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Anthropic: Claude Sonnet 5 vs StepFun: Step 3.7 Flash

Summary

Claude Sonnet 5 vs Step 3.7 Flash benchmark comparison: Claude Sonnet 5 leads on average score with 7.9 vs 7.7. Step 3.7 Flash has the lower benchmark cost at $0.341 vs $0.550. Claude Sonnet 5 is faster at 9.94s vs 15.74s, with pass rates of 79.4% vs 68.3%.

Recommended model: Step 3.7 Flash - Its score stays close to the best score here (7.7 vs 7.9), while costing about 1.6x less than Claude Sonnet 5.

Last updated at: 2026-06-30

Metric Claude Sonnet 5 Claude Sonnet 5 medium Release: 2026-06-30 Step 3.7 Flash Step 3.7 Flash low Release: 2026-05-29
Score 7.9 7.7
Rank #30 #41
Reliability 10.0 10.0
Consistency 9.0 8.4
Tests Correct
Attempt pass rate 79.4% 68.3%
Flaky tests 3 4
Total Runs 63 63
Cost per result 3.662 2.840
Total Cost $0.550 $0.341
Input Price $2.000 / 1M $0.200 / 1M
Output Price $10.000 / 1M $1.150 / 1M
Total Input Tokens 67,416 40,101
Output Tokens 34,012 289,325
Reasoning Tokens 7,673 0
Response Time (avg) 9.94s 15.74s
Response Time (max) 56.94s 124.75s
Response Time (total) 208.71s 330.63s

Generation showcase

Hamster playing table tennis

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

#30 Claude Sonnet 5

medium
Cost
$0.007
Time
6.4s
Tokens
832 tok

#41 Step 3.7 Flash

low
Invalid SVG
Cost
$0.004
Time
25.3s
Tokens
3,072 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
Claude Sonnet 5 10.0 10.0 100.0% 0 3.80s 834 1,220 446
Step 3.7 Flash 8.7 7.9 91.7% 1 4.02s 756 10,896 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 9.0 7.9 88.9% 1 17.28s 10,590 13,153 2,379
Step 3.7 Flash 8.2 7.2 88.9% 1 9.46s 7,437 18,685 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 4.5 2.1 66.7% 1 37.01s 29,394 4,848 2,170
Step 3.7 Flash 10.0 10.0 100.0% 0 7.98s 13,683 6,426 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 10.0 10.0 100.0% 0 3.16s 10,503 312 0
Step 3.7 Flash 7.3 5.8 83.3% 1 2.29s 7,398 2,667 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 7.7 10.0 66.7% 0 20.38s 975 12,140 1,994
Step 3.7 Flash 5.3 7.2 44.4% 1 43.31s 828 104,487 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 4.8 3.2 33.3% 1 4.32s 708 264 0
Step 3.7 Flash 3.4 9.3 0.0% 0 7.00s 525 4,604 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 9.9 10.0 100.0% 0 3.10s 909 318 269
Step 3.7 Flash 9.8 10.0 100.0% 0 1.58s 735 1,857 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 7.7 10.0 66.7% 0 2.98s 894 407 121
Step 3.7 Flash 5.5 9.9 33.3% 0 1.84s 756 3,564 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 10.0 10.0 100.0% 0 10.70s 12,351 433 90
Step 3.7 Flash 10.0 10.0 100.0% 0 3.25s 7,746 1,360 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 5 3.0 10.0 0.0% 0 7.06s 258 917 204
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 237 134,779 0

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