0.63 GiB.

From the file· summed from 1 file(s)From the file· KV per layer
Parameters
36.0B
total, not active
Architecture
qwen35moe
40 layers
Context
262,144
native (config.json)
License
apache-2.0

Shipped quantizations

exact bytes, summed from published files
QuantSizeExact bytesEffective bpwTensorsPublisher
UD-IQ1_M9.36 GiB10,047,749,0882.236unsloth
UD-IQ2_XXS10.02 GiB10,756,586,4642.394unsloth
UD-IQ1_M10.59 GiB11,366,414,6242.529unsloth
UD-IQ2_M10.73 GiB11,522,702,3042.564unsloth
UD-IQ2_XXS11.01 GiB11,819,399,4562.630unsloth
UD-IQ2_M11.07 GiB11,882,969,3762.644unsloth
UD-IQ3_XXS12.30 GiB13,211,155,4242.940unsloth
UD-IQ3_S12.74 GiB13,676,723,1683.043unsloth
UD-IQ3_XXS13.10 GiB14,069,266,7203.131unsloth
UD-IQ3_S14.29 GiB15,346,432,2883.415unsloth
UD-Q3_K_S14.30 GiB15,359,196,1283.418unsloth
UD-Q3_K_M15.46 GiB16,600,710,1123.694unsloth
UD-Q3_K_M15.93 GiB17,104,402,7203.806unsloth
UD-IQ4_XS16.51 GiB17,730,509,7923.945unsloth
UD-IQ4_NL16.80 GiB18,040,888,2884.014unsloth
UD-IQ4_XS16.96 GiB18,209,036,5764.052unsloth
UD-IQ4_NL17.26 GiB18,536,192,2884.125unsloth
UD-Q4_K_S19.46 GiB20,893,015,0084.649unsloth
Q4_K_M19.71 GiB21,166,757,7284.710733lmstudio-community
UD-Q4_K_S19.92 GiB21,388,319,0084.759unsloth
UD-Q4_K_M20.61 GiB22,134,528,9924.925unsloth
UD-Q4_K_M21.11 GiB22,663,387,4245.043unsloth
UD-Q5_K_S23.23 GiB24,942,050,2725.550unsloth
UD-Q5_K_S23.78 GiB25,538,017,5685.683unsloth
UD-Q5_K_M24.64 GiB26,456,194,0165.887unsloth
UD-Q5_K_M25.23 GiB27,087,812,8966.028unsloth
Q6_K26.56 GiB28,514,152,2886.345733lmstudio-community
UD-Q6_K27.30 GiB29,308,320,7366.522unsloth
UD-Q6_K27.95 GiB30,011,242,7846.678unsloth
Q8_034.37 GiB36,903,139,1688.212lmstudio-community
Q8_034.37 GiB36,903,140,3208.212733unsloth
Q8_035.21 GiB37,801,097,5048.412753unsloth
BF162 shards64.61 GiB69,376,638,17615.438unsloth
BF162 shards66.19 GiB71,065,942,56015.814unsloth

KV cache by context

computed per layer
ContextKV cache (f16)Flat formulaOverstated byFull / windowed / recurrent
4,0960.08 GiB0.31 GiB4.00×10 / 0 / 30
8,1920.16 GiB0.63 GiB4.00×10 / 0 / 30
16,3840.31 GiB1.25 GiB4.00×10 / 0 / 30
32,7680.63 GiB2.50 GiB4.00×10 / 0 / 30
65,5361.25 GiB5.00 GiB4.00×10 / 0 / 30
131,0722.50 GiB10.00 GiB4.00×10 / 0 / 30

30 of 40 layers use linear attention, which keeps a fixed-size recurrent state instead of a per-token cache. Those layers do not grow with context at all — treating them as ordinary attention, as a flat formula does, overstates this model's cache by roughly 4.0× at long context.

Compare with

same modality, comparable size

Will it run on your card?

full quant x context sweep

Why other calculators give a different number

A parameters × bits ÷ 8 estimate puts Q4_K_M at roughly 18.83 GiB. The real file is 19.71 GiB, because a quantization is a mixture and some tensors are always kept at higher precision.

Architecture

from config.json
Layers
40
Attention heads
16
KV heads
2
Head dim
256
Hidden size
2048
Vocab
248,320
Sliding window
none
SWA period
MLA
no
Experts
256
Experts per token
8
use_sliding_window

Questions people ask

How much VRAM does Qwen3.6-35B-A3B need?
Q4_K_M is exactly 21,166,757,728 bytes (19.71 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
How large is Qwen3.6-35B-A3B's KV cache?
0.63 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.
Is Qwen3.6-35B-A3B a mixture-of-experts model?
Yes — 256 experts, 8 routed per token. Every expert must be resident, but only the routed ones are read per token, which is why its memory requirement and its speed behave very differently.
Which quantization of Qwen3.6-35B-A3B 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.