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Claude Fable 5.1 (high) vs GPT-5.5 (medium)

The average score is effectively tied at 9.0 vs 9.0. Claude Fable 5.1 (high) has the lower benchmark cost at $3.364 vs $4.163. Claude Fable 5.1 (high) is faster at 13.59s vs 38.97s, with pass rates of 89.4% vs 87.9%.

Last updated at: 2026-09-02

Rank
#18
Total Output Tokens
40,071
Response Time (avg)
13.59s
Total Cost
$3.364
Rank
#20
Total Output Tokens
125,316
Response Time (avg)
38.97s
Total Cost
$4.163
Recommended model Claude Fable 5.1 (high)

It has the best score here (9.0), while responding about 2.9x faster than GPT-5.5 (medium).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 high Release: 2026-09-02 GPT-5.5 GPT-5.5 medium Release: 2026-04-24
Score 9.0 9.0
Rank #18 #20
Reliability 10.0 10.0
Consistency 9.6 8.9
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 89.4% 87.9%
Flaky tests 1 3
Total Runs 66 66
Cost per result 17.701 23.127
Total Cost $3.364 $4.163
Input Price $10.000 / 1M $5.000 / 1M
Output Price $50.000 / 1M $30.000 / 1M
Total Input Tokens 135,958 80,668
Output Tokens 7,930 5,617
Reasoning Tokens 32,141 119,699
Response Time (avg) 13.59s 38.97s
Response Time (max) 40.17s 332.10s
Response Time (total) 298.90s 857.43s
Parameters ~9.5T total (~878B active) ~1.5T total (~100B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#18 Claude Fable 5.1

high
Cost
$0.384
Time
102.5s
Tokens
7,824 tok

#20 GPT-5.5

medium
Cost
$0.112
Time
71.9s
Tokens
3,807 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 8.4 7.4 88.9% 1 13.91s 10,608 520 6,503
GPT-5.5 8.8 7.8 88.9% 1 59.77s 7,305 362 24,959

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