Kimi K2 Thinking vs NVIDIA Nemotron 3 Ultra 550B A55B BF16
Kimi K2 Thinking and NVIDIA Nemotron 3 Ultra 550B A55B BF16 match in llmrun Score, with values of 108.6 versus 109.9; neither fits 24 GB.
Model A · Moonshot AI
Kimi K2 Thinking1026.4B · 32.9B active · 256K context · Other · Nov 2025
Model B · NVIDIA
NVIDIA Nemotron 3 Ultra 550B A55B BF16560.5B · 57B active · 256K context · Other · Jun 2026
Choose NVIDIA Nemotron 3 Ultra 550B A55B BF16 if you want…
Ahead on the benchmarks
3 of 3 shared boards
Lighter on memory
370.0 vs 619.7 GB at Q4_K_M
Newer release
Jun 2026 vs Nov 2025
Kimi K2 Thinking: no clear edge over NVIDIA Nemotron 3 Ultra 550B A55B BF16 in the data we have.
On your hardware
Each model at its default quant (Q4_K_M), a smaller one when it must. Estimates, ±20%.
8 GB
RTX 4060 · 8 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
12 GB
RTX 3060 12GB · 12 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
16 GB
RTX 5060 Ti 16GB · 16 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
24 GBreference
RTX 4090 · 24 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
32 GB
RTX 5090 · 32 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
48 GB
RTX A6000 · 48 GB tier
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
Mac 32 GB
Mac Mini M4 · Macs
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
Mac 64 GB
Mac Studio M4 Max · Macs
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
Mac 128 GB
Mac Studio M4 Max · Macs
Kimi K2 Thinking
Doesn't fit
smallest quant needs 283.7 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Doesn't fit
smallest quant needs 178 GB
Reference GPU: RTX 4090. Tinted cell = the better pick on that machine (fits, more headroom, or at least 10% faster).
Overall
Kimi K2 Thinking
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Coding
Kimi K2 Thinking
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Agents
Kimi K2 Thinking
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Math
Kimi K2 Thinking
no data
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Science
Kimi K2 Thinking
no data
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Reasoning
Kimi K2 Thinking
no data
NVIDIA Nemotron 3 Ultra 550B A55B BF16
Kimi K2 Thinking · #31 of 100 open models · #28 of 96 that fit ≤640 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16 · #26 of 100 open models · #23 of 96 that fit ≤512 GB
Benchmarks
3 shared boards: Kimi K2 Thinking leads 0, NVIDIA Nemotron 3 Ultra 550B A55B BF16 leads 3 · Benchmarks imported Oct 2026
Kimi K2 Thinking
84.2%#22/98 open
IndependentEpoch AI · Nov 2025
NVIDIA Nemotron 3 Ultra 550B A55B BF16
85.4%#20/98 open
IndependentEpoch AI · Jun 2026
Kimi K2 Thinking
83.1%#23/86 open
IndependentEpoch AI · Nov 2025
NVIDIA Nemotron 3 Ultra 550B A55B BF16
86.7%#18/86 open
IndependentEpoch AI · Jun 2026
Kimi K2 Thinking
42.8%#17/46 open
IndependentEpoch AI · Nov 2025
NVIDIA Nemotron 3 Ultra 550B A55B BF16
43.5%#16/46 open
IndependentEpoch AI · Jun 2026
26 more boards (other shared and single-model boards)
Kimi K2 Thinking
1430.1#25/187 open
ArenaLMArena · Oct 2026
NVIDIA Nemotron 3 Ultra 550B A55B BF16
1426.0#27/187 open
ArenaLMArena · Oct 2026
Only Kimi K2 Thinking (7)
- SWE-bench Verified63.4%
- Terminal-Bench35.7%
- LMArena WebDev1322.1
- SWE-bench Bash Only63.4%
- CL-bench17.6%
- ALE-Bench597.5
- METR Time Horizons59.2%
Only NVIDIA Nemotron 3 Ultra 550B A55B BF16 (18)
- LiveBench Coding70.7
- LiveBench Reasoning74.7
- LiveBench Math88.7
- SciCode40.3%
- FrontierCode13.6%
- APEX-Agents22.7%
- CritPt3.1%
- DTBench90.1%
- LiveBench 2026 Reasoning74.7
- LMCA36.9%
- Mystery Game Puzzles20.0%
- LiveBench 2026 Browser0.0
- LiveBench 2026 Data Analysis54.5
- LiveBench 2026 Coding43.6
- LiveBench 2026 Long-Horizon11.2
- LiveBench 2026 Design58.6
- ProofBench2.0%
- LiveBench 2026 Research43.2
VRAM by quantization
Memory to load the model and 2K context; below it, the total at 32K and 128K context. Lighter side in bold.
Q2_K
Kimi K2 Thinking
440 GB374.1 GB file
32K 439 GB · 128K 446 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
262 GB~238.2 GB file
32K 280 GB · 128K 338 GB
Q3_K_S
Kimi K2 Thinking
453 GB443.2 GB file
32K 452 GB · 128K 459 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
Q3_K_M
Kimi K2 Thinking
504 GB490.0 GB file
32K 503 GB · 128K 510 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
301 GB274.0 GB file
32K 319 GB · 128K 376 GB
Q4_0
Kimi K2 Thinking
517 GB581.2 GB file
32K 516 GB · 128K 523 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
Q4_K_M
Kimi K2 Thinking
620 GB621.2 GB file
32K 618 GB · 128K 625 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
370 GB359.2 GB file
32K 388 GB · 128K 446 GB
Q5_K_M
Kimi K2 Thinking
735 GB728.7 GB file
32K 734 GB · 128K 741 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
439 GB426.5 GB file
32K 457 GB · 128K 515 GB
Q6_K
Kimi K2 Thinking
851 GB842.9 GB file
32K 849 GB · 128K 856 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
509 GB460.7 GB file
32K 527 GB · 128K 585 GB
Q8_0
Kimi K2 Thinking
1030 GB1091.1 GB file
32K 1029 GB · 128K 1036 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
617 GB584.3 GB file
32K 635 GB · 128K 692 GB
15 more quants
IQ2_XXS
Kimi K2 Thinking
286 GB335.2 GB file
32K 285 GB · 128K 292 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
170 GB193.8 GB file
32K 188 GB · 128K 245 GB
IQ2_XS
Kimi K2 Thinking
312 GB283.4 GB file
32K 311 GB · 128K 317 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
185 GB169.5 GB file
32K 203 GB · 128K 261 GB
IQ2_S
Kimi K2 Thinking
325 GB284.1 GB file
32K 323 GB · 128K 330 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
IQ2_M
Kimi K2 Thinking
350 GB353.6 GB file
32K 349 GB · 128K 356 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
208 GB194.0 GB file
32K 226 GB · 128K 284 GB
IQ3_XXS
Kimi K2 Thinking
402 GB421.7 GB file
32K 400 GB · 128K 407 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
239 GB223.3 GB file
32K 257 GB · 128K 315 GB
IQ3_XS
Kimi K2 Thinking
427 GB420.7 GB file
32K 426 GB · 128K 433 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
IQ3_S
Kimi K2 Thinking
not listed
NVIDIA Nemotron 3 Ultra 550B A55B BF16
262 GB250.5 GB file
32K 280 GB · 128K 338 GB
IQ3_M
Kimi K2 Thinking
466 GB467.5 GB file
32K 464 GB · 128K 471 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
Q3_K_L
Kimi K2 Thinking
530 GB487.7 GB file
32K 529 GB · 128K 536 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
IQ4_XS
Kimi K2 Thinking
556 GB547.2 GB file
32K 554 GB · 128K 561 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
331 GB286.1 GB file
32K 349 GB · 128K 407 GB
IQ4_NL
Kimi K2 Thinking
581 GB579.1 GB file
32K 580 GB · 128K 587 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
347 GB294.2 GB file
32K 365 GB · 128K 423 GB
Q4_1
Kimi K2 Thinking
581 GB642.9 GB file
32K 580 GB · 128K 587 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
not listed
Q4_K_S
Kimi K2 Thinking
581 GB583.3 GB file
32K 580 GB · 128K 587 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
347 GB327.7 GB file
32K 365 GB · 128K 423 GB
Q5_K_S
Kimi K2 Thinking
710 GB707.0 GB file
32K 708 GB · 128K 715 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
424 GB391.7 GB file
32K 442 GB · 128K 500 GB
BF16
Kimi K2 Thinking
2057 GB2053.2 GB file
32K 2055 GB · 128K 2062 GB
NVIDIA Nemotron 3 Ultra 550B A55B BF16
1233 GB1099.0 GB file
32K 1251 GB · 128K 1309 GB
Kimi K2 Thinking
Ollama · Q4_K_M
ollama run hf.co/unsloth/Kimi-K2-Thinking-GGUF:Q4_K_MNVIDIA Nemotron 3 Ultra 550B A55B BF16
Ollama · Q4_K_M
ollama run hf.co/unsloth/NVIDIA-Nemotron-3-Ultra-550B-A55B-GGUF:Q4_K_M| Spec | Kimi K2 Thinking | NVIDIA Nemotron 3 Ultra 550B A55B BF16 |
|---|---|---|
| Publisher | Moonshot AI | NVIDIA |
| Parameters | 1026.4B | 560.5B |
| Active parameters | 33B per token | 57B per token |
| Architecture | DeepseekV3ForCausalLM | NemotronHForCausalLM |
| Context | 256K tokens | 256K tokens |
| Modalities | Chat, Function-calling | Chat, Function-calling |
| License | Other | Other |
| Released | Nov 2025 | Jun 2026 |
Frequently Asked Questions
Which is better, Kimi K2 Thinking or NVIDIA Nemotron 3 Ultra 550B A55B BF16?
Kimi K2 Thinking and NVIDIA Nemotron 3 Ultra 550B A55B BF16 match in llmrun Score, with values of 108.6 versus 109.9; neither fits 24 GB. Choose NVIDIA Nemotron 3 Ultra 550B A55B BF16 for ahead on the benchmarks and lighter on memory.
Which needs less VRAM, Kimi K2 Thinking or NVIDIA Nemotron 3 Ultra 550B A55B BF16?
At Q4_K_M, Kimi K2 Thinking requires 619.7 GB while NVIDIA Nemotron 3 Ultra 550B A55B BF16 needs 370.0 GB, making NVIDIA Nemotron 3 Ultra 550B A55B BF16 the easier model to run on your local setup.
Can I run Kimi K2 Thinking or NVIDIA Nemotron 3 Ultra 550B A55B BF16 on a 16 GB GPU?
Kimi K2 Thinking does not fit (smallest quant needs 283.7 GB); NVIDIA Nemotron 3 Ultra 550B A55B BF16 does not fit (smallest quant needs 178 GB).
Which has a longer context window, Kimi K2 Thinking or NVIDIA Nemotron 3 Ultra 550B A55B BF16?
Kimi K2 Thinking supports 262,144 tokens and NVIDIA Nemotron 3 Ultra 550B A55B BF16 supports 262,144 tokens.