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Claude Opus 4.8 vs Mercury 2.5 Preview (medium)

The average score is effectively tied at 6.9 vs 6.8. Mercury 2.5 Preview (medium) has the lower benchmark cost at $0.037 vs $2.334. Mercury 2.5 Preview (medium) is faster at 6.66s vs 7.54s, with pass rates of 60.9% vs 66.7%.

Last updated at: 2026-10-01

Compared models

Rank
#167
Total Output Tokens
24,343
Response Time (avg)
7.54s
Total Cost
$2.334
Rank
#171
Total Output Tokens
150,107
Response Time (avg)
6.66s
Total Cost
$0.037
Recommended model Mercury 2.5 Preview (medium)

It has the best score here (6.8), while costing about 63.8x less than Claude Opus 4.8.

Detailed comparison

Metric Claude Opus 4.8 Claude Opus 4.8 none Release: 2026-05-28 Mercury 2.5 Preview Mercury 2.5 Preview medium Release: 2026-09-02
Score 6.9 6.8
Rank #167 #171
Reliability 10.0 10.0
Consistency 9.3 9.6
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 60.9% 66.7%
Flaky tests 2 1
Total Runs 69 69
Cost per result 17.953 0.244
Total Cost $2.334 $0.037
Input Price $5.000 / 1M $0.000 / 1M
Output Price $25.000 / 1M $0.000 / 1M
Total Input Tokens 345,059 397,291
Output Tokens 24,343 6,355
Reasoning Tokens 0 143,752
Response Time (avg) 7.54s 6.66s
Response Time (max) 65.07s 74.63s
Response Time (total) 173.31s 153.29s
Parameters ~5T total (~500B active) ~100B
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#167 Claude Opus 4.8

none
Cost
$0.053
Time
22.0s
Tokens
2,253 tok

#171 Mercury 2.5 Preview

medium
Cost
$0.001
Time
2.7s
Tokens
2,241 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
Claude Opus 4.8 5.5 10.0 33.3% 0 3.29s 10,590 1,332 0
Mercury 2.5 Preview 7.8 10.0 66.7% 0 3.86s 7,839 552 22,126

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