Claude Sonnet 5.5

Intelligence

166.7 ECI

90% range: 163.58 to 171.34 on the Epoch Capabilities Index.

Price per million tokens

Input

$2

Output

$10

Cached input

$0.10

Blended

$4

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

On our coding tasks

Mean cost per task

$0.10 at list price

Mean output tokens

2,325

Time per task

28.6 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.