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Claude Fable 5.1 (medium) vs GPT-6 Luna (high)

The average score is effectively tied at 8.3 vs 8.3. GPT-6 Luna (high) has the lower benchmark cost at $0.054 vs $2.909. Claude Fable 5.1 (medium) is faster at 11.67s vs 17.53s, with pass rates of 81.8% vs 75.8%.

Last updated at: 2026-09-23

Compared models

Rank
#74
Total Output Tokens
31,152
Response Time (avg)
11.67s
Total Cost
$2.909
Rank
#73
Total Output Tokens
91,405
Response Time (avg)
17.53s
Total Cost
$0.054
Recommended model GPT-6 Luna (high)

It has the best score here (8.3), while costing about 54.1x less than Claude Fable 5.1 (medium).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 medium Release: 2026-09-02 GPT-6 Luna GPT-6 Luna high Release: 2026-09-23
Score 8.3 8.3
Rank #74 #73
Reliability 10.0 10.0
Consistency 7.8 9.0
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 81.8% 75.8%
Flaky tests 6 3
Total Runs 66 66
Cost per result 19.392 0.359
Total Cost $2.909 $0.054
Input Price $10.000 / 1M $0.100 / 1M
Output Price $50.000 / 1M $0.500 / 1M
Total Input Tokens 135,112 80,441
Output Tokens 7,594 4,761
Reasoning Tokens 23,558 86,644
Response Time (avg) 11.67s 17.53s
Response Time (max) 36.59s 106.93s
Response Time (total) 256.73s 385.74s
Parameters ~9.5T total (~878B active) ~400B total (~17B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#74 Claude Fable 5.1

medium
Cost
$0.244
Time
65.9s
Tokens
5,025 tok

#73 GPT-6 Luna

high
Cost
$0.003
Time
49.2s
Tokens
5,231 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 7.0 5.0 77.8% 2 10.99s 10,608 525 4,376
GPT-6 Luna 7.8 7.4 77.8% 1 24.69s 7,302 483 15,691

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