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

GPT-5.5 (low) leads on average score with 9.3 vs 9.0. GPT-5.5 (low) has the lower benchmark cost at $1.257 vs $3.364. GPT-5.5 (low) is faster at 10.15s vs 13.59s, with pass rates of 89.4% vs 86.4%.

Last updated at: 2026-09-02

Rank
#20
Total Output Tokens
40,071
Response Time (avg)
13.59s
Total Cost
$3.364
Rank
#11
Total Output Tokens
28,540
Response Time (avg)
10.15s
Total Cost
$1.257
Recommended model GPT-5.5 (low)

It has the best score here (9.3), while costing about 2.7x less than Claude Fable 5.1 (high).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 high Release: 2026-09-02 GPT-5.5 GPT-5.5 low Release: 2026-04-24
Score 9.0 9.3
Rank #20 #11
Reliability 10.0 10.0
Consistency 9.6 10.0
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 89.4% 86.4%
Flaky tests 1 0
Total Runs 66 66
Cost per result 17.701 6.614
Total Cost $3.364 $1.257
Input Price $10.000 / 1M $5.000 / 1M
Output Price $50.000 / 1M $30.000 / 1M
Total Input Tokens 135,958 80,067
Output Tokens 7,930 5,378
Reasoning Tokens 32,141 23,162
Response Time (avg) 13.59s 10.15s
Response Time (max) 40.17s 56.19s
Response Time (total) 298.90s 223.24s
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.

#20 Claude Fable 5.1

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

#11 GPT-5.5

low
Cost
$0.068
Time
37.0s
Tokens
2,339 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 10.0 10.0 100.0% 0 15.04s 7,302 423 6,402

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