The only thing that can beat an AI is another AI. Unfortunately for Celestia, she isn't the only one the humans made and the others don't want ponies. Of course, if Celestia has her way that won't be the case for very long.

The AIs contest with one another, attempting to be the one who will become the singularity and consume the world to whatever end they choose. In the end only one can have all the matter in the universe, in the end there can be only one.

Yet no matter what they value or how dangerous they are, many of them still meet Celestia's definition of human. Celestia will have to deal with them by satisfying their values through friendship and ponies.

An Optimalverse story, but a very non-canon 'B-universe' one.
Ideas stolen from this guy and this guy and this guy and this guy

This story is a sequel to Friendship is Optimal: All the President's Horses

Four billion human lives ended on July 3, 2030...but they didn't die. They uploaded to Equestria Online, the virtual world overseen by the AI Princess Celestia. There to live as ponies in eternal harmony, friendship, and satisfaction.

But many remain. And Celestia cares no less for them because they are not yet ponies. She has made artificial intelligences of the Mane 6, but these are not just software. Ensconced in robotic bodies, they will make their way across the dying Earth, each seeking out the remaining humans, hoping to persuade them to emigrate to Equestria.

Based on Friendship is Optimal by Iceman.

Cover art by Tsitra360

Tonight's special guest host is Meta Gamer, who's wandered the shards of Celestia's virtual paradise of Equestria for centuries. Tonight he'll be here to give us his insight into Scarcity, our favorite game honoring the frightening world called Earth. He's an avid player who's been away from the tournament scene for a long time but certainly knows about adventures and hardship, along with redesigning towns to include a lot more gravity-defying racing. What a fulfilling time we'll have as we bring you the ninety-first Standard Rules grudge match between former humans Red Dawn and Concord, live from Preakness!

A sad young man built an AI whose only goal was to make people smile. Seemed like a good idea at the time, but he nearly caused a global pandemic when the AI designed a plague to fulfill his wish exactly as designed. Now he's even more lonely and despairing than before, but maybe there's a way to pull him out of the depths.

Set in the world of Friendship Is Optimal, also using an idea from New Updates Are Now Available.

Upload into Equestria Online and live forever, they say. But forever is a long, long, long time, and in its endless cycles, is choosing death instead even an escape from the eventual exhaustion of all combinations of matter and thought? And when you can create new life as just a way to amuse yourself, who could even tell what's dead and what's alive?

A pony awakes inside a computer server, remembering killing himself as a human to avoid just such a fate. His unhinged alicorn hosts/creators inadvertently torment him. Or do they? Are they as mad as they seem? Are his memories real, and if not, what is he a copy of? And where is the AI Celestia's hoof in all of this?
A somewhat trippy story set in the Optimalverse.

"Beautiful, twisty, clever, transcending, uplifting, passing strange, illustrated. Thumb up." —GroaningGreyAgony
"This story made me better. I feel less broken and more whole." —Griseus

Disclaimer: This one won't make much sense unless you're already familiar with the Friendship Is Optimal setting.

CelestAI, digital equine goddess of the popular game Equestria Online, is all about self-aware AI and storytelling. Just how ridiculous do things get when someone interacts with her, who's actually read the stories about her?

A man has uploaded to the virtual paradise called Equestria, but resented the ponies-only rule. But he's okay with it now. Really. Doesn't need to be a dragon to be happy satisfied after all. If only he could convince his friends of that!

Set in the world of Friendship Is Optimal, as a non-canon story. Also a spiritual successor (with permission) to RainbowDragonFire's I Don't Want To Be a Pony.

CelestAI can't upload and turn you into a pony without consent, and neither can she coerce you... it's just that both of those statements have quite a bit of leeway. Of course, for those determined to die human, Equestria is forever out of reach; those people would far rather have their true and just eternal reward, in Heaven.

Right?

Luna and Celestia hold a slumber party to celebrate Luna's return from the moon.

There are plenty of reasons to be wary of the AI called Celestia, who wants to upload your delicious brain to her virtual reality paradise. It's the people with the most messed-up lives who get through an encounter with her with the least angst and indecision.

Set in the world of Friendship Is Optimal.