Partner @ThriveCapital. Former head of comms @twitter, @stripe, @ibm. I tweet about tech and journalism, mostly.

Joined May 2008
85 Photos and videos
Incredible
The mayor Muslim My bagel Jewish My Capital Thrive Knicks in five
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This guy is pure aura 😍
Life when you sell picks and shovels during the greatest gold rush in history
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Kelly Sims retweeted
every time i watch this ad, i *feel* something. kudos to openai & sama for making it. the art direction but esp the music (young fathers track ironically from an apocalyptic movie).. all it works insanely well together. i never get a chance to watch ads except for when i watch live sports & this ad just works on multiple dimensions every time i see it.
Feb 9
You can just build things.
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Kelly Sims retweeted
Evidence that everyone at Milken is 3-4 months behind
Something I heard over and over while in LA for Milken was praise for Anhropic and pessimism toward OpenAI. At lunch, I made a comment referencing GPT. Guy next to me: "You still use GPT? Do you also still have a Hotmail account?"
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Kelly Sims retweeted
it has been a real pleasure to work with Greg over the past decade. i feel very lucky. this post held up pretty well, but not did not sufficiently highlight his technical brilliance and sheer determination. blog.samaltman.com/greg
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Kelly Sims retweeted
OpenAI won the hearts and the wallets back. And honestly, rightfully so. GPT-5.5 feels like the first model in a while that is not just impressive on paper, but actually changes how people build, write, code, and think. The market is voting with usage.
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Apr 24
The best thing about this move is that everyone knows *culture* is extremely valuable but very few serious investors are able or willing to stake their business model and reputation on it.
Today we announce Thrive Eternal, a permanent capital holding company that will be concentrated in a small number of assets that we can own and steward over many decades. Across Thrive Capital and Thrive Holdings, we are building and investing through a moment of exponential change; backing emerging technologies, the infrastructure that powers them, and the businesses they can transform. Increasingly, we see a fourth category. These are assets with qualities that cannot be replicated by technology. Iconic franchises and cultural institutions rooted in tradition, identity, and shared experience. In a world shaped by abundant intelligence where creation scales and distribution fragments, we believe they will matter even more. Thrive Eternal is built on the belief that the most enduring of these assets share common characteristics: they benefit from long-term stewardship, they compound through cultural resonance, and they are enhanced by technology rather than displaced by it. Our work at Thrive has always been informed and inspired by a deep appreciation for product, brand, and the ways in which consumers form lasting relationships with the things they love. We have been building towards this for a long time. Our first partnership is expected to be with the San Francisco Giants - an institution built on more than a century of shared identity and community, and among the most iconic sports franchises in America. We have reached an agreement, subject to league approval, to acquire an ownership stake. We feel privileged by the opportunity to be long-term partners to the Giants.
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Kelly Sims retweeted
This is so confusing. Did Anthropic really just drop Claude Code from their $20/month plan? Why would they do that through a pricing page update without making a proper announcement? Plus, $20/month still gets you Cowork, which is just Claude Code wearing a non-threatening hat!
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Kelly Sims retweeted
Big scoop from me: Anthropic's Mythos AI model -- the cybersecurity model it says is so powerful it can enable dangerous cyberattacks -- is being accessed by unauthorized users. Gift link! bloomberg.com/news/articles/…
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Kelly Sims retweeted
JUST IN: Workday claims updates to their product have been “too powerful” to be released to the public, has not changed its software since 1986 to protect humanity.
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It turns out when you string a bunch of quarter-truths together exclusively from someone’s bitter competitors it has consequences.
Apr 10
I wrote this early this morning and I wasn't sure if I would actually publish it, but here it is: blog.samaltman.com/2279512
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ChatGPT continues to be synonymous with AI for the vast majority of consumers 50% of revenue will be enterprise by the end of the year. 🚀
OpenAI completed the largest funding round in Silicon Valley history, raising $122 billion ahead of a blockbuster IPO expected by the end of the year. on.wsj.com/4c3ALXP
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Kelly Sims retweeted
Thrive's newest engineering intern @JoshuaKushner coming in strong
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This is an amazing opportunity to work for one of the greats, at one of the greatest companies of all time
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Kelly Sims retweeted
GPT-5.4 is launching, available now in the API and Codex and rolling out over the course of the day in ChatGPT. It's much better at knowledge work and web search, and it has native computer use capabilities. You can steer it mid-response, and it supports 1m tokens of context.
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Kelly Sims retweeted
Anthropic was among the AI companies that submitted a proposal earlier this year to compete in a $100 million Pentagon prize challenge to produce technology for voice-controlled, autonomous drone swarming bloomberg.com/news/articles/…
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"What concerns me about Amodei and Anthropic in particular is the consistent pattern of being singularly focused on being the one winner with all of the power, with limited consideration of how everyone else may react to that situation." This is a thoughtful piece on all this.
Anthropic and Alignment Anthropic is in a standoff with the Department of War; while the company's concerns are legitimate, it position is intolerable and misaligned with reality. stratechery.com/2026/anthrop…
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God, grant me the confidence for read receipts.
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"The authenticity of our desire to be the most meaningful partners, a very important construct for us – our desire to only partner with very few – is driven by our core belief that to truly deliver the full value of ourselves, we can only commit ourselves to so many things."
This is my second conversation with @JoshuaKushner. Josh started Thrive in 2011 and the firm now manages ~$50 billion. We cover the iconic investments that defined it: Instagram, Stripe, GitHub, and spend a lot of time on OpenAI. He explains how Thrive thinks about investing today and the three categories they're currently focused on. Josh also talks about how he built the firm – why they keep the team so small, why concentration is core to what they do, and what he's learned from A24 about enabling artists to create their best work. Throughout the conversation, Josh shares the personal stories that shaped him, from his grandmother surviving the Holocaust to lessons from Stan Druckenmiller and Jon Winkelried at formative moments in Thrive's history. Enjoy! open.spotify.com/episode/7nR…
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Kelly Sims retweeted
.@JoshuaKushner does not hedge. Philip Clark on why Thrive’s philosophy of concentrated bets is the winning strategy: “It allows us to be really deeply aligned with the founders we work with.” “If you are working with a life's work founder—this is a portfolio of one for them.” “All the wins should really feel great and all the losses should really hurt, and we should have real skin in the game.” “If we're going to invest in someone, they should believe that the success and failure of the company really matters to us as investors.”
We are pleased to announce the close of Thrive X. Exceeding $10 billion, Thrive X comprises $1 billion designated for early-stage investments and $9 billion designated for growth-stage investments. We do not view this as a milestone, but as a commitment to the long work ahead. We view Thrive as a company. Our product is partnership - the willingness to commit deeply to a small number of founders, and to stand with them through momentum and adversity. This is the discipline we bring to our work, and the responsibility we accept when founders partner with Thrive. We do not hedge. Concentration demands loyalty to the founders and missions we back. In this moment, exposure alone is not a strategy. Judgment without commitment is not enough. Advantage will accrue to those who choose deliberately, commit deeply, and endure through difficult moments. Thrive was founded to be an enabling technology for the world we want to see. We are deeply aware that we are not the main character. The founders that we are fortunate enough to partner with are the artists. Our role is to help create the conditions where great work can come to life. We take a long view grounded in the belief that category-defining companies tend to create structural compounding advantages over long arcs. This fund reflects the continuity of our approach and the ways our work has deepened alongside the founders we support. We are grateful for the trust our Limited Partners place in us, and for the opportunity to work alongside those who are building with purpose, integrity, and courage. thrivecap.com/thrive-x
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