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Model comparison

Grok 4.20 vs Nemotron 3 Ultra

Data verified

Head-to-head evidence from 5 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

54.41/100
Margin
5.6pts
winning →
60/100
1 category wins2 category wins

Verified leaderboard positions: Grok 4.20 unranked; Nemotron 3 Ultra #24

BenchAlign evidence: Grok 4.20 estimated; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Grok 4.20 and Nemotron 3 Ultra share 5 comparable benchmark results. 3 of 8 categories are comparable. 14 results are unique to Grok 4.20; 34 to Nemotron 3 Ultra.

Updated July 16, 2026
Shared results
5
Grok 4.20 only
14
Nemotron 3 Ultra only
34
Comparable categories
3 / 8

Pick Grok 4.20 if you want the stronger benchmark profile. Nemotron 3 Ultra only becomes the better choice if reasoning is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 5 shared benchmark results across 4 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 4.20 is clearly ahead on the provisional aggregate, 68 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Grok 4.20's sharpest advantage is in coding, where it averages 67.1 against 58.3. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 47.1% to 56.4%. Nemotron 3 Ultra does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.

Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 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. Grok 4.20 gives you the larger context window at 2M, 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 Grok 4.20 and Nemotron 3 Ultra
CategoryGrok 4.20ΔNemotron 3 Ultra
CodingGrok 4.2067.1Margin← 8.8Nemotron 3 Ultra58.3
ReasoningGrok 4.2053.3Margin→ 8.6Nemotron 3 Ultra61.9
AgenticGrok 4.2047.1Margin→ 4.2Nemotron 3 Ultra51.3
KnowledgeGrok 4.20Not measuredMarginNo overlapNemotron 3 Ultra54.2
MultilingualGrok 4.20Not measuredMarginNo overlapNemotron 3 Ultra83.0
MultimodalGrok 4.2070.1MarginNo overlapNemotron 3 UltraNot measured
Inst. FollowingGrok 4.20Not measuredMarginNo overlapNemotron 3 Ultra81.7

Decisive benchmark drivers

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

More
A · Grok 4.20B · Nemotron 3 Ultra

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 47.1%B 56.4%
    Winner: Nemotron 3 UltraΔ 9.3
    Terminal-Bench 2.0: Grok 4.20 scored 47.1%; Nemotron 3 Ultra scored 56.4%. Nemotron 3 Ultra wins this benchmark.

  2. SWE-bench Verified

    Coding
    Source ↗
    A 76.7%B 71.9%
    Winner: Grok 4.20Δ 4.8
    SWE-bench Verified: Grok 4.20 scored 76.7%; Nemotron 3 Ultra scored 71.9%. Grok 4.20 wins this benchmark.

Operational comparison

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

MetricGrok 4.20Nemotron 3 UltraComparison
Input / output priceUSD per 1M tokensGrok 4.20$2 input / $6 outputNemotron 3 Ultra$0 input / $0 outputNemotron 3 Ultra has the lower combined listed price.
Generation speedtokens per secondGrok 4.20233 tok/sNemotron 3 UltraNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenGrok 4.2010.33 sNemotron 3 UltraNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensGrok 4.202MNemotron 3 Ultra1MGrok 4.20 lists the larger context window.

Benchmark Deep Dive

AgenticNemotron 3 Ultra wins
BenchmarkGrok 4.20Nemotron 3 UltraResult
Terminal-Bench 2.0Source 47.1%56.4%Nemotron 3 Ultra leads
DeepSearchQASource 62.8%—Not comparable
Gert LabsSource 38.36%—Not comparable
PinchBenchSource —90.0%Not comparable
BrowseCompSource —44.4%Not comparable
τ³-bench resultsSource —70.9%Not comparable
GDPval-AASource —33.2%Not comparable
HLE w/ toolsSource —37.4%Not comparable
AA Agentic IndexSource —27.4%Not comparable
τ²-bench resultsSource —83.3%Not comparable
GDPval-AASource —1164Not comparable
AA BriefcaseSource —870Not comparable
AA EnterpriseOps-GymSource —28.9%Not comparable
AA Harvey LABSource —3.3%Not comparable
CodingGrok 4.20 wins
BenchmarkGrok 4.20Nemotron 3 UltraResult
LiveCodeBench ProSource 74.2%—Not comparable
SWE-bench VerifiedSource 76.7%71.9%Grok 4.20 leads
SWE-bench ProSource 51.8%—Not comparable
Vibe Code BenchSource 4.06%—Not comparable
SWE MultilingualSource —67.7%Not comparable
LiveCodeBench v6Source —89.0%Not comparable
SciCodeSource —44.6%Not comparable
Terminal-Bench 2.0Source —56.4%Not comparable
AA Coding IndexSource —49.3%Not comparable
Terminal-Bench HardSource —36.4%Not comparable
AA-SciCodeSource —39.9%Not comparable
ReasoningNemotron 3 Ultra wins
BenchmarkGrok 4.20Nemotron 3 UltraResult
ARC-AGI-2Source 53.3%—Not comparable
AA-LCRSource —67.0%Not comparable
CritPtSource —3.1%Not comparable
LongBench v2Source —61.9%Not comparable
Knowledge
BenchmarkGrok 4.20Nemotron 3 UltraResult
GPQA-DSource 88.5%87.0%Grok 4.20 leads
HLE w/o toolsSource 31.6%26.7%Grok 4.20 leads
HealthBench HardSource 20.3%—Not comparable
MedXpertQA (Text)Source 50.2%—Not comparable
GPQASource —87%Not comparable
HLESource —26.7%Not comparable
MMLU-ProSource —86.8%Not comparable
AA-Omniscience AccuracySource —21.6%Not comparable
Artificial Analysis Intelligence IndexSource —37.8%Not comparable
AA-GPQA DiamondSource —86.7%Not comparable
AA-HLESource —26.6%Not comparable
AA-Omniscience IndexSource —-0.8%Not comparable
AA-Omniscience Hallucination RateSource —28.5%Not comparable
AA Openness IndexSource —83.3%Not comparable
Multilingual
BenchmarkGrok 4.20Nemotron 3 UltraResult
MMLU-ProXSource —83%Not comparable
Multimodal
BenchmarkGrok 4.20Nemotron 3 UltraResult
MMMU-ProSource 75.2%—Not comparable
CharXivSource 60.9%—Not comparable
ERQASource 54.1%—Not comparable
SimpleVQASource 57.4%—Not comparable
MedXpertQA (MM)Source 65.8%—Not comparable
GDPval-AASource 1055—Not comparable
Design Arena WebsiteSource 12621132Grok 4.20 leads
Inst. Following
BenchmarkGrok 4.20Nemotron 3 UltraResult
IFBenchSource —81.7%Not comparable
AA-IFBenchSource —81.4%Not comparable
Frequently Asked Questions (4)

Which is better, Grok 4.20 or Nemotron 3 Ultra?

Grok 4.20 is ahead on BenchLM's provisional leaderboard, 68 to 60. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 47.1% and 56.4%.

Which is better for coding, Grok 4.20 or Nemotron 3 Ultra?

Grok 4.20 has the edge for coding in this comparison, averaging 67.1 versus 58.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.

Which is better for reasoning, Grok 4.20 or Nemotron 3 Ultra?

Nemotron 3 Ultra has the edge for reasoning in this comparison, averaging 61.9 versus 53.3. Grok 4.20 stays close enough that the answer can still flip depending on your workload.

Which is better for agentic tasks, Grok 4.20 or Nemotron 3 Ultra?

Nemotron 3 Ultra has the edge for agentic tasks in this comparison, averaging 51.3 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

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