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OpenAI: GPT-5.3-Codex vs StepFun: Step 3.7 Flash

Last updated at: 2026-05-29

Metric GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05 Step 3.7 Flash Step 3.7 Flash low Release: 2026-05-29
Score 8.3 7.4
Rank #17 #60
Reliability 10.0 10.0
Consistency 8.4 8.7
Tests Correct
Attempt pass rate 81.7% 68.3%
Flaky tests 4 3
Total Runs 60 60
Cost per result 4.887 2.796
Total Cost $0.685 $0.336
Input Price $1.750 / 1M $0.200 / 1M
Output Price $14.000 / 1M $1.150 / 1M
Output Tokens 2,336 285,209
Reasoning Tokens 42,565 0
Response Time (avg) 15.95s 16.06s
Response Time (max) 100.93s 124.75s
Response Time (total) 319.08s 321.11s

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Score vs Total Cost

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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
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 240 1,722
Step 3.7 Flash 8.7 7.9 91.7% 1 4.02s 10,896 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 18.45s 514 7,266
Step 3.7 Flash 10.0 10.0 100.0% 0 9.43s 14,569 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 364 2,731
Step 3.7 Flash 10.0 10.0 100.0% 0 7.98s 6,426 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 234 728
Step 3.7 Flash 7.3 5.8 83.3% 1 2.29s 2,667 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 64 25,308
Step 3.7 Flash 5.3 7.2 44.4% 1 43.31s 104,487 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 187 331
Step 3.7 Flash 3.4 9.3 0.0% 0 7.00s 4,604 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 93 693
Step 3.7 Flash 9.8 10.0 100.0% 0 1.58s 1,857 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.05s 356 1,593
Step 3.7 Flash 5.5 9.9 33.3% 0 1.84s 3,564 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 254 492
Step 3.7 Flash 10.0 10.0 100.0% 0 3.25s 1,360 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 30 1,701
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 134,779 0

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