Was Ultron preparing for Thanos?

Ultron was not designed to defend the earth against Thanos. The Avengers had no clue Thanos in particular even existed until Banner was sent back to earth to warn the Avengers he was on his way by Heimdal. Ultron was designed to help defend the earth and was designed with Chituari level (or below) threats in mind.

Is Ultron connected to Thanos?

Nothing’s been said about Thanos being connected to Ultron. The fact that it appeared in avengers: age of ultron didn’t have to do with the events of that film. It was an advertisement for the next avengers movie, avengers: infinity war. Ultron has no connection.

Did Ultron know about the Infinity Stones?

How did Infinity Ultron recognize the Infinity Stones? Presumably, he managed to understand and find one the true nature of the Mind Stone. Once he did, he recognised the other Infinity Stones too.

Can Thanos beat Ultron?

In a one-on-one fight, Thanos could easily break through Ultron’s armored body and destroy him. Ultron’s weaponry combine Stark and Chitauri technology, and while his energy blasts are deadly, they still wouldn’t be enough to defeat Thanos.