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OpenAI: GPT-5.4 Mini vs StepFun: Step 3.5 Flash

Step 3.5 Flash (medium) leads on average score with 6.0 vs 5.9. GPT-5.4 Mini has the lower benchmark cost at $0.095 vs $0.108. GPT-5.4 Mini is faster at 1.53s vs 174.22s, with pass rates of 33.3% vs 51.5%.

Recommended modelGPT-5.4 MiniIts score stays close to the best score here (5.9 vs 6.0), while responding about 113.6x faster than Step 3.5 Flash (medium).

Last updated at: 2026-07-17

Metric GPT-5.4 Mini GPT-5.4 Mini none Release: 2026-03-17 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 5.9 6.0
Rank #129 #123
Reliability 10.0 9.2
Consistency 8.9 9.0
Tests Correct
Attempt pass rate 33.3% 51.5%
Flaky tests 3 1
Total Runs 66 63
Cost per result 1.580 0.540
Total Cost $0.095 $0.108
Input Price $0.750 / 1M $0.100 / 1M
Output Price $4.500 / 1M $0.300 / 1M
Total Input Tokens 79,067 65,707
Output Tokens 7,880 108,561
Reasoning Tokens 0 293,993
Response Time (avg) 1.53s 174.22s
Response Time (max) 9.92s 1597.85s
Response Time (total) 33.74s 2613.32s

Hamster playing table tennis

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

#129 GPT-5.4 Mini

none
Cost
$0.010
Time
11.7s
Tokens
2,151 tok

#123 Step 3.5 Flash

medium
Cost
$0.008
Time
277.1s
Tokens
23,695 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

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.4 Mini 5.5 10.0 33.3% 0 913ms 7,305 401 0
Step 3.5 Flash 2.4 5.2 0.0% 0 258.38s 2,211 13,207 22,429

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