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command-a-plus-05-2026-bf16

CohereLabs/command-a-plus-05-2026-bf16

command-a-plus-05-2026-bf16 at Q4_K_M is exactly 135,092,720,544 bytes (125.81 GiB / 135.09 GB) — an effective 4.941 bits per weight, not the nominal 4. Its KV cache at 32K is 1.42 GiB, not the 4.00 GiB a flat formula predicts.

From the file· summed from 4 file(s)From the file· KV per layer
Parameters
219B
total, not active
Architecture
cohere2moe
32 layers
Context
200,000
native (config.json)
License
apache-2.0

Shipped quantizations

exact bytes, summed from published files
QuantSizeExact bytesEffective bpwTensorsPublisher
IQ1_S45.87 GiB49,252,618,7521.801bartowski
IQ1_M2 shards50.59 GiB54,319,338,1441.986bartowski
IQ2_XXS2 shards57.98 GiB62,254,961,3442.277bartowski
IQ2_XS2 shards63.98 GiB68,697,412,2882.512bartowski
IQ2_S2 shards65.10 GiB69,905,371,8082.557bartowski
IQ2_M2 shards71.32 GiB76,582,703,7762.801bartowski
Q2_K3 shards74.56 GiB80,055,063,3282.928bartowski
Q2_K_L3 shards74.80 GiB80,315,110,1762.937bartowski
IQ3_XXS3 shards87.48 GiB93,929,820,9923.435bartowski
Q3_K_S3 shards91.28 GiB98,015,073,0563.584bartowski
IQ3_XS3 shards95.16 GiB102,175,822,6243.737bartowski
Q3_K_M3 shards95.53 GiB102,578,475,8083.751bartowski
Q3_K_L3 shards99.27 GiB106,588,230,4323.898bartowski
IQ3_M3 shards99.41 GiB106,739,225,3763.904bartowski
IQ4_XS4 shards110.67 GiB118,827,209,6324.346bartowski
IQ4_NL4 shards116.79 GiB125,403,878,3044.586bartowski
Q4_04 shards117.42 GiB126,074,966,9444.611bartowski
Q4_K_S4 shards120.92 GiB129,833,063,3924.748bartowski
Q4_K_M4 shards125.81 GiB135,092,720,5444.941bartowski
Q4_K_L4 shards126.06 GiB135,352,767,3924.950bartowski
Q4_14 shards129.29 GiB138,825,651,1045.077bartowski
Q5_K_S4 shards141.69 GiB152,138,372,0005.564bartowski
Q5_K_M5 shards146.93 GiB157,767,128,1285.770bartowski
Q6_K5 shards176.79 GiB189,828,387,8726.942bartowski
Q8_06 shards216.03 GiB231,955,977,3768.483bartowski

KV cache by context

computed per layer — this model uses sliding-window attention
ContextKV cache (f16)Flat formulaOverstated byFull / windowed / recurrent
4,0960.50 GiB0.50 GiB8 / 24 / 0
8,1920.67 GiB1.00 GiB1.49×8 / 24 / 0
16,3840.92 GiB2.00 GiB2.17×8 / 24 / 0
32,7681.42 GiB4.00 GiB2.81×8 / 24 / 0
65,5362.42 GiB8.00 GiB3.30×8 / 24 / 0
131,0724.42 GiB16.00 GiB3.62×8 / 24 / 0

24 of 32 layers cache only a 4,096-token window rather than the full context, on a period of 4. Figures assume the default configuration; --swa-full disables the saving entirely.

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 114.60 GiB. The real file is 125.81 GiB, because a quantization is a mixture and some tensors are always kept at higher precision. The larger discrepancy is the cache: a flat formula gives 4.00 GiB at 32K context where the real figure is 1.42 GiB, because most of this model's layers cache a fixed window rather than the whole context.

Architecture

from config.json
Layers
32
Attention heads
128
KV heads
8
Head dim
128
Hidden size
4096
Vocab
262,144
Sliding window
4096
SWA period
4
MLA
no
Experts
128
Experts per token
8
use_sliding_window

Questions people ask

How much VRAM does command-a-plus-05-2026-bf16 need?
Q4_K_M is exactly 135,092,720,544 bytes (125.81 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
How large is command-a-plus-05-2026-bf16's KV cache?
1.42 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 command-a-plus-05-2026-bf16 a mixture-of-experts model?
Yes — 128 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 command-a-plus-05-2026-bf16 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.