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StepFun: Step 3.7 Flash vs xAI: Grok 4.20

Summary

Step 3.7 Flash vs Grok 4.20 benchmark comparison: Step 3.7 Flash leads on average score with 7.3 vs 7.1. Step 3.7 Flash has the lower benchmark cost at $0.341 vs $0.609. Step 3.7 Flash is faster at 15.74s vs 27.68s, with pass rates of 68.3% vs 63.5%.

Recommended model: Step 3.7 Flash - It has the best score here (7.3), while costing about 1.8x less than Grok 4.20.

Last updated at: 2026-06-04

Metric Step 3.7 Flash Step 3.7 Flash low Release: 2026-05-29 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.3 7.1
Rank #57 #65
Reliability 10.0 10.0
Consistency 8.4 8.8
Tests Correct
Attempt pass rate 68.3% 63.5%
Flaky tests 4 3
Total Runs 63 63
Cost per result 2.840 8.309
Total Cost $0.341 $0.609
Input Price $0.200 / 1M $1.250 / 1M
Output Price $1.150 / 1M $2.500 / 1M
Total Input Tokens 40,101 44,433
Output Tokens 289,325 1,819
Reasoning Tokens 0 219,524
Response Time (avg) 15.74s 27.68s
Response Time (max) 124.75s 199.66s
Response Time (total) 330.63s 581.26s

Generation showcase

Hamster playing table tennis

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

#57 Step 3.7 Flash

low
Invalid SVG
Cost
$0.004
Time
25.3s
Tokens
3,072 tok

#65 xAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 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
Step 3.7 Flash 8.7 7.9 91.7% 1 4.02s 756 10,896 0
Grok 4.20 8.2 7.9 83.3% 1 3.95s 2,010 287 8,312
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 8.2 7.2 88.9% 1 9.46s 7,437 18,685 0
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 10.0 10.0 100.0% 0 7.98s 13,683 6,426 0
Grok 4.20 10.0 10.0 100.0% 0 17.40s 12,909 232 9,556
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 7.3 5.8 83.3% 1 2.29s 7,398 2,667 0
Grok 4.20 10.0 10.0 100.0% 0 4.17s 7,761 180 5,333
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 5.3 7.2 44.4% 1 43.31s 828 104,487 0
Grok 4.20 5.3 10.0 33.3% 0 27.03s 1,764 375 49,339
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 3.4 9.3 0.0% 0 7.00s 525 4,604 0
Grok 4.20 3.9 2.6 33.3% 1 24.48s 825 65 6,440
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 9.8 10.0 100.0% 0 1.58s 735 1,857 0
Grok 4.20 9.8 10.0 100.0% 0 4.26s 1,362 57 6,419
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 5.5 9.9 33.3% 0 1.84s 756 3,564 0
Grok 4.20 7.7 10.0 66.7% 0 6.22s 1,689 149 7,913
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 10.0 10.0 100.0% 0 3.25s 7,746 1,360 0
Grok 4.20 3.0 10.0 0.0% 0 13.68s 7,275 197 6,620
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 237 134,779 0
Grok 4.20 3.0 10.0 0.0% 0 63.48s 531 9 16,442

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