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Claude Sonnet 5.5 (medium) vs Mercury 2 (medium)

Mercury 2 (medium) leads on average score with 6.6 vs 6.5. Mercury 2 (medium) has the lower benchmark cost at $0.121 vs $1.100. Mercury 2 (medium) is faster at 4.40s vs 8.03s, with pass rates of 40.6% vs 53.6%.

Last updated at: 2026-10-17

Compared models

Rank
#222
Total Output Tokens
37,748
Response Time (avg)
8.03s
Total Cost
$1.100
Rank
#218
Total Output Tokens
96,943
Response Time (avg)
4.40s
Total Cost
$0.121
Recommended model Mercury 2 (medium)

It has the best score here (6.6), while costing about 9.2x 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 Mercury 2 medium Release: 2026-02-24
Score 6.5 6.6
Rank #222 #218
Reliability 10.0 10.0
Consistency 9.7 8.1
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 40.6% 53.6%
Flaky tests 1 5
Total Runs 69 69
Cost per result 12.221 1.201
Total Cost $1.100 $0.121
Input Price $2.000 / 1M $0.250 / 1M
Output Price $10.000 / 1M $0.750 / 1M
Cache Read Price $0.200 / 1M $0.025 / 1M
Cache Write Price $2.500 / 1M N/A
Total Input Tokens 361,183 189,300
Output Tokens 26,609 10,854
Reasoning Tokens 11,139 86,089
Response Time (avg) 8.03s 4.40s
Response Time (max) 51.18s 34.92s
Response Time (total) 184.80s 96.81s
Parameters ~1T total (~100B active) ~100B
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#222 Claude Sonnet 5.5

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

#218 Mercury 2

medium
Cost
$0.002
Time
2.1s
Tokens
1,702 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 8.2 7.7 77.8% 1 2.04s 7,065 296 11,328

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