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Anthropic: Claude Sonnet 4.6 vs StepFun: Step 3.5 Flash

Last updated at: 2026-04-16

Metric Claude Sonnet 4.6 Claude Sonnet 4.6 medium Release: 2026-02-17 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 8.0 7.9
Rank #26 #30
Consistency 9.5 9.1
Tests Correct
Attempt pass rate 74.1% 70.6%
Flaky tests 1 2
Total Runs 54 49
Cost per result 8.930 0.000
Total Cost $1.161 $0.000
Input Price $3.000 / 1M $0.100 / 1M
Output Price $15.000 / 1M $0.300 / 1M
Output Tokens 42,068 71,904
Reasoning Tokens 26,784 155,607
Response Time (avg) 12.66s 26.78s
Response Time (max) 46.35s 170.45s
Response Time (total) 126.62s 294.58s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.5 10.0 50.0% 0 2.98s 1,046 1,093
Step 3.5 Flash 10.0 10.0 100.0% 0 13.56s 14,376 17,668
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 35.76s 6,894 2,097
Step 3.5 Flash - - - - - - - -
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 46.35s 5,871 3,962
Step 3.5 Flash 10.0 10.0 100.0% 0 29.57s 1,176 12,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 13.90s 649 742
Step 3.5 Flash 10.0 10.0 100.0% 0 15.01s 600 13,886
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 2.9 7.2 11.1% 1 0ms 25,790 16,919
Step 3.5 Flash 5.3 7.2 44.4% 1 170.45s 45,350 90,436
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 4.94s 256 433
Step 3.5 Flash 5.5 10.0 0.0% 0 6.54s 2,214 2,584
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 2.61s 318 552
Step 3.5 Flash 8.5 6.8 83.3% 1 4.98s 2,284 3,412
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 4.80s 589 635
Step 3.5 Flash 5.3 10.0 33.3% 0 7.72s 5,629 10,835
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 7.48s 655 351
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802

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