readable AI benchmarks (simplified)

readable AI benchmarks

Anthropic

Claude Fable 5.1

reasoning · closed weights · Sep 1, 2026

Claude Fable 5.1 has a Quality Score of 76.9, ranking 3rd among 398 scored models. Per 1M tokens, pricing is $10.00 input, $50.00 output, $0.250 cached input, and $12.50 cache write. It accepts text, image, and pdf input, outputs text, and has a 1M token context window. Its Reliability Score is 71.7, ranking 3rd among 399 scored models, above average (total average: 38.0). Its Value Score is 42.8, high compared with the total Value average of 33.2.

Quality Score76.9coverage 100.0%: AA Intelligence and AA-Omniscience outcomes available
Value Score42.8
Factual reliability71.7
Cache Discount98%

Model specification

Reasoning
reasoning
Input modalities
text, image, pdf
Output modalities
text
Context window
1M tokens
Weights
closed weights

Token prices USD per 1M tokens

Input
$10.00
Output
$50.00
Cached Input
$0.250
Cache write
$12.50
Cost per task
$7.63

Capability

Intelligence
53.4
Coding
not available
Agentic
not available
Omniscience
43.5
Correct
67.2%
Blended price
$7.18

Answer outcomes

Fully graded outcomes (Correct + Incorrect): 91.0%

Correct 67.2%Incorrect 23.8%Partial / not attempted 9.0%

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