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Anthropic: Claude Sonnet 4.6 vs StepFun: Step 3.5 Flash

Last updated at: 2026-06-03

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 7.0 7.4
Rank #72 #55
Reliability 10.0 10.0
Consistency 9.7 9.4
Tests Correct
Attempt pass rate 58.3% 59.7%
Flaky tests 1 1
Total Runs 60 57
Cost per result 2.782 0.133
Total Cost $0.306 $0.062
Input Price $3.000 / 1M $0.090 / 1M
Output Price $15.000 / 1M $0.300 / 1M
Total Input Tokens 54,721 33,555
Output Tokens 9,450 90,478
Reasoning Tokens 0 173,544
Response Time (avg) 5.27s 43.20s
Response Time (max) 23.84s 170.45s
Response Time (total) 68.50s 561.54s

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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 4.6 4.8 10.0 25.0% 0 2.94s 636 1,214 0
Step 3.5 Flash 10.0 10.0 100.0% 0 40.57s 694 20,391 24,176
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.8 10.0 50.0% 0 6.73s 5,357 2,112 0
Step 3.5 Flash 3.5 7.8 0.0% 0 62.83s 1,335 12,098 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 9.5 10.0 100.0% 0 23.84s 26,024 3,766 0
Step 3.5 Flash 10.0 10.0 100.0% 0 29.57s 13,638 1,176 12,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 3.43s 8,574 252 0
Step 3.5 Flash 10.0 10.0 100.0% 0 15.01s 7,368 600 13,886
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 7.7 10.0 66.7% 0 3.54s 759 413 0
Step 3.5 Flash 5.3 7.2 44.4% 1 170.45s 673 45,350 90,436
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.1 3.1 66.7% 1 2.56s 513 192 0
Step 3.5 Flash 5.5 10.0 0.0% 0 22.39s 509 240 3,506
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.5 10.0 50.0% 0 1.96s 690 90 0
Step 3.5 Flash 8.3 10.0 50.0% 0 4.78s 705 2,364 3,521
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 7.7 10.0 66.7% 0 2.53s 663 533 0
Step 3.5 Flash 5.3 10.0 33.3% 0 7.22s 711 5,630 10,861
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 4.11s 11,301 447 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 7,701 275 3,802
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Sonnet 4.6 3.0 10.0 0.0% 0 4.67s 204 431 0
Step 3.5 Flash 3.0 10.0 0.0% 0 108.45s 221 2,354 10,372

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