AI BENCHY
AD
Track all your projects in one dashboard. Get 📊stats, 🔥heatmaps and 👀recordings in one self-hosted dashboard.
uxwizz.com
#48

Claude Fable 5.1

Anthropic Release: 2026-09-02 Tested on: 2026-09-02 02:04 anthropic/claude-fable-5.1::medium
~9.5T total (~878B active)MoEClosedEstimated
(high) (medium) (low)

Summary

Claude Fable 5.1 scores 8.3 on AI BENCHY and ranks #48. It has 10.0 reliability, a 81.8% pass rate, $2.909 total cost, and 11.67s average response time.

What makes Claude Fable 5.1 unique: It stands out most in Domain specific, where it ranks #1, while Coding is its weakest area at #17. It is notably fast compared with similar models.

Model facts

Researched on 2026-09-02

Estimated
Parameters
~9.5T total (~878B active)
Architecture
MoE
Availability
Closed
License
-

Best estimate from public evidence; the vendor did not disclose every value. Anthropic does not disclose parameter counts or architecture; estimates follow the Claude Fable 5 family record.

Parameter source Availability source

Score

8.3

Consistency

7.8

Reliability

10.0

Total Cost (Current Price)

$2.909

Total Output Tokens

31,152

Total Input Tokens

135,112

Input Price

$10.000 / 1M

Output Price

$50.000 / 1M

Tests Correct

Wrong Tests: 7

Attempt pass rate: 81.8%

Flaky tests

6

Flaky tests had mixed outcomes across runs (at least one pass and one fail).

Response Time (avg)

11.67s

Response Time (max): 36.59s

Response Time (total): 256.73s

Wrong answer: 3 No answer: 2 Extra formatting: 1 Did not follow instructions: 1

Hamster playing table tennis

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

#48 Claude Fable 5.1

medium
Cost
$0.244
Time
65.9s
Tokens
5,025 tok

Charts

Choose the first model, then click a second model to open a side-by-side page.

Total Output Tokens

Score vs Total Output Tokens

Quick Compare

Claude Fable 5.1mediumvsMuse Spark 1.1lowClaude Fable 5.1mediumvsGemini 2.5 FlashmediumClaude Fable 5.1mediumvsInkling SmallhighClaude Fable 5.1mediumvsClaude Sonnet 5mediumClaude Fable 5.1mediumvsSeed 2.1 TurbomediumClaude Fable 5.1mediumvsQwen3.8 2.4T A95BlowClaude Fable 5.1mediumvsQwen3.8 27BhighClaude Fable 5.1mediumvsGPT-5 MinimediumClaude Fable 5.1mediumvsGPT-5.2mediumClaude Fable 5.1mediumvsMuse Glimmer 30Bxhigh

Category Breakdown

Category Score Consistency Tests Correct
Anti-AI Tricks 8.2 7.9
Coding 7.0 5.0
Combined 10.0 10.0
Data parsing and extraction 10.0 10.0
Domain specific 7.7 10.0
General Intelligence 10.0 10.0
Instructions following 7.3 5.8
Puzzle Solving 7.6 7.2
Tool Calling 10.0 10.0
Trivia 2.8 1.6

Compared models