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Mercury 2.5 Preview (medium) vs GPT 5.3 Chat

The average score is effectively tied at 7.5 vs 7.5. Mercury 2.5 Preview (medium) has the lower benchmark cost at $0.024 vs $0.533. Mercury 2.5 Preview (medium) is faster at 3.58s vs 6.56s, with pass rates of 69.7% vs 65.2%.

Last updated at: 2026-09-02

Rank
#91
Total Output Tokens
127,034
Response Time (avg)
3.58s
Total Cost
$0.024
Rank
#88
Total Output Tokens
28,179
Response Time (avg)
6.56s
Total Cost
$0.533
Recommended model Mercury 2.5 Preview (medium)

It has the best score here (7.5), while costing about 22.6x less than GPT 5.3 Chat.

Detailed comparison

Metric Mercury 2.5 Preview Mercury 2.5 Preview medium Release: 2026-09-02 GPT 5.3 Chat GPT 5.3 Chat none Release: 2026-03-03
Score 7.5 7.5
Rank #91 #88
Reliability 10.0 10.0
Consistency 9.6 8.6
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 69.7% 65.2%
Flaky tests 1 4
Total Runs 66 66
Cost per result 0.158 4.097
Total Cost $0.024 $0.533
Input Price $0.040 / 1M $1.750 / 1M
Output Price $0.150 / 1M $14.000 / 1M
Total Input Tokens 112,713 78,846
Output Tokens 5,436 28,179
Reasoning Tokens 121,598 0
Response Time (avg) 3.58s 6.56s
Response Time (max) 17.84s 18.33s
Response Time (total) 78.66s 137.77s
Parameters ~100B ~400B total (~17B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#91 Mercury 2.5 Preview

medium
Cost
$0.001
Time
2.7s
Tokens
2,241 tok

#88 GPT 5.3 Chat

none
Cost
$0.008
Time
8.1s
Tokens
634 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
Mercury 2.5 Preview 7.8 10.0 66.7% 0 3.86s 7,839 552 22,126
GPT 5.3 Chat 5.6 4.7 55.6% 2 10.52s 7,302 6,632 0

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