Claude Fable 5.1

Intelligence

166.4 ECI

90% range: 163.61 to 170.75 on the Epoch Capabilities Index.

Price per million tokens

Input

$10

Output

$50

Cached input

$0.25

Blended

$20

From the lab's price page, checked 2026-11-01.

On our coding tasks

Mean cost per task

$0.52 at list price

Mean output tokens

2,186

Time per task

38.9 s median

Included tasks passed

18 of 18

Interrupted attempts excluded

0

Run with

Claude Code headless, effort high, 2026-11-01

Historical plan observations

No historical plan observation is linked to this model.

Historical observations do not establish current-tier allowances. Allowance dates, ranges and assumptions.