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Model comparison

Kimi K3 vs Nemotron 3 Ultra

Data verified

Head-to-head evidence from 23 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

Kimi K3
Moonshot AI
80.96/100
No comparison
N/A
2 category wins0 category wins

Public leaderboard positions: Kimi K3 #4 (Supported); Nemotron 3 Ultra unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Kimi K3 and Nemotron 3 Ultra share 23 comparable benchmark results. 2 of 8 categories are comparable. 34 results are unique to Kimi K3; 15 to Nemotron 3 Ultra.

Updated July 23, 2026
Shared results
23
Kimi K3 only
34
Nemotron 3 Ultra only
15
Comparable categories
2 / 8

Treat this as a split decision. Kimi K3 makes more sense if agentic is the priority or you need the larger 1.05M context window; Nemotron 3 Ultra is the better fit if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 23 shared benchmark results across 5 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Kimi K3 and Nemotron 3 Ultra finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

Kimi K3 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Nemotron 3 Ultra. That is roughly Infinityx on output cost alone. Kimi K3 gives you the larger context window at 1.05M, compared with 1M for Nemotron 3 Ultra.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Kimi K3 and Nemotron 3 Ultra
CategoryKimi K3ΔNemotron 3 Ultra
AgenticKimi K389.5Margin← 38.2Nemotron 3 Ultra51.3
KnowledgeKimi K361.0Margin← 7.2Nemotron 3 Ultra53.8
CodingKimi K3Not measuredMarginNo overlapNemotron 3 Ultra58.3
ReasoningKimi K3Not measuredMarginNo overlapNemotron 3 Ultra61.9
MultilingualKimi K3Not measuredMarginNo overlapNemotron 3 Ultra83.0
MultimodalKimi K378.5MarginNo overlapNemotron 3 UltraNot measured
Inst. FollowingKimi K3Not measuredMarginNo overlapNemotron 3 Ultra81.7

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Kimi K3B · Nemotron 3 Ultra

  1. BrowseComp

    Agentic
    Source ↗
    A 91.2%B 44.4%
    Winner: Kimi K3Δ 46.8
    BrowseComp: Kimi K3 scored 91.2%; Nemotron 3 Ultra scored 44.4%. Kimi K3 wins this benchmark.

  2. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 88.3%B 56.4%
    Winner: Kimi K3Δ 31.9
    Terminal-Bench 2.0: Kimi K3 scored 88.3%; Nemotron 3 Ultra scored 56.4%. Kimi K3 wins this benchmark.

  3. HLE

    Knowledge
    Source ↗
    A 56%B 26.7%
    Winner: Kimi K3Δ 29.3
    HLE: Kimi K3 scored 56%; Nemotron 3 Ultra scored 26.7%. Kimi K3 wins this benchmark.

  4. GPQA

    Knowledge
    Source ↗
    A 93.5%B 87%
    Winner: Kimi K3Δ 6.5
    GPQA: Kimi K3 scored 93.5%; Nemotron 3 Ultra scored 87%. Kimi K3 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricKimi K3Nemotron 3 UltraComparison
Input / output priceUSD per 1M tokensKimi K3$3 input / $15 outputNemotron 3 Ultra$0 input / $0 outputNemotron 3 Ultra has the lower combined listed price.
Generation speedtokens per secondKimi K3Not availableNemotron 3 UltraNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenKimi K3Not availableNemotron 3 UltraNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensKimi K31.05MNemotron 3 Ultra1MKimi K3 lists the larger context window.

Benchmark Deep Dive

AgenticKimi K3 wins
BenchmarkKimi K3Nemotron 3 UltraResult
Terminal-Bench 2.0Source 88.3%56.4%Kimi K3 leads
BrowseCompSource 91.2%44.4%Kimi K3 leads
DeepSearchQASource 95.0%—Not comparable
Toolathlon-VerifiedSource 73.2%—Not comparable
MCP AtlasSource 84.2%—Not comparable
AutomationBenchSource 30.8%—Not comparable
JobBenchSource 52.9%—Not comparable
APEX-AgentsSource 37.6%—Not comparable
SpreadsheetBench 2Source 34.8%—Not comparable
DECK-BenchSource 73.5%—Not comparable
AA Agentic IndexSource 50.1%27.4%Kimi K3 leads
GDPval-AASource 59.0%33.2%Kimi K3 leads
GDPval-AASource 16791164Kimi K3 leads
AA BriefcaseSource 1543870Kimi K3 leads
AA AutomationBenchSource 52.7%—Not comparable
AA EnterpriseOps-GymSource 45.3%28.9%Kimi K3 leads
AA Harvey LABSource 94.6%81.7%Kimi K3 leads
AA Tau3 BankingSource 33.4%—Not comparable
aaTerminalBench21Source 85%—Not comparable
APEX-Agents-AASource 41.3%—Not comparable
AA ITBenchSource 47.7%—Not comparable
PinchBenchSource —90.0%Not comparable
τ³-bench resultsSource —70.9%Not comparable
HLE w/ toolsSource —37.4%Not comparable
τ²-bench resultsSource —83.3%Not comparable
terminalBenchHardSource —36.4%Not comparable
Coding
BenchmarkKimi K3Nemotron 3 UltraResult
deepSweSource 67.5%—Not comparable
FrontierSWESource 81.2%—Not comparable
ProgramBenchSource 77.8%—Not comparable
Kimi Code Bench v2Source 72.9%—Not comparable
sweMarathonSource 42%—Not comparable
PostTrain BenchSource 36.6%—Not comparable
MLS-Bench LiteSource 48.3%—Not comparable
AA Coding IndexSource 76.2%49.3%Kimi K3 leads
AA-SciCodeSource 58.7%39.9%Kimi K3 leads
SWE-bench VerifiedSource —71.9%Not comparable
SWE MultilingualSource —67.7%Not comparable
SciCodeSource —44.6%Not comparable
Terminal-Bench 2.0Source —56.4%Not comparable
Reasoning
BenchmarkKimi K3Nemotron 3 UltraResult
AA-LCRSource 74.7%67.0%Kimi K3 leads
CritPtSource 23.4%3.1%Kimi K3 leads
LongBench v2Source —61.9%Not comparable
KnowledgeKimi K3 wins
BenchmarkKimi K3Nemotron 3 UltraResult
GPQASource 93.5%87%Kimi K3 leads
GPQA-DSource 93.5%87.0%Kimi K3 leads
HLESource 56%26.7%Kimi K3 leads
HLE w/o toolsSource 43.5%26.7%Kimi K3 leads
Artificial Analysis Intelligence IndexSource 57.1%37.8%Kimi K3 leads
AA-GPQA DiamondSource 93.5%86.7%Kimi K3 leads
AA-HLESource 44.3%26.6%Kimi K3 leads
AA-Omniscience IndexSource 18.4%-0.8%Kimi K3 leads
AA-Omniscience AccuracySource 46.0%21.6%Kimi K3 leads
AA-Omniscience Hallucination RateSource 50.9%28.5%Nemotron 3 Ultra leads
MMLU-ProSource —86.8%Not comparable
AA Openness IndexSource —83.3%Not comparable
Multilingual
BenchmarkKimi K3Nemotron 3 UltraResult
MMLU-ProXSource —83%Not comparable
Multimodal
BenchmarkKimi K3Nemotron 3 UltraResult
OfficeQA ProSource 63.3%—Not comparable
MMMU-ProSource 81.6%—Not comparable
MMMU-Pro w/ PythonSource 83.4%—Not comparable
CharXiv w/o toolsSource 84.8%—Not comparable
CharXivSource 91.3%—Not comparable
MathVisionSource 94.3%—Not comparable
MathVision w/ PythonSource 97.8%—Not comparable
BabyVision w/ PythonSource 85.7%—Not comparable
ZeroBenchSource 23.0%—Not comparable
ZeroBench w/ PythonSource 41.0%—Not comparable
WorldVQA ForceAnswerSource 51.0%—Not comparable
OmniDocBenchSource 91.1%—Not comparable
PerceptionBenchSource 58.5%—Not comparable
AA-MMMU-ProSource 80.5%—Not comparable
Design Arena WebsiteSource 13861129Kimi K3 leads
Inst. Following
BenchmarkKimi K3Nemotron 3 UltraResult
IFBenchSource —81.7%Not comparable
AA-IFBenchSource —81.4%Not comparable
Frequently Asked Questions (3)

Which is better, Kimi K3 or Nemotron 3 Ultra?

Kimi K3 and Nemotron 3 Ultra are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for knowledge tasks, Kimi K3 or Nemotron 3 Ultra?

Kimi K3 has the edge for knowledge tasks in this comparison, averaging 61 versus 53.8. Inside this category, HLE is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Kimi K3 or Nemotron 3 Ultra?

Kimi K3 has the edge for agentic tasks in this comparison, averaging 89.5 versus 51.3. Inside this category, AA Briefcase is the benchmark that creates the most daylight between them.

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