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Mercury 2 (medium) vs GPT-5.5

GPT-5.5 leads on average score with 6.6 vs 6.6. Mercury 2 (medium) has the lower benchmark cost at $0.121 vs $1.212. Mercury 2 (medium) is faster at 4.40s vs 4.75s, with pass rates of 53.6% vs 56.5%.

Last updated at: 2026-10-19

Compared models

Rank
#223
Total Output Tokens
96,943
Response Time (avg)
4.40s
Total Cost
$0.121
Rank
#219
Total Output Tokens
6,197
Response Time (avg)
4.75s
Total Cost
$1.212
Recommended model Mercury 2 (medium)

Its score stays close to the best score here (6.6 vs 6.6), while costing about 10.1x less than GPT-5.5.

Detailed comparison

Metric Mercury 2 Mercury 2 medium Release: 2026-02-24 GPT-5.5 GPT-5.5 none Release: 2026-04-24
Score 6.6 6.6
Rank #223 #219
Reliability 10.0 10.0
Consistency 8.1 9.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 53.6% 56.5%
Flaky tests 5 2
Total Runs 69 69
Cost per result 1.201 10.096
Total Cost $0.121 $1.212
Input Price $0.250 / 1M $5.000 / 1M
Output Price $0.750 / 1M $30.000 / 1M
Cache Read Price $0.025 / 1M $0.500 / 1M
Cache Write Price N/A N/A
Total Input Tokens 189,300 205,108
Output Tokens 10,854 6,197
Reasoning Tokens 86,089 0
Response Time (avg) 4.40s 4.75s
Response Time (max) 34.92s 57.53s
Response Time (total) 96.81s 109.31s
Parameters ~100B ~1.5T total (~100B active)
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.

#223 Mercury 2

medium
Cost
$0.002
Time
2.1s
Tokens
1,702 tok

#219 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 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 8.2 7.7 77.8% 1 2.04s 7,065 296 11,328
GPT-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0

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