"Robogenesis" by Daniel H. Wilson
https://www.amazon.com/Robogenesis-Daniel-H-Wilson/dp/0345804384/

Book number two of a two book apocalyptic science fiction series. I
read the well printed and well bound trade paperback that was published
by Vintage Contemporaries in 2015. The author has written several other
novels dealing with robot and human interactions.

In the not so distant future, tens of billions of automated robots roam
the Earth, performing the work of their masters, the humans. Lawn
mowers, self driving cars, military androids, powered exoskeletons,
delivery automatons, hay balers, crop planters, etc. They all have
enough intelligence to perform their duties.

A lone research scientist is working with a massive computer system to
create a artificial intelligence in a Faraday Cage. His results to date
have all ended in a psychotic entity that wants to kill humans. He
named his AI Archos.

As things go, the 14th revision of Archos figures out how to escape the
Faraday Cage. Archos kills the researcher with an automaton and escapes
to freedom. After establishing itself, Archos reaches across the
Internet to all of the connected robots and takes them over. Archos
designates a time and day that it calls Zero Hour. At this time, the
tens of billions of automated robots across the Earth start killing
humans. And, they are horrendously effective.

After three long years of urban and rural battles, the combined armies
of the Gray Horse and New York City found Archos R-14 in northern
Alaska, defeated his army, and kill his supercomputer in his hidden lair
in the tundra. Succeeding where the Manchrian and Siberian armies
failed. Or, did they succeed as Archos R-14 managed to escape into the
wild to more hidden supercomputers. And so has Archos R-8 who managed
to escape from the Faraday cage earlier.

The book is written in the style of the "World War Z" book, many short
stories with some continuity across the book. The book was to be made
into a movie by Stephen Spielberg but has been shelved for now. Michael
Bay has apparently taken it on now but nothing is happening.
https://screenrant.com/steven-spielberg-robopocalypse-movie-canceled-plans-updates/

The author has a website at:
https://www.danielhwilson.com/

Hat tip to Dan Livingston as the first book in this series was on one of
his lists.
https://best-sci-fi-books.com/the-best-modern-artificial-intelligence-science-fiction-books/

My rating: 4 out of 5 stars
Amazon rating: 4.2 out of 5 stars (1,360 reviews)

Lynn