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Inception: Mercury 2 vs OpenAI: GPT-5.6 Terra

Summary

Mercury 2 (medium) vs GPT-5.6 Terra (low) benchmark comparison: GPT-5.6 Terra (low) leads on average score with 7.7 vs 7.5. Mercury 2 (medium) has the lower benchmark cost at $0.058 vs $0.343. Mercury 2 (medium) is faster at 2.24s vs 4.88s, with pass rates of 54.0% vs 74.6%.

Recommended model: Mercury 2 (medium) - Its score stays close to the best score here (7.5 vs 7.7), while costing about 5.9x less than GPT-5.6 Terra (low).

Last updated at: 2026-07-09

Metric Mercury 2 Mercury 2 medium Release: 2026-02-24 GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 7.5 7.7
Rank #56 #47
Reliability 10.0 10.0
Consistency 8.8 8.1
Tests Correct
Attempt pass rate 54.0% 74.6%
Flaky tests 3 5
Total Runs 63 63
Cost per result 0.578 2.637
Total Cost $0.058 $0.343
Input Price $0.250 / 1M $2.500 / 1M
Output Price $0.750 / 1M $15.000 / 1M
Total Input Tokens 35,116 34,226
Output Tokens 4,048 1,943
Reasoning Tokens 61,219 15,201
Response Time (avg) 2.24s 4.88s
Response Time (max) 14.63s 19.85s
Response Time (total) 44.72s 102.53s

Generation showcase

Hamster playing table tennis

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

#56 Mercury 2

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

#47 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 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

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 6.9 9.9 50.0% 0 1.12s 554 2,546 2,609
GPT-5.6 Terra 8.3 10.0 75.0% 0 2.36s 606 171 602
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-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 10.0 10.0 100.0% 0 3.28s 12,909 268 4,887
GPT-5.6 Terra 10.0 10.0 100.0% 0 5.07s 11,019 312 349
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 7.3 5.9 83.3% 1 1.11s 6,234 183 1,656
GPT-5.6 Terra 10.0 10.0 100.0% 0 919ms 7,140 222 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 2.9 7.2 11.1% 1 6.48s 695 41 30,754
GPT-5.6 Terra 5.3 7.2 44.4% 1 8.34s 723 72 4,086
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 4.8 10.0 0.0% 0 821ms 456 137 542
GPT-5.6 Terra 4.8 3.2 33.3% 1 3.52s 477 105 249
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 10.0 10.0 100.0% 0 1.07s 340 14 958
GPT-5.6 Terra 10.0 10.0 100.0% 0 1.48s 660 87 134
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 5.4 10.0 33.3% 0 949ms 601 361 2,781
GPT-5.6 Terra 10.0 10.0 100.0% 0 4.46s 642 259 1,506
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 10.0 10.0 100.0% 0 1.89s 6,080 180 1,956
GPT-5.6 Terra 4.7 1.6 66.7% 1 6.69s 5,462 257 226
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Mercury 2 3.0 10.0 0.0% 0 2.58s 182 22 3,748
GPT-5.6 Terra 3.0 10.0 0.0% 0 5.95s 195 29 1,228

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