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

Summary

GPT-5.3-Codex (medium) vs Step 3.7 Flash (low) benchmark comparison: GPT-5.3-Codex (medium) leads on average score with 8.9 vs 7.7. Step 3.7 Flash (low) has the lower benchmark cost at $0.341 vs $0.740. Step 3.7 Flash (low) is faster at 15.74s vs 16.22s, with pass rates of 82.5% vs 68.3%.

Recommended model: GPT-5.3-Codex (medium) - It has the strongest score in this comparison (8.9) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-10

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 8.9 7.7
Rank #13 #50
Reliability 10.0 10.0
Consistency 8.5 8.4
Tests Correct
Attempt pass rate 82.5% 68.3%
Flaky tests 4 4
Total Runs 63 63
Cost per result 4.932 2.840
Total Cost $0.740 $0.341
Input Price $1.750 / 1M $0.200 / 1M
Output Price $14.000 / 1M $1.150 / 1M
Total Input Tokens 34,299 40,101
Output Tokens 2,357 289,325
Reasoning Tokens 46,189 0
Response Time (avg) 16.22s 15.74s
Response Time (max) 100.93s 124.75s
Response Time (total) 340.67s 330.63s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#13 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 tok

#50 Step 3.7 Flash

low
Invalid SVG
Cost
$0.004
Time
25.3s
Tokens
3,072 tok

Top Models by Score

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) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 606 240 1,722
Step 3.7 Flash 8.7 7.9 91.7% 1 4.02s 756 10,896 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890
Step 3.7 Flash 8.2 7.2 88.9% 1 9.46s 7,437 18,685 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 11,019 364 2,731
Step 3.7 Flash 10.0 10.0 100.0% 0 7.98s 13,683 6,426 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 7,140 234 728
Step 3.7 Flash 7.3 5.8 83.3% 1 2.29s 7,398 2,667 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 813 64 25,308
Step 3.7 Flash 5.3 7.2 44.4% 1 43.31s 828 104,487 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 477 187 331
Step 3.7 Flash 3.4 9.3 0.0% 0 7.00s 525 4,604 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 660 93 693
Step 3.7 Flash 9.8 10.0 100.0% 0 1.58s 735 1,857 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.05s 642 356 1,593
Step 3.7 Flash 5.5 9.9 33.3% 0 1.84s 756 3,564 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 5,445 254 492
Step 3.7 Flash 10.0 10.0 100.0% 0 3.25s 7,746 1,360 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.3-Codex 2.8 1.6 33.3% 1 14.43s 195 30 1,701
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 237 134,779 0

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