Karin Klein

In Gloria Steinem's living room again this week with @FortuneMPW, talking AI and leadership. One idea: this is a moment women are built for. Leading people and automation takes muscles many of us have used our whole careers: juggling, empathy, knowing what only humans do well.

Big congrats to @Bluefish_AI 🐟 who announced a $43M Series B led by @thresholdvc & @NEA with @BloombergBeta continuing from the start. Attention is shifting. Bluefish makes it possible for advertisers to adapt. In <2 years, 10% of Fortune 500 are customers. Smart not to wait.

Big congrats to @Bluefish_AI 🐟 who announced a $43M Series B led by @thresholdvc & @NEA with @BloombergBeta continuing from the start. Attention is shifting. Bluefish makes it possible for advertisers to adapt. In <2 years, 10% of Fortune 500 are customers. Smart not to wait.

@aroraharshita33 Smart move by YC. Great win for founders

The last ~1 year as a visiting partner at YC has been a lot of fun. I got the opportunity to work with some of the smartest and most optimistic builders. Super excited to join as a GP!

vers.sh is now open beta! we got tired of everyone being proud of running 5 claude codes at once. we think you should be running 500.

When I talk to researchers at frontier labs and AI startups, our conversations almost always converge on the same bottleneck: data. Specifically: * finding real world datasets that reflect the tasks we want AI to perform * designing evals and benchmarks that accurately measure capabilities we care about * understanding which data actually moves the scaling curve Love seeing more focus on the data layer of the stack; excited to see what @withprotegeai builds with DataLabs!

New 2026 mission: Hang out in 50 startup offices by year-end in SF/Bay Area. Friends.. who’s got an open door? 😇 I don't use Twitter much, so please tag founders or teams with cool spaces!

Today, we are thrilled to announce that @withprotegeai has raised a new $30M funding round led by @a16z. When @BobbySamuels and former @DatavantHQ co-founder and CEO Travis May first started Protege in 2024, we saw three bottlenecks to AI’s progress — compute, models, and data. Compute has scaled dramatically, models continue to improve, but access to the right data remains the hardest part. That’s why Protege exists: to be the infrastructure for real-world data in AI development. In the few months since our last round of funding, we’ve felt the urgent demand pull across industries, domains, and modalities. We are rapidly expanding to meet those needs. When AI builders come to Protege, they’re looking for real-world data: the most authentic signal of how people and systems actually behave. This is not synthetic data created by AI nor manufactured data created to simulate human behavior. Across every stage of the AI development lifecycle — from pre-training to post-training to fine-tuning to evaluation — AI builders need this data. They’re looking across modalities and industries: healthcare, video, audio, motion capture, gaming, manufacturing, life sciences, real estate, finance, education, and many more. Foundational, multi-modal model-builders (including the majority of the Magnificent Seven) now work with us across multiple domains along with dozens of other model builders. Thanks to @daisydwolf and the rest of the a16z team for joining us on this journey as well as our existing investors also participating in this round — @nbt at @footworkvc, @saarsaar at @CRV, @BloombergBeta, @flexcapital, Shaper Capital, and others. Lastly, a huge thank you to the @withprotegeai team for making this all possible. More details in 🧵! #AIDevelopment #DataInfrastructure #a16z #StartupFunding #Protege

Was fun seeing an elite athlete get into vibe coding because you could see the obsession build up and although we were supposed to shoot for 15 minutes he spent hours building things. Just generating ideas and trying them and he quickly got a feeling for what works.

Can @SHAQ vibe code an app with no coding experience? Vibe coding is easy to start with, but like any other skill, you can learn to master it. That’s why we partnered with @tadeoyerinde and the @campusgrad team to build Vibe Coding 101 for folks who want to master Replit.

Founder & CEO of @Replit @amasad on the 1000x engineer: “The buzzword in Silicon Valley has been the 10x engineer. 2-3 years ago, I talked about the 1000x engineer, highly leveraged by autonomous agents." "You're not just one person, you’re a team of engineers. Every engineer is a sort of manager now." "We're not at 1000x yet. But pretty soon, the difference between a great engineer who knows how to use AI tools and an okay or good one is going to be 100x.”

Come join us at Startup Festivus! 12/5 in SF

and photo credit: thanks @mallun !

From @KamalaHarris to Jamie Dimon, curiosity ruled the stage at the 2025 #FortuneMPW Summit. Loved joining #AmyColeman (@Microsoft), @jess123555 and @mlevram to talk AI readiness and the workforce. Experiment > perfection and everyone should be a vibe coder.

@FortuneMagazine @BloombergBeta Excited to join an amazing lineup at #FortuneMPW to explore how AI is changing what we value at work… and what that means for the future of leadership.

#FortuneMPW is excited to welcome @karinklein, Founding Partner of @BloombergBeta, to our conference October 13–15 in Washington, D.C. See the agenda and full list of speakers here 👉 trib.al/aZp519s

Curious how others are seeing AI change what people value most at work: creativity? connection? meaning? ??

AI isn’t just changing how we work. It’s changing what we value at work. Excited to explore this together with @mlevram, #AmyColeman (@Microsoft), and @jess123555 at #FortuneMPW.

@johnjhorton @BloombergBeta Thank you! We’re grateful to be part of the journey and excited for what’s next.

@karinklein And thank you---it's hard to overstate how helpful & supportive @BloombergBeta has been along the way!

Strong team. Great opportunity 🚀