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Claude Fable 5.1 (low) vs GPT-5.5

GPT-5.5 leads on average score with 7.0 vs 6.9. GPT-5.5 has the lower benchmark cost at $0.544 vs $2.565. GPT-5.5 is faster at 2.35s vs 10.33s, with pass rates of 56.1% vs 59.1%.

Last updated at: 2026-09-02

Rank
#130
Total Output Tokens
24,375
Response Time (avg)
10.33s
Total Cost
$2.565
Rank
#124
Total Output Tokens
4,915
Response Time (avg)
2.35s
Total Cost
$0.544
Recommended model GPT-5.5

It has the best score here (7.0), while costing about 4.7x less than Claude Fable 5.1 (low).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 low Release: 2026-09-02 GPT-5.5 GPT-5.5 none Release: 2026-04-24
Score 6.9 7.0
Rank #130 #124
Reliability 10.0 10.0
Consistency 9.2 9.2
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 56.1% 59.1%
Flaky tests 2 2
Total Runs 66 66
Cost per result 23.315 4.533
Total Cost $2.565 $0.544
Input Price $10.000 / 1M $5.000 / 1M
Output Price $50.000 / 1M $30.000 / 1M
Total Input Tokens 134,582 79,294
Output Tokens 8,955 4,915
Reasoning Tokens 15,420 0
Response Time (avg) 10.33s 2.35s
Response Time (max) 33.10s 12.24s
Response Time (total) 227.37s 51.78s
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.

#130 Claude Fable 5.1

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

#124 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 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
GPT-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0

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