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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 none Release: 2026-02-17 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 7.4 7.9
Rank #41 #30
Consistency 9.6 9.1
Tests Correct
Attempt pass rate 64.8% 70.6%
Flaky tests 1 2
Total Runs 54 49
Cost per result 2.376 0.000
Total Cost $0.262 $0.000
Input Price $3.000 / 1M $0.100 / 1M
Output Price $15.000 / 1M $0.300 / 1M
Output Tokens 7,433 71,904
Reasoning Tokens 0 155,607
Response Time (avg) 4.98s 26.78s
Response Time (max) 23.84s 170.45s
Response Time (total) 54.83s 294.58s

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Score vs Total Cost

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Score vs Response Time (avg)

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Score vs Total Output Tokens

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 4.8 10.0 25.0% 0 2.94s 1,214 0
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 3.67s 523 0
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 9.5 10.0 100.0% 0 23.84s 3,766 0
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 3.43s 252 0
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 7.7 10.0 66.7% 0 3.54s 413 0
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 6.1 3.1 66.7% 1 2.56s 192 0
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 6.5 10.0 50.0% 0 1.96s 90 0
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 7.7 10.0 66.7% 0 2.92s 536 0
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 4.11s 447 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802

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