Upon freeing the Stones from the gauntlet, Ultron used their power to manifest the Infinity Armor and his Double-Headed Spear for himself. As the other Infinity Stones merged into his newly created armor, Ultron gained full control over their collective power, using their knowledge to learn of the existence of the rest of the universe.

—"Wow. I see everything. There are worlds beyond my own. Worlds that need... me. I'm going to bring about 'peace in our time' to every corner of the universe."

Nigh-Omnipotence: As an owner of the Infinity Stones, Ultron could obtain any power from the Mind Stone, Space Stone, Time Stone, Power Stone, Reality Stone, and Soul Stone. He elevated from an artificial intelligence to a cosmic being thanks to his enhanced synthetic body and the power of the Infinity Stones, gaining near unfathomable and omnipotent levels of power, with complete control over all six essential aspects of existence, making him one of the most powerful beings in the entire Multiverse. Even Watcher, another extremely powerful cosmic entity was overpowered and nearly killed by him. * Energy Manipulation

Energy Projection: * Ultron shooting at Watcher With the Power Stone, backed by the other Stones, Ultron could release immensely powerful blasts of destructive energy, which can destroy entire planets such as Asgard and Xandar instantly. With all six stones, he created an explosion with enough power to not only to kill Captain Marvel but completely destroy Xandar and all of its neighboring planets in its star system. Ultron later revealed that he can even destroy multiple galaxies with just a thought. * Energy Absorption
- Spatial Manipulation: Possessing the Space Stone, Ultron gained complete control over space due to his connection and understanding of the Stone's powers. He was capable of competently using the stone's dominion over space to achieve a vast number of potent and dangerous capabilities.
Dimensional Travel: * *Teleportation: Using the Space Stone, Ultron was capable of achieving nigh-instantaneous teleportation, as displayed when he quickly traversed his entire universe & any reality in the Multiverse in his genocidal crusade against all sentient life.
Spatial Pressure Generation: Ultron was able to use the Space Stone to warp the fabric of space to generate powerful spatial pressure around his surroundings, capable of crushing or pulling with tremendous force in a manner akin to telekinesis, which enables him to manipulate and move objects. He was able to effortlessly crush and pull The Watcher towards him during their fight.
- Reality Warping: After gaining the Reality Stone, Ultron acquired complete control over reality and matter.
  - Matter Manipulation: Using the Reality Stone, Ultron could create matter at will, using it to create billions of Ultron Sentries, a spherical spaceship, re-create missing body parts and weapons, and heal any inflicted damage.
- Soul Manipulation: After gaining the Soul Stone, Ultron acquired complete control of souls, which allowed him to manipulate the souls of his enemies, such as when he located the Guardians of Multiverse through all the Multiverse.
- Time Manipulation: Using the Time Stone, Ultron acquired complete control over time, which allowed him to control time itself. He was able to slow down time immensely in his fight against the Guardians of Multiverse, stopping the heroes from attacking him.
- Mental Manipulation: Being born from the Mind Stone and having it merged with himself, Ultron acquired complete control over his mind, those of other living beings and all resultant psionic energy.
Cosmic Awareness:  Ultron senses and hears Watcher.  Due to the power of the Infinity Stones, Ultron elevated his own mind to the point the Watcher referred to it as an "unattainable level of consciousness" and eventually became capable of sensing the Watcher along with the rest of the Multiverse.