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Claude Sonnet 5.5 (medium) vs Mercury 2.5 Preview (high)

The average score is effectively tied at 6.5 vs 6.5. Mercury 2.5 Preview (high) has the lower benchmark cost at $0.039 vs $1.100. Mercury 2.5 Preview (high) is faster at 7.61s vs 8.03s, with pass rates of 40.6% vs 65.2%.

Last updated at: 2026-10-01

Compared models

Rank
#192
Total Output Tokens
37,748
Response Time (avg)
8.03s
Total Cost
$1.100
Rank
#194
Total Output Tokens
180,597
Response Time (avg)
7.61s
Total Cost
$0.039
Recommended model Mercury 2.5 Preview (high)

It has the best score here (6.5), while costing about 28.8x less than Claude Sonnet 5.5 (medium).

Detailed comparison

Metric Claude Sonnet 5.5 Claude Sonnet 5.5 medium Release: 2026-09-29 Mercury 2.5 Preview Mercury 2.5 Preview high Release: 2026-09-02
Score 6.5 6.5
Rank #192 #194
Reliability 10.0 9.9
Consistency 9.7 8.0
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 40.6% 65.2%
Flaky tests 1 6
Total Runs 69 69
Cost per result 12.221 0.319
Total Cost $1.100 $0.039
Input Price $2.000 / 1M $0.000 / 1M
Output Price $10.000 / 1M $0.000 / 1M
Total Input Tokens 361,183 298,512
Output Tokens 26,609 3,178
Reasoning Tokens 11,139 177,419
Response Time (avg) 8.03s 7.61s
Response Time (max) 51.18s 86.84s
Response Time (total) 184.80s 175.08s
Parameters ~1T total (~100B active) ~100B
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#192 Claude Sonnet 5.5

medium
Cost
$0.024
Time
17.4s
Tokens
2,525 tok

#194 Mercury 2.5 Preview

high
Cost
$0.001
Time
4.5s
Tokens
3,851 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 Sonnet 5.5 3.4 9.7 0.0% 0 6.07s 10,608 6,767 0
Mercury 2.5 Preview 6.7 7.8 55.6% 1 6.13s 7,751 485 42,569

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