Arno

@elonmusk @DannyLimanseta wonder what a god is trying to learn

@DannyLimanseta For the same reason we run simulations: to observe interesting outcomes. That’s why the most interesting outcome, especially if ironically entertaining, is the most likely: all the boring simulations were terminated.

I had dinner once with a top physicist and a top computer scientist and asked what they thought the probability was that we were in a simulation. They answered simultaneously at 0% and 100% respectively. It was like a double-slit experiment, but with humans.

There's no such things as the ai singularity. Specifically you cannot define the point of singularity. Was it the transformers paper or was it when the humans first made fire that truly kicks it off? And no point in the curve can we tell we are at the inflection point because all points on the curve look like inflections points.

@ebbyamir @xai Yooo what

Today was my last day at @xAI. My mission here was to introduce Grok to the world by helping create an inspiring brand, build beautiful products, launch the best voice mode, and most importantly grow the incredible team that made it all happen. These past two years have been exhilarating, gratifying, and unforgettable – we achieved the impossible again and again, with the most talented and dedicated people I’ve ever worked with. To @elonmusk, thank you for the opportunity, the mentorship, and the adventure of a lifetime – it’s been an honor. To the team, I’ll be rooting for you and can’t wait to see what you accomplish next. As xAI begins its next chapter, I’m ready for a new one as well. I’m excited to spend some time seeking new inspirations, reflecting on what I’ve learned, and exploring what comes next.

@JaimeAlns @xai 🫡 it was great working with you Jaime!

It’s one of those: today was my last day at @xAI. xAI has been a tremendous formative experience for me, building the API, Grok.com, and everything in between, it’s been crazy and hectic, but overall amazing. I’m especially grateful to everyone I’ve worked with, @TobyPhln and the team in London, you’re the most talented team I’ve ever worked with. I’ll be cheering from the sidelines, really excited to see what the xAI team is going to come up with next!

log (😅) = 💧log 😄

@wwzeng1 @SpaceX @xai Welcome :)

I'm excited to join @SpaceX and @xai to build the future of coding. The opportunity for impact at xAI is monumental. By solving autonomous engineering, we’ll be able to accelerate our progress towards the future and reveal new secrets about the universe. Over the last few years I've worked on the first open source AI coding agent and the number one rated plugin for JetBrains. Now I'm excited to join the world's most ambitious team to advance Al coding. If you want to join this incredible team - my DMs are open!

The oracle has spoken

@Guodzh @pranjalssh It was great working with you guodong!

Last day at xAI. Wild journey past three years but excited about next chapter. Thanks all for the love and support yesterday. So many friends made along the way and I will miss you all!

@TobyPhln Building grok.com with amazing people was probably the best experience I've had as a developer

Contrary to what most Reddit mods and some journalists want you to believe, Elon is actually deeply involved in all aspects of technical development at xAI. However, his engagement deepened over time. In the early days, we largely self-organized the day-to-day work. Exceptionally talented and highly motivated people love solving difficult problems. They’re almost addicted to being the ones who publish the paper, write the library, or release the product. Chasing success is the most intellectual form of narcissism. These people don’t just seek challenging environments; they can create them. Not intentionally but implicitly. If you’re an S-tier gamer, you don’t waste time doing the tutorial. You play on the most extreme difficulty level. And if your team is stacked, you may end up with an environment that doesn’t just celebrate exceptional abilities; it necessitates them. Self-sufficiency and thriving in ambiguity are some of the most important qualities of great engineers. You can trust them to independently find answers to difficult questions and make progress without supervision. But trust (just like hope) is not a strategy. If everyone thrives in ambiguity, everyone will repeatedly find similar but distinct answers to the same questions. Over time, it causes major misalignment. There is no sole reason it took so long to launch grok .com. The delay simply was circumstantial and unintentional. The important lesson extends beyond this narrow example: When starting a company, create an environment that is simple. Don’t leave important questions unanswered, actively minimize the skills needed for being productive, make sure everyone’s energy is focused on making progress in the same direction. Complexity kills progress and misalignment causes stagnation.

14 months passed between announcing Grok and launching grok .com. It’s an uncharacteristic delay for a company that values speed above all else. It taught me an important lesson about complexity, alignment, and the importance of leadership.

@SeongsikKi5837 @xai It was great working with you Joseph!

Friday was my last day at @xAI. It truly was a wild ride—pushing the frontier on Grok 3, Grok 4, Grok 4.1 Fast and Macrohard. Grateful to have been on this rocketship, working with the most intense, brilliant people I’ve ever met. Ad astra 🚀

@0xtigs Def skill.md s

MCPs are the future

@TobyPhln @xai @elonmusk 🐐 will miss the warroom meetings, gl on your next venture! 🫡

Three years, thousands of PRs, and a million jokes. Today was my last day @xai. To the team: you rock, no one burns the midnight oil better. To @elonmusk, thanks for taking me on board. I've learnt more about execution, speed, and product perfectionism than I could ever have imagined. Thanks for everything. My next priorities: sleep for more than 8h, write down all the things I've learnt (I have a list), and then think about what I want to do next. @gork wdyt?

"wow, foreign actors using claude building military and surveillance capacities, sounds serious" actual targets: reasoning, rubric-based grading, data analysis, coding

@Yuhu_ai_ 🫡

I resigned from xAI today. This company - and the family we became - will stay with me forever. I will deeply miss the people, the warrooms, and all those battles we have fought together. It's time for my next chapter. It is an era with full possibilities: a small team armed with AIs can move mountains and redefine what's possible. Thank you to the entire xAI family. Onward. 🚀 And to Elon @elonmusk - thank you for believing in the mission and for the ride of a lifetime.

@jimmybajimmyba @elonmusk 🫡

Last day at xAI. xAI's mission is push humanity up the Kardashev tech tree. Grateful to have helped cofound at the start. And enormous thanks to @elonmusk for bringing us together on this incredible journey. So proud of what the xAI team has done and will continue to stay close as a friend of the team. Thank you all for the grind together. The people and camaraderie are the real treasures at this place. We are heading to an age of 100x productivity with the right tools. Recursive self improvement loops likely go live in the next 12mo. It’s time to recalibrate my gradient on the big picture. 2026 is gonna be insane and likely the busiest (and most consequential) year for the future of our species.

@TheGregYang Get well soon Greg. We'll miss you during the late nights

I've been suffering from Lyme disease. I'm stepping back from xAI into an informal advisory role so I can go founder mode on my health, starting today. --- The symptoms started when I got sick (cold, flu, or COVID -- I'm not sure which) in early 2025. I distinctly felt less energetic, less creative, and less agentic even weeks after "recovery." After that, my condition ebbed and flowed, but the lows kept getting lower. Accidentally eating the wrong thing would make me extremely tired, taking days to recover. Working out would leave my whole body feeble for days. There was a week where I slept 12 hours a day and still couldn't recover. Lyme is famously hard to diagnose, but luckily I have an incredible doctor. He suspected these symptoms, far from being just in my head, indicated immune issues. Detective work over a few rounds of testing revealed I have Lyme disease. I was very surprised because Lyme is said to come from tick bites (where the bump looks like a target), but I don't ever remember having one. Likely I contracted Lyme a long time ago, but until I pushed myself hard building xAI and weakened my immune system, the symptoms weren't noticeable. --- Overall, I actually feel lucky to have discovered this early. Lyme is a serious disease that only gets harder to treat with age -- patients discovering it in their 50s or 60s have a much tougher time. Lyme can also be debilitating, leaving its victims bedridden, but luckily I'm still functional and can take care of myself day to day. So while some folks have said "you shouldn't have pushed yourself so hard," I'm glad I did. I found this issue early, and now I can fix it so I can push myself even harder when I rebound. --- Chronic Lyme is not well understood in the literature or by the public. For folks suffering from it, it can be a lonely fight. But I hope my story can make it just a little less lonely.

@techdevnotes Calm outside, dying inside

xAI quiet lately Is it the calm

Founding engs always have a good trauma story or two, here to support <3

@0xtigs Wait use grok I can give u free sub

CHATGPT DOWN KMS WORK IS CANCELED

@nikitabier Shareholder value

In 2 words, what is your purpose in life?