Artificial intelligence · 2011

Siri

A voice assistant ships to millions of phones.

Siri grew out of SRI's DARPA-funded CALO project and launched on the iPhone 4S in October 2011. It made talking to a computer a mainstream habit and was followed by Google Now, Cortana and Alexa.

See it in the living tree Wikipedia

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 2

Smartphone 2007
Statistical speech recognition 1975

Related measurements

The dashed line marks when it first worked.

Training compute of notable AI models Source: Epoch AI, Notable AI Models (CC BY 4.0)

Mobile phone subscriptions per 100 people Latest: 112 per 100 people (2025) Source: Our World in Data