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OpenAI: GPT-5.4 vs StepFun: Step 3.5 Flash

Step 3.5 Flash (medium) leads on average score with 6.0 vs 5.8. Step 3.5 Flash (medium) has the lower benchmark cost at $0.108 vs $0.397. GPT-5.4 is faster at 2.07s vs 174.22s, with pass rates of 34.9% vs 51.5%.

Recommended modelGPT-5.4Its score stays close to the best score here (5.8 vs 6.0), while responding about 84.2x faster than Step 3.5 Flash (medium).

Last updated at: 2026-07-18

Metric GPT-5.4 GPT-5.4 none Release: 2026-03-05 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 5.8 6.0
Rank #135 #126
Reliability 10.0 9.2
Consistency 9.2 9.0
Tests Correct
Attempt pass rate 34.9% 51.5%
Flaky tests 2 1
Total Runs 66 63
Cost per result 5.663 0.540
Total Cost $0.397 $0.108
Input Price $2.500 / 1M $0.100 / 1M
Output Price $15.000 / 1M $0.300 / 1M
Total Input Tokens 108,632 65,707
Output Tokens 8,321 108,561
Reasoning Tokens 0 293,993
Response Time (avg) 2.07s 174.22s
Response Time (max) 15.63s 1597.85s
Response Time (total) 45.51s 2613.32s

Hamster playing table tennis

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

#135 GPT-5.4

none
Cost
$0.026
Time
18.1s
Tokens
1,792 tok

#126 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 5.5 10.0 33.3% 0 1.62s 7,305 516 0
Step 3.5 Flash 2.4 5.2 0.0% 0 258.38s 2,211 13,207 22,429

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