command-a-plus-05-2026-bf16
CohereLabs/command-a-plus-05-2026-bf16command-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.
Shipped quantizations
| Quant | Size● | Exact bytes● | Effective bpw● | Tensors● | Publisher |
|---|---|---|---|---|---|
| IQ1_S | 45.87 GiB | 49,252,618,752 | 1.801 | — | bartowski |
| IQ1_M2 shards | 50.59 GiB | 54,319,338,144 | 1.986 | — | bartowski |
| IQ2_XXS2 shards | 57.98 GiB | 62,254,961,344 | 2.277 | — | bartowski |
| IQ2_XS2 shards | 63.98 GiB | 68,697,412,288 | 2.512 | — | bartowski |
| IQ2_S2 shards | 65.10 GiB | 69,905,371,808 | 2.557 | — | bartowski |
| IQ2_M2 shards | 71.32 GiB | 76,582,703,776 | 2.801 | — | bartowski |
| Q2_K3 shards | 74.56 GiB | 80,055,063,328 | 2.928 | — | bartowski |
| Q2_K_L3 shards | 74.80 GiB | 80,315,110,176 | 2.937 | — | bartowski |
| IQ3_XXS3 shards | 87.48 GiB | 93,929,820,992 | 3.435 | — | bartowski |
| Q3_K_S3 shards | 91.28 GiB | 98,015,073,056 | 3.584 | — | bartowski |
| IQ3_XS3 shards | 95.16 GiB | 102,175,822,624 | 3.737 | — | bartowski |
| Q3_K_M3 shards | 95.53 GiB | 102,578,475,808 | 3.751 | — | bartowski |
| Q3_K_L3 shards | 99.27 GiB | 106,588,230,432 | 3.898 | — | bartowski |
| IQ3_M3 shards | 99.41 GiB | 106,739,225,376 | 3.904 | — | bartowski |
| IQ4_XS4 shards | 110.67 GiB | 118,827,209,632 | 4.346 | — | bartowski |
| IQ4_NL4 shards | 116.79 GiB | 125,403,878,304 | 4.586 | — | bartowski |
| Q4_04 shards | 117.42 GiB | 126,074,966,944 | 4.611 | — | bartowski |
| Q4_K_S4 shards | 120.92 GiB | 129,833,063,392 | 4.748 | — | bartowski |
| Q4_K_M4 shards | 125.81 GiB | 135,092,720,544 | 4.941 | — | bartowski |
| Q4_K_L4 shards | 126.06 GiB | 135,352,767,392 | 4.950 | — | bartowski |
| Q4_14 shards | 129.29 GiB | 138,825,651,104 | 5.077 | — | bartowski |
| Q5_K_S4 shards | 141.69 GiB | 152,138,372,000 | 5.564 | — | bartowski |
| Q5_K_M5 shards | 146.93 GiB | 157,767,128,128 | 5.770 | — | bartowski |
| Q6_K5 shards | 176.79 GiB | 189,828,387,872 | 6.942 | — | bartowski |
| Q8_06 shards | 216.03 GiB | 231,955,977,376 | 8.483 | — | bartowski |
KV cache by context
| Context | KV cache (f16)● | Flat formula | Overstated by | Full / windowed / recurrent |
|---|---|---|---|---|
| 4,096 | 0.50 GiB | 0.50 GiB | — | 8 / 24 / 0 |
| 8,192 | 0.67 GiB | 1.00 GiB | 1.49× | 8 / 24 / 0 |
| 16,384 | 0.92 GiB | 2.00 GiB | 2.17× | 8 / 24 / 0 |
| 32,768 | 1.42 GiB | 4.00 GiB | 2.81× | 8 / 24 / 0 |
| 65,536 | 2.42 GiB | 8.00 GiB | 3.30× | 8 / 24 / 0 |
| 131,072 | 4.42 GiB | 16.00 GiB | 3.62× | 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
Will it run on your card?
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
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.