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Nemotron 3 Ultra 550b A55b vs Grok 4.1 Fast

Summary

Nemotron 3 Ultra 550b A55b vs Grok 4.1 Fast benchmark comparison: Nemotron 3 Ultra 550b A55b leads on average score with 8.1 vs 4.0. Grok 4.1 Fast has the lower benchmark cost at $0.008 vs $0.158. Grok 4.1 Fast is faster at 1.62s vs 15.05s, with pass rates of 69.8% vs 20.6%.

Recommended model: Nemotron 3 Ultra 550b A55b - It has the strongest score in this comparison (8.1) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-02

Metric Nemotron 3 Ultra 550b A55b Nemotron 3 Ultra 550b A55b medium Release: 2026-06-04 Free Available Grok 4.1 Fast Grok 4.1 Fast none Release: 2025-11-19
Score 8.1 4.0
Rank #26 #166
Reliability 9.7 10.0
Consistency 8.8 7.9
Tests Correct
Attempt pass rate 69.8% 20.6%
Flaky tests 3 3
Total Runs 63 57
Cost per result 0.000 0.273
Total Cost $0.158 $0.008
Input Price $0.500 / 1M $0.202 / 1M
Output Price $2.200 / 1M $0.202 / 1M
Total Input Tokens 46,813 36,608
Output Tokens 18,002 1,723
Reasoning Tokens 53,091 0
Response Time (avg) 15.05s 1.62s
Response Time (max) 43.93s 5.51s
Response Time (total) 316.09s 19.48s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#26 Nemotron 3 Ultra 550b A55b

medium
Invalid SVG
Cost
$0.000
Time
300.0s
Tokens
0 tok

#166 Grok 4.1 Fast

none
Grok 4.1 Fast is deprecated. xAI recommends switching to Grok 4.3 (https://openrouter.ai/x-ai/grok-4.3)
Cost
$0.000
Time
0.1s
Tokens
0 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 10.0 10.0 100.0% 0 8.62s 780 835 1,485
Grok 4.1 Fast 3.2 10.0 0.0% 0 1.07s 2,502 235 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 8.4 7.4 88.9% 1 26.53s 7,686 2,854 17,725
Grok 4.1 Fast 1.8 1.1 11.1% 1 1.79s 1,203 567 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 9.8 10.0 100.0% 0 43.93s 17,574 1,040 3,590
Grok 4.1 Fast 3.0 10.0 0.0% 0 3.33s 8,997 105 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 10.0 10.0 100.0% 0 5.68s 7,989 473 1,285
Grok 4.1 Fast 10.0 10.0 100.0% 0 943ms 8,073 180 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 3.5 4.4 33.3% 2 24.90s 858 11,169 16,249
Grok 4.1 Fast 5.9 7.2 55.6% 1 1.06s 2,133 15 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 3.7 9.5 0.0% 0 2.52s 360 70 235
Grok 4.1 Fast 4.4 9.9 0.0% 0 1.08s 948 112 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 9.8 10.0 100.0% 0 6.35s 765 182 1,243
Grok 4.1 Fast 3.0 10.0 0.0% 0 685ms 1,608 60 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 5.5 9.9 33.3% 0 3.54s 792 771 2,055
Grok 4.1 Fast 3.0 10.0 0.0% 0 1.10s 2,058 229 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 10.0 10.0 100.0% 0 7.72s 9,781 304 984
Grok 4.1 Fast 2.8 1.6 33.3% 1 5.51s 8,432 208 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Nemotron 3 Ultra 550b A55b 3.0 10.0 0.0% 0 38.47s 228 304 8,240
Grok 4.1 Fast 3.0 10.0 0.0% 0 731ms 654 12 0

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