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Anthropic: Claude Opus 4.8 vs StepFun: Step 3.5 Flash

Last updated at: 2026-05-28

Metric Claude Opus 4.8 Claude Opus 4.8 none Release: 2026-05-28 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 7.3 7.4
Rank #63 #59
Reliability 10.0 10.0
Consistency 9.2 9.1
Tests Correct
Attempt pass rate 65.0% 62.3%
Flaky tests 2 2
Total Runs 60 57
Cost per result 4.324 0.133
Total Cost $0.519 $0.062
Input Price $5.000 / 1M $0.090 / 1M
Output Price $25.000 / 1M $0.300 / 1M
Output Tokens 8,098 90,478
Reasoning Tokens 0 173,544
Response Time (avg) 3.51s 43.20s
Response Time (max) 17.73s 170.45s
Response Time (total) 70.19s 561.54s

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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) Output Tokens Reasoning Tokens
Claude Opus 4.8 6.5 10.0 50.0% 0 3.40s 1,472 0
Step 3.5 Flash 10.0 10.0 100.0% 0 40.57s 20,391 24,176
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 6.8 10.0 50.0% 0 3.59s 1,323 0
Step 3.5 Flash 3.0 6.0 50.0% 1 62.83s 12,098 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 9.5 10.0 100.0% 0 17.73s 3,259 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 Opus 4.8 7.3 5.8 83.3% 1 1.77s 308 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 Opus 4.8 5.3 7.2 44.4% 1 1.66s 61 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 Opus 4.8 10.0 10.0 100.0% 0 3.48s 230 0
Step 3.5 Flash 5.5 10.0 0.0% 0 22.39s 240 3,506
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 9.9 10.0 100.0% 0 1.37s 95 0
Step 3.5 Flash 8.3 10.0 50.0% 0 4.78s 2,364 3,521
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 7.7 10.0 66.7% 0 2.74s 783 0
Step 3.5 Flash 5.3 10.0 33.3% 0 7.22s 5,630 10,861
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 5.35s 355 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 3.0 10.0 0.0% 0 3.41s 212 0
Step 3.5 Flash 3.0 10.0 0.0% 0 108.45s 2,354 10,372

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