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Anthropic: Claude Sonnet 4.6 vs StepFun: Step 3.5 Flash

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Last updated at: 2026-03-06

Metric Anthropic: Claude Sonnet 4.6 none Release: 2026-02-17 StepFun: Step 3.5 Flash medium Release: 2026-02-01 Free Available
Rank #25 #13
Avg Score 6.8 7.4
Consistency 9.6 9.1
Cost per result 2.504 0.000
Total Cost $0.251 $0.000
Tests Correct
Attempt pass rate 66.7% 68.8%
Flaky tests 1 2
Total Runs 48 (16 x 3) 48 (16 x 3)
Output Tokens 6,895 71,452
Reasoning Tokens 0 155,147
Response Time (avg) 5.57s 29.10s
Response Time (max) 23.84s 170.45s
Response Time (total) 50.12s 290.96s

Top Models by Score

Score vs Total Cost

Response Time (avg)

Avg Score vs Response Time (avg)

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Anthropic: Claude Sonnet 4.6 4.0 10.0 33.3% 0 4.83s 1,199 0
StepFun: Step 3.5 Flash 10.0 10.0 100.0% 0 18.54s 13,924 17,208
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Anthropic: Claude Sonnet 4.6 9.0 10.0 100.0% 0 23.84s 3,766 0
StepFun: 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
Anthropic: Claude Sonnet 4.6 9.9 10.0 100.0% 0 3.43s 252 0
StepFun: 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
Anthropic: Claude Sonnet 4.6 7.0 10.0 66.7% 0 3.54s 413 0
StepFun: Step 3.5 Flash 4.0 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
Anthropic: Claude Sonnet 4.6 5.0 3.1 66.7% 1 2.56s 192 0
StepFun: Step 3.5 Flash 6.0 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
Anthropic: Claude Sonnet 4.6 5.5 10.0 50.0% 0 1.96s 90 0
StepFun: Step 3.5 Flash 9.0 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
Anthropic: Claude Sonnet 4.6 7.0 10.0 66.7% 0 2.92s 536 0
StepFun: Step 3.5 Flash 4.0 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
Anthropic: Claude Sonnet 4.6 10.0 10.0 100.0% 0 4.11s 447 0
StepFun: Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802

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