Will McCarthy retweeted
Exclusive: Inside @baseten
The $13B startup at the centre of the biggest fight in AI - Open vs Closed.
We spent a day at their SF HQ with co-founder & CEO Tuhin Srivastava, Charlie O'Neill, Mudith Jayasekara and the Base Labs team - to understand why they're building an open ecosystem.
Backed by top VCs led by @saranormous @altcap @apoorv03 @wmccarthy11 @saammotamedi @nikiscevak @lachygroom @willreed + more. Plus participation from @nvidia.
0:00 The Open vs Closed AI War
2:18 A Billion AI Requests a Day
3:43 The Best Models Are Chinese
4:06 Tuhin: Don't Rent Intelligence
5:09 Sachin & Tuhin Talk Cricket
6:02 Tuhin: The Real Bottleneck
10:15 Why Launch Base Labs?
11:35 "You Have to Have an Opinion"
12:52 Centralised Control Is the Danger
13:07 Publish Everything, Even Fails
15:08 Hugging Face & the 6-Month Gap
16:10 Why We Still Need Closed
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Will McCarthy retweeted
OpenAI serving open-source models through Baseten is a big deal. They are embracing open source.
Until now, OpenAI's pitch was "use our models."
Now it is "commit your annual AI budget to us". We will get you the best model for each job, whether it's ours, someone else's, or open source.
So if you're a large bank looking to commit $100M in AI spend, you centralize with OpenAI. One throat to choke. GPT handles the credit memos. Open-source handles the KYC volume at a fraction of the cost. A post-trained / specialized model handles fraud.
This changes OpenAI's position. It stops competing only on whose model is best this season and starts competing to own the enterprise AI budget. A layer above being just an AI lab.
Also proves AI is positive sum, not zero sum between closed and open source!
Will McCarthy retweeted
I started the Invest America Act / @TrumpAccounts w my kids @LincGerstner & @JackGerstner_ around a simple dream - that EVERY child / every citizen should directly own a piece of America’s great economic upside. 3.7 M kids getting investment acccts at birth each yr seeded w $1000.
I am grateful for the amazing bi-partisan support - and the vision & courage of @realDonaldTrump that made them a reality. 8 million kids today have accts & soon will be all 73 MILLION kids directly owning a piece of America’s best companies.
Today it was our family’s great honor to pay it forward to kids in Indiana - a state that has given so much to me.
And it was especially fun to get this note from my niece - a school teacher in Indiana - & to know how much this means to her daughter Memphis. 🇺🇸🤍🚀
💥💥💥 from @altcap
All-In Summit: Brad Gerstner
-- Who’s Paying for AI CapEx?
-- Semis Eat the Nasdaq
-- Not Firing, Just Not Hiring
-- The Gigawatt Gap
++ much more!
(0:00) Welcome @altcap
(1:01) Trump Accounts, Every Child a Capitalist & The CAC Scan
(5:07) Can AI revenue pay for the CapEx?
(8:53) The Build Out Issue: Gigawatts, TAM, Token Growth, and Margin Expansion
(12:30) The risks: AI regulation, the nuclear precedent, power limits, and rising rates
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Will McCarthy retweeted
Replying to @CNBC
@CNBC Halftime Report with Altimeter founder & CEO Brad Gerstner (@altcap) and Scott Wapner (@TheJudgeCNBC) | September 11, 2026
On this week's AI safety debate, here are Brad’s views:
> No one in AI is saying full steam ahead, disregard safety. More time and energy has gone into safety ahead of this technology than any prior cycle in 25 years
> The guardrails already exist: lab safety systems, national security coordination, transparency reporting, and a frontier model framework that scrutinizes models before public release
> There is risk in the alternative. We shut down 67 nuclear reactors over fears that never materialized. China is building 100 fission reactors
📽️: youtube.com/watch?si=3FN5IdW…
Will McCarthy retweeted
Excited for Altimeter portfolio company @HQ_Covenant to emerge from stealth with $250m in funding and ~$150m in orders.
Deep precision strike is one of the most critical capability gaps facing the West.
Covenant has built Anthem to close that gap and meet the need for long-range, heavy payloads, precision, and mass production.
Proud to back Michael and the truly special Covenant team as they bring Anthem to the world.
Today, Covenant is emerging from stealth and introducing Anthem: a heavy-payload deep precision strike capability designed for mass production, with deliveries beginning in the thousands in 2027.
We’ve raised $250 million, flown Anthem in more than 200 tests, and secured approximately $150 million in orders, including contracts with the U.S. Army, U.S. Navy, and key international allies.
We’re building Anthem at our 105,000-square-foot production facility in Dallas, alongside factories in Germany and Israel.
Covenant is backed by @a16z, @foundersfund, @Lux_Capital, @lightspeedvp, @8vc, @aleph, and @AltimeterCap.
Deep precision strike is the biggest gap in the arsenal of the West, and we spent the last two years building Anthem to fill it.
Now we deliver at scale.
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The pace at which @mohitaron and the @scifinai team are executing is second to none.
As a Founder of 2 decacorns w/ @nutanix and @Cohesity, Mohit is on to #3 to help revenue teams make sense of ever growing data that sits fragmented across systems... a problem he experienced first hand while scaling BOTH companies past $1B in revenue!!
Could not be more excited to be a part of team SciFin. If you're looking to level up your rev org, reach out! 🚀🫡
Today, SciFin comes out of stealth.
We’ve raised $44M in funding, including a seed round co-led by @AltimeterCap and @MadronaVentures , with @FoundationCap , S32, @ZettaVentures , and others.
We’re building a system of reality for revenue teams. Here’s why 🧵
Will McCarthy retweeted
Castelion has earned trust and credibility by demonstrating technology that creates an asymmetric advantage and can be built at speed, cost, and scale.
They’ve turned ambitious promises into flight-tested hardware and real production capacity for critical national security priorities.
We believe they’re building one of the most important defense companies of this generation.
Pumped to double down and proud to keep backing this exceptional team. 🇺🇸
Castelion is proud to announce our $1 billion Series C. We’re growing fast and our mission hasn't changed: build the weapons required to deter the next major war, affordably, rapidly, and at massive scale.
This funding accelerates Blackbeard production, develops a longer-range strike system, and starts work on defensive systems.
Thank you to @JPMorgan Chase's Strategic Investment Group, @a16z, @OneCarlyle, @lightspeedvp, @LavrockVC, @AltimeterCap, @TRowePrice, @generalcatalyst, and #Interlagos for backing that work. castelion.com/news/series-c/
Will McCarthy retweeted
The reality is what we are seeing unfold is Nvidia speedrunning the creation of a synthetic hyperscaler.
Apologies in advance to all the investors who are stuck in their priors that this will trigger.
But what is a hyperscaler? Strip it down and it’s a scaled infrastructure collective of CPUs, networking, storage with a development platform on top. It fulfills two purposes. Financial: it pools and smooths the financial obligations of its users, renting infrastructure as opex instead of capex. And Operational: it builds software that makes consumption the underlying primitives simple by abstracting them away.
The hyperscaler makes a healthy 35-40% operating margin by buying hardware at bulk pricing, pooling scale to get a lower cost of capital, and driving utilization of that hardware with software that shares and shards workloads across many customers.
But in the age of AI, the atomic units of compute changed. Training (massive coherent clusters) and inference (agentic workloads) - require a fundamentally different configuration of resources. These new workloads require dramatically more accelerated compute, shifting the design target from multi-tenant utilization (the cloud era) to absolute workload performance (the AI era). The economics of the data center inverted. A giant, redundant fleet of Amazon Basics CPUs and storage doesn’t work when the job is synchronous training and one straggling node stalls the entire cluster. For inference, tokens per watt and time to first token dominate the economics, not how many VMs you can pack in a box. And none of it works in a world of limited power (at least in the West. Maybe in China).
As Nvidia built more compute and sold it to the hyperscalers, it faced a fundamental problem. The hyperscalers had classic innovator’s dilemma - expecting 35-40%+ op margin, along with an underlying desire to commoditize Nvidia's 75% GMs with their Amazon Basics equivalent. Pay an ASIC vendor a 25% margin instead of Jensen’s 75%, then stack your own 40% on top! They owned the customer relationships too, enterprises developed on AWS, Azure, GCP and their data was captive there too. But most important of all, these companies moved at their own pace. They were not scrappy or hungry to operate at the pace Nvidia or the AI labs felt was necessary to build out compute to fulfill the demand in front of them. They would never look at retrofitting a 35MW site outside of Ashburn, Virginia!
Meanwhile, a group of hungry entrepreneurs noticed the fat margins the hyperscalers earned renting what was basically stock Nvidia hardware with limited software on top, and started building businesses around it. Nvidia - skeptically at first - recognized that working with these partners would lead to faster development cycles and competitive fires and pressures for the ecosystem. Thus the neoclouds were born.
The software these neoclouds co-developed with Nvidia were purpose built for the new workloads. They solved the new problems and requirements operating the new infrastructure needed. They were ready with hotswaps, they did predictive maintenance, they built new storage software that was built for training with cheaper ingress and egress fees, because their competitive drive was to win workloads, not to lock in enterprise data on their platform. And it was working - AI labs started preferring to work with them over the hyperscalers. Common complaints on the incumbents: too slow, too particular with how their clusters were built, virtualization and networking overlays that made GPU clusters underperform stock Nvidia reference designs. Neocloud bare metal was cheaper too as their teams built AI software, not a cloud data warehouse business. And they were happy to run at half the margin (~20%) that the big guys would never accept.
But the hyperscalers still had one structural advantage: their balance sheets. Investment grade. Able to fund speculative capacity ahead of demand and rent it out at much higher spot rates. The neoclouds couldn’t play that game as lenders would only finance hardware that was already contracted with offtake. And more expensive if that offtake were the labs which at an earlier point were much more speculative. If only they could build ahead of demand, they could maybe earn the kind of returns Elon is achieving on Colossus.
But the twist is that balance sheet edge is eroding in real time. Google just printed its first negative-FCF quarter and raised $50B equity. Microsoft is carrying $329B of leases signed but not yet commenced. Even the IG balance sheets hit the wall - more capital had to come from somewhere else.
And that's how we got to where we are today. Look at what Nvidia has actually built. The operational half of a hyperscaler: DSX OS and Mission Control to run and operate GPU fleets, DSX reference designs and Omniverse digital twins as hardened playbooks for building a data center itself. Dynamo for inference serving. All the old secret sauces of the hyperscalers built specifically for new age data centers that they have led the way in architecting. Offered to any hungry, technically competent team with a serviceable site.
And then the financing half: the revenue share and credit support model that smooths utilization across a distributed fleet the way multi-tenancy used to. Support the operator, release capacity to demand, share in upside, and now bring $500B of third-party capital to the table. Nvidia standardized the asset with reference designs, proved the compute was “fungible and transferable across customers and operators” and showed infrastructure investors DD unlevered yields across 7-8% hurdles. Those investors wet their beaks on early special situation financings, saw the paybacks, and understood the demand was global. That’s why Jensen spent 2025 flying around Europe, the Middle East, and Southeast Asia - these are the ground zero for new compute sites. The reality is that this didn’t happen just over the last 3 months. CoreWeave master agreement in 2023, the $6B spot reserve backstop in 2025 (to sponsor capacity for the inference clouds), the Blackrock AI Infrastructure Partnership in 2024, Brookfield’s $100B fund with Nvidia in 2025, KKR Helix with Nvidia in 2026. And now six independent financing platforms. Chess!
So now the three fears by name. Circularity? Monday was the opposite with Apollo, BlackRock, Blackstone, Brookfield, Goldman Sachs, and KKR bringing third party capital, independently underwritten apart from one another, replacing Nvidia’s balance sheet rather than just extending it. Useful lives / underwritability of these assets? CoreWeave just disclussed A100s, 6 year old silicon contracted through 2029 and pushed 25% price increase on its fleet in July. The collateral is aging more like an aircraft than a smartphone as feared. Market share? If you don’t see that the platform of Nvidia and the fungibility of this compute is the reason why this is even possible - the skeptics themselves are making the bull argument. The complaint that these platforms keep capital tethered to Nvidia and away from other ASICs / accelerators… $500B that can only buy Nvidia reference architecture is a moat dressed up as a risk.
So what were you doing when the first synthetic hyperscaler was built under your nose? :)
All views expressed are my personal views. Does not reflect the views of Altimeter or Nvidia or anyone else. Full disclosure I/we may hold positions in companies mentioned. Purely for discourse and thinking - no financial advice.
Will McCarthy retweeted
Very excited to partner with Volta and join the board alongside @RaghuRaghuram / @shangdaxu from @a16z.
We've partnered with Volta at every round of financing, from their first to their most recent. AI is the biggest trend of our lifetime, and the infrastructure buildout that's coming to support it could end up >5% annual GDP. Building AI infrastructure is incredibly hard to do well, and even harder to do on time. We don't think there's a team better positioned to attack this opportunity than cofounders Ricard Boada and Sofia Gumuzio.
Ricard once sent me a text that said "Nothing as joyful in this life as owning powered land." He was built for this :)
Onward!
A new AI cloud company has raised $300 million in venture funding bloomberg.com/news/articles/…
Will McCarthy retweeted
Congrats to the @permisosecurity team!
And big day for @ekriessmann. Big round for @K2SpaceCo and the Permiso acquisition
Congrats to @permisosecurity on their acquisition by @okta!
I've had the opportunity to work closely with @jlm_sec @paulsnguyening since leading their Series A. What they've built is special, and I've deeply appreciated the partnership along the way.
Permiso recognized early that as humans, applications, service accounts, and AI agents increasingly work together, identity would become the foundation of enterprise security. They built the platform to secure that future.
Congrats to Jason, Paul, Ian, Phani, the entire Permiso team and everyone at Okta. Excited for what you will do together!
Will McCarthy retweeted
New on Altimeter's Altitude Series: @baseten CEO @tuhinone Srivastava sits down with Apoorv Agrawal (@apoorv03) to discuss the future of AI infrastructure, inference, and open-source models.
"Three-month-old intelligence at 20% of the cost."
Tuhin explains why a growing share of AI inference is shifting to open-source and custom models and what that means for builders.
Key highlights:
• How Baseten evolved from a 2019 startup into the inference platform powering some of the fastest-growing AI companies
• Lessons learned scaling a company, team, and culture in one of the fastest-moving technology markets ever
• Why every AI company needs a compute strategy—and when it makes sense to move beyond closed-source APIs
• Where we think AI infrastructure is headed and how we believe founders should position themselves for what's next
Thrilled to double down on our partnership with @baseten
@tuhinone is one of the clearest thinkers I know on AI infrastructure. He sees a cross section of how AI is actually being used across the leading AI natives, and his job is making them fast, reliable, and cheap at scale.
We discuss why inference is becoming one of the biggest markets in software, what happens as open-source models converge with frontier, and a peek into future AI workloads!
Enjoy my conversation with Tuhin:
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Will McCarthy retweeted
If Silicon Valley is @AltimeterCap HQ, our Boston team is the beating 💙 of the org - the too often unsung heroes that keep the train on the tracks. (They are also the WAY more fun part of the team.) Our summer soirée always the best. Thanks @altcapcfo for hosting!
Small team. Big ambition.
Every summer, we take a brief moment to celebrate the people behind Altimeter and everything we've worked hard to build together. It's a reminder that great investing starts with a highly motivated team, exceptional relationships, and a shared belief in excellence in all we do.
We have so much to be grateful for this summer and the best is yet to come!
(Pong champions not pictured!)
Will McCarthy retweeted
Altimeter Founder & CEO Brad Gerstner (@altcap) on the launch and success of @TrumpAccounts. A thread below 🧵
Will McCarthy retweeted
The Trump Accounts app is now available to all eligible American families. You can now activate a Trump Account for a child ahead of the official launch on July 4, 2026.
Trump Accounts help children build long-term financial security from an early age.
Here’s what you need to know:
✔️All U.S. children under 18 with a valid Social Security Number are eligible to establish a Trump Account.
✔️Eligible children born in years 2025 through 2028 receive an initial $1,000 contribution from the U.S. Treasury
✔️Family, friends, and employers, collectively, can contribute up to $5,000 annually.
✔️Built for long-term investing.
Will McCarthy retweeted
Introducing: First Pass!
Altimeter's new video series breaking down the latest trends in AI, hosted by myself and @palak_go
AI evolves so quickly. We wanted to create a series of short (~10 minute) videos taking a First Pass on the latest trends
First up: @simon_mo_ on GLM5.2
Will McCarthy retweeted
We have the fastest GLM-5.2 deployment on the market: >280 tok/s and <0.8s ttft, according to Artificial Analysis. This same performance carries across all post-trained variants.
These aren’t vanity metrics. Optimizations like these save our customers tens of millions of dollars per year.
We closed our Series F today at a $13B valuation.
Our inference business grew 20x in the last year. I want to explain why:
The growth comes from a shift I think is permanent: companies want to own their intelligence layer. Instead of relying exclusively on closed models, teams are post-training open models for their specific use cases. Customers like Abridge, Cursor, Decagon, Harvey, HubSpot, Lovable, Notion, OpenEvidence, and Parallel are building this way.
But post-training is still more of an art than a science. That’s why we’ve been working hands-on with customers to build specialized models that match or exceed closed models on the tasks they care about. We provide not just the weights, but also the training recipes and tooling so that they're in charge of the continual learning process.
I think more companies, both AI-natives and enterprises, will own their intelligence layer. And I’m excited to help build that future.