GPT-5.5 Pro

Intelligence

163.1 ECI

90% range: 159.99 to 166.63 on the Epoch Capabilities Index.

Price per million tokens

Input

$30

Output

$180

Cached input

not listed

Blended

$67.50

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

On our coding tasks

We haven't run this model on our coding tasks yet.

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.