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Claude Fable 5.1 (low) vs Mercury 2 (medium)

Mercury 2 (medium) leads on average score with 7.0 vs 6.9. Mercury 2 (medium) has the lower benchmark cost at $0.094 vs $2.565. Mercury 2 (medium) is faster at 2.95s vs 10.33s, with pass rates of 56.1% vs 53.0%.

Last updated at: 2026-09-02

Rank
#130
Total Output Tokens
24,375
Response Time (avg)
10.33s
Total Cost
$2.565
Rank
#125
Total Output Tokens
87,554
Response Time (avg)
2.95s
Total Cost
$0.094
Recommended model Mercury 2 (medium)

It has the best score here (7.0), while costing about 27.5x less than Claude Fable 5.1 (low).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 low Release: 2026-09-02 Mercury 2 Mercury 2 medium Release: 2026-02-24
Score 6.9 7.0
Rank #130 #125
Reliability 10.0 10.0
Consistency 9.2 8.4
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 56.1% 53.0%
Flaky tests 2 4
Total Runs 66 66
Cost per result 23.315 0.933
Total Cost $2.565 $0.094
Input Price $10.000 / 1M $0.250 / 1M
Output Price $50.000 / 1M $0.750 / 1M
Total Input Tokens 134,582 110,515
Output Tokens 8,955 10,325
Reasoning Tokens 15,420 77,229
Response Time (avg) 10.33s 2.95s
Response Time (max) 33.10s 14.63s
Response Time (total) 227.37s 61.89s
Parameters ~9.5T total (~878B active) ~100B
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#130 Claude Fable 5.1

low
Cost
$0.126
Time
28.5s
Tokens
2,652 tok

#125 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 Fable 5.1 3.4 10.0 0.0% 0 6.75s 10,608 1,753 0
Mercury 2 8.2 7.7 77.8% 1 2.04s 7,065 296 11,328

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