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Model comparison

Grok 4.3 vs Nemotron 3 Ultra

Data verified

Head-to-head evidence from 21 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

65.07/100
Margin
5.1pts
← winning
60/100
0 category wins3 category wins

Public leaderboard positions: Grok 4.3 #28 (Supported); Nemotron 3 Ultra unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Grok 4.3 and Nemotron 3 Ultra share 21 comparable benchmark results. 3 of 8 categories are comparable. 5 results are unique to Grok 4.3; 18 to Nemotron 3 Ultra.

Updated July 17, 2026
Shared results
21
Grok 4.3 only
5
Nemotron 3 Ultra only
18
Comparable categories
3 / 8

Pick Grok 4.3 if you want the stronger benchmark profile. Nemotron 3 Ultra only becomes the better choice if knowledge is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 21 shared benchmark results across 6 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Grok 4.3 is clearly ahead on the BenchAlign aggregate, 65.07 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Grok 4.3 is also the more expensive model on tokens at $1.25 input / $2.50 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.

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 Grok 4.3 and Nemotron 3 Ultra
CategoryGrok 4.3ΔNemotron 3 Ultra
KnowledgeGrok 4.342.4Margin→ 11.8Nemotron 3 Ultra54.2
CodingGrok 4.347.3Margin→ 11.0Nemotron 3 Ultra58.3
Inst. FollowingGrok 4.381.3Margin→ 0.4Nemotron 3 Ultra81.7
AgenticGrok 4.3Not measuredMarginNo overlapNemotron 3 Ultra51.3
ReasoningGrok 4.3Not measuredMarginNo overlapNemotron 3 Ultra61.9
MultilingualGrok 4.3Not measuredMarginNo overlapNemotron 3 Ultra83.0
MultimodalGrok 4.378.1MarginNo overlapNemotron 3 UltraNot measured

Decisive benchmark drivers

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

More
A · Grok 4.3B · Nemotron 3 Ultra

  1. HLE

    Knowledge
    Source ↗
    A 35%B 26.7%
    Winner: Grok 4.3Δ 8.3
    HLE: Grok 4.3 scored 35%; Nemotron 3 Ultra scored 26.7%. Grok 4.3 wins this benchmark.

  2. GPQA

    Knowledge
    Source ↗
    A 90.1%B 87%
    Winner: Grok 4.3Δ 3.1
    GPQA: Grok 4.3 scored 90.1%; Nemotron 3 Ultra scored 87%. Grok 4.3 wins this benchmark.

  3. SciCode

    Coding
    Source ↗
    A 47.3%B 44.6%
    Winner: Grok 4.3Δ 2.7
    SciCode: Grok 4.3 scored 47.3%; Nemotron 3 Ultra scored 44.6%. Grok 4.3 wins this benchmark.

  4. IFBench

    Inst. Following
    Source ↗
    A 81.3%B 81.7%
    Winner: Nemotron 3 UltraΔ 0.4
    IFBench: Grok 4.3 scored 81.3%; Nemotron 3 Ultra scored 81.7%. Nemotron 3 Ultra wins this benchmark.

Operational comparison

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

MetricGrok 4.3Nemotron 3 UltraComparison
Input / output priceUSD per 1M tokensGrok 4.3$1.25 input / $2.5 outputNemotron 3 Ultra$0 input / $0 outputNemotron 3 Ultra has the lower combined listed price.
Generation speedtokens per secondGrok 4.3209 tok/sNemotron 3 UltraNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenGrok 4.312.36 sNemotron 3 UltraNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensGrok 4.31MNemotron 3 Ultra1MListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkGrok 4.3Nemotron 3 UltraResult
τ²-bench resultsSource 97.7%83.3%Grok 4.3 leads
GDPval-AASource 29.2%33.2%Nemotron 3 Ultra leads
AA Agentic IndexSource 24.1%27.4%Nemotron 3 Ultra leads
APEX-Agents-AASource 17.0%—Not comparable
GDPval-AASource 10851164Nemotron 3 Ultra leads
Gert LabsSource 43.86%—Not comparable
ResearchClawBenchSource 12.4%—Not comparable
Terminal-Bench 2.0Source —56.4%Not comparable
PinchBenchSource —90.0%Not comparable
BrowseCompSource —44.4%Not comparable
τ³-bench resultsSource —70.9%Not comparable
HLE w/ toolsSource —37.4%Not comparable
AA BriefcaseSource —870Not comparable
AA EnterpriseOps-GymSource —28.9%Not comparable
AA Harvey LABSource —3.3%Not comparable
CodingNemotron 3 Ultra wins
BenchmarkGrok 4.3Nemotron 3 UltraResult
SciCodeSource 47.3%44.6%Grok 4.3 leads
Terminal-Bench HardSource 37.9%36.4%Grok 4.3 leads
AA Coding IndexSource 42.3%49.3%Nemotron 3 Ultra leads
AA-SciCodeSource 47.3%39.9%Grok 4.3 leads
SWE-bench VerifiedSource —71.9%Not comparable
SWE MultilingualSource —67.7%Not comparable
LiveCodeBench v6Source —89.0%Not comparable
Terminal-Bench 2.0Source —56.4%Not comparable
Reasoning
BenchmarkGrok 4.3Nemotron 3 UltraResult
AA-LCRSource 64.3%67.0%Nemotron 3 Ultra leads
CritPtSource 8.0%3.1%Grok 4.3 leads
LongBench v2Source —61.9%Not comparable
KnowledgeNemotron 3 Ultra wins
BenchmarkGrok 4.3Nemotron 3 UltraResult
Artificial Analysis Intelligence IndexSource 37.6%37.8%Nemotron 3 Ultra leads
GPQASource 90.1%87%Grok 4.3 leads
HLESource 35%26.7%Grok 4.3 leads
AA-Omniscience AccuracySource 34.6%21.6%Grok 4.3 leads
AA-Omniscience Hallucination RateSource 25.0%28.5%Grok 4.3 leads
AA-GPQA DiamondSource 90.1%86.7%Grok 4.3 leads
AA-HLESource 35.0%26.6%Grok 4.3 leads
AA-Omniscience IndexSource 18.3%-0.8%Grok 4.3 leads
GPQA-DSource —87.0%Not comparable
HLE w/o toolsSource —26.7%Not comparable
MMLU-ProSource —86.8%Not comparable
AA Openness IndexSource —83.3%Not comparable
Multilingual
BenchmarkGrok 4.3Nemotron 3 UltraResult
MMLU-ProXSource —83%Not comparable
Multimodal
BenchmarkGrok 4.3Nemotron 3 UltraResult
MMMU-ProSource 78.1%—Not comparable
Design Arena WebsiteSource 12321132Grok 4.3 leads
AA-MMMU-ProSource 78.1%—Not comparable
Inst. FollowingNemotron 3 Ultra wins
BenchmarkGrok 4.3Nemotron 3 UltraResult
IFBenchSource 81.3%81.7%Nemotron 3 Ultra leads
AA-IFBenchSource 81.3%81.4%Nemotron 3 Ultra leads
Frequently Asked Questions (4)

Which is better, Grok 4.3 or Nemotron 3 Ultra?

Grok 4.3 is ahead on BenchLM's BenchAlign leaderboard, 65.07 to 60. The biggest single separator in this matchup is HLE, where the scores are 35% and 26.7%.

Which is better for knowledge tasks, Grok 4.3 or Nemotron 3 Ultra?

Nemotron 3 Ultra has the edge for knowledge tasks in this comparison, averaging 54.2 versus 42.4. Inside this category, AA-Omniscience Index is the benchmark that creates the most daylight between them.

Which is better for coding, Grok 4.3 or Nemotron 3 Ultra?

Nemotron 3 Ultra has the edge for coding in this comparison, averaging 58.3 versus 47.3. Inside this category, AA-SciCode is the benchmark that creates the most daylight between them.

Which is better for instruction following, Grok 4.3 or Nemotron 3 Ultra?

Nemotron 3 Ultra has the edge for instruction following in this comparison, averaging 81.7 versus 81.3. Inside this category, IFBench is the benchmark that creates the most daylight between them.

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Last updated: July 17, 2026

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