MOUNTAIN VIEW, California, May 14 (Reuters) - Google

parent Alphabet on Tuesday announced details of how it

is building on artificial intelligence across its businesses,

including improvements to search.

At its annual I/O developer event in Mountain View,

California, CEO Sundar Pichai said the company is rolling out AI

Overviews to all users in the U.S. this week after a long period

of public testing since last year.

The new AI features unveiled on Tuesday will help investors

evaluate Alphabet's progress as it races against Microsoft ( MSFT )

, OpenAI and other competitors to dominate the emerging

technology.

Google also announced improvements to its Gemini Pro 1.5

model that is capable of making sense of a massive amount of

data. On Tuesday, Google said it was doubling that amount, to 2

million tokens, meaning the AI potentially could answer

questions when given thousands of pages of text or more than an

hour of video to ingest in a single prompt.

The Pro model - starting with prompt sizes of up to 1

million tokens, or pieces of data - will also be available to

subscribers to Google's Gemini Advanced service.

AI Overviews uses generative AI to synthesize information

and answer more complex queries for which there is no simple

answer on the Web.

Microsoft ( MSFT )-backed OpenAI on Monday showcased a new AI model

called GPT-4o, which enables ChatGPT to respond via voice in

real time and be interrupted - both hallmarks of realistic voice

conversations that AI voice assistants like Google Assistant

have found challenging.

Shares of Alphabet were up 0.3% on Tuesday afternoon.