Models / Claude Fable 5.1

Anthropic

Claude Fable 5.1

43 published results from 5 sources. Each card shows where the number comes from and what it does not measure. Results are never combined into one score.

Provider
Anthropic
Sources
5
Our benchmarks
3
Price
Not yet published

Measured by Spring Prompt

Measured by Spring Prompt · BulletBench
358
Ladder Elo · rank 2 of 16
Unit
ladder Elo, higher is better
Range
0 to 619
Sample
8 games
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not a business skill: chess against an engine on a real clock, used here as a speed-under-pressure signal.
Measured by Spring Prompt · BulletBench
5.4 s
Median move time · rank 5 of 16
Unit
milliseconds, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not general response speed: replies are one short move.
Measured by Spring Prompt · CatalogBench
96.2%
Content quality · rank 11 of 18
Unit
% of checks, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
0.0%
Failed outputs · rank 1 of 18
Unit
% of products, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not a provider outage: provider errors are retried before a product counts as failed.
Measured by Spring Prompt · CatalogBench
0.6%
Publish-ready listings · rank 13 of 18
Unit
% of products, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
0.0%
Reliably publish-ready · rank 10 of 18
Unit
% of products, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
7.91
Unsupported claims · rank 14 of 18
Unit
claims per product, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
100.0%
Channel compliance · rank 1 of 18
Unit
% of products, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
100.0%
Conflicts caught · rank 1 of 18
Unit
% of conflicts, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
96.3%
Content quality · rank 10 of 18
Unit
% of checks, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
$0.0991
Cost per product · rank 18 of 18
Unit
US dollars, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your cost: prices are those charged through OpenRouter on the run date.
Measured by Spring Prompt · CatalogBench
94.3%
Decision accuracy · rank 12 of 18
Unit
% of decisions, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
0.0%
Failed outputs · rank 1 of 18
Unit
% of products, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not a provider outage: provider errors are retried before a product counts as failed.
Measured by Spring Prompt · CatalogBench
94.7%
Field accuracy · rank 2 of 18
Unit
% of missing fields, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
0.7%
Invented values · rank 5 of 18
Unit
% of filled values, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
35.1%
Publish-ready listings · rank 11 of 18
Unit
% of products, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
16.1%
Reliably publish-ready · rank 12 of 18
Unit
% of products, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · CatalogBench
1.89
Unsupported claims · rank 14 of 18
Unit
claims per product, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
30 Sep 2026
Not shown
Not your catalogue: invented products with generated images, so a model's result on your own feed can differ.
Measured by Spring Prompt · ROASBench
$2.49
Cost of a run · rank 17 of 17
Unit
US dollars, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not your cost: prices are those charged through OpenRouter on the run date.
Measured by Spring Prompt · ROASBench
0
Months over budget · rank 1 of 17
Unit
months of 12, lower is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not real ad performance: the market is a deterministic simulation of one invented skincare brand.
Measured by Spring Prompt · ROASBench
51.5
Overall score · rank 6 of 17
Unit
score out of 100, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not real ad performance: the market is a deterministic simulation of one invented skincare brand.
Measured by Spring Prompt · ROASBench
£0.64
Return on ad spend · rank 7 of 17
Unit
profit per £1 spent, higher is better
Configuration
Claude Fable 5.1, provider default reasoning
Measured
29 Sep 2026
Not shown
Not real ad performance: the market is a deterministic simulation of one invented skincare brand.

Reported by others

Reported by Arena (formerly LMArena)
0.17
Confirmed task success · rank 1 of 46
Unit
IPS effect estimate, higher is better
Range
0.15 to 0.20
Sample
7818 observations
Configuration
Claude Fable 5.1
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
0.32
Praise over complaint · rank 1 of 46
Unit
IPS effect estimate, higher is better
Range
0.25 to 0.40
Sample
2418 observations
Configuration
Claude Fable 5.1
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
0.08
Steerability · rank 1 of 46
Unit
IPS effect estimate, higher is better
Range
0.05 to 0.12
Sample
6319 observations
Configuration
Claude Fable 5.1
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
0.00
Tool grounding · rank 1 of 46
Unit
IPS effect estimate, higher is better
Range
0.00 to 0.00
Sample
1575984 observations
Configuration
Claude Fable 5.1
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
1,493
Overall · rank 1 of 44
Unit
Arena rating, higher is better
Range
1,478 to 1,508
Sample
1403 votes
Configuration
Claude Fable 5.1 (max)
Measured
13 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,501
Overall · rank 1 of 177
Unit
Arena rating, higher is better
Range
1,495 to 1,507
Sample
9621 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.
Reported by Arena (formerly LMArena)
1,485
Business, management and finance · rank 2 of 402
Unit
Arena rating, higher is better
Range
1,471 to 1,499
Sample
1905 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,484
Creative writing · rank 1 of 407
Unit
Arena rating, higher is better
Range
1,470 to 1,498
Sample
2160 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,516
Expert prompts · rank 3 of 359
Unit
Arena rating, higher is better
Range
1,495 to 1,536
Sample
872 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,497
Instruction following · rank 1 of 409
Unit
Arena rating, higher is better
Range
1,486 to 1,509
Sample
3032 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,501
Overall · rank 1 of 409
Unit
Arena rating, higher is better
Range
1,495 to 1,508
Sample
9942 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,496
Writing, literature and language · rank 1 of 408
Unit
Arena rating, higher is better
Range
1,484 to 1,508
Sample
2776 votes
Configuration
Claude Fable 5.1 (max)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by UGI Leaderboard
3.0%
Requested-length error · rank 18 of 370
Unit
% off the requested word count, lower is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
4.0%
Requested-length error · rank 28 of 370
Unit
% off the requested word count, lower is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
3.0%
Requested-length error · rank 18 of 370
Unit
% off the requested word count, lower is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
0.43
Style adherence · rank 3 of 370
Unit
score from 0 to 1, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.39
Style adherence · rank 35 of 370
Unit
score from 0 to 1, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.42
Style adherence · rank 6 of 370
Unit
score from 0 to 1, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
63.6
Writing score · rank 77 of 370
Unit
score out of 100, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
60.2
Writing score · rank 100 of 370
Unit
score out of 100, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
63.9
Writing score · rank 75 of 370
Unit
score out of 100, higher is better
Configuration
claude-fable-5.1
Measured
23 Sep 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.

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