Founder of @saifvc - The Safe Artificial Intelligence Fund. Former President at Y Combinator. Founder, Imagine K12. Angel Investor.

Atherton
METR is one of the most important AI safety organizations. The work they do is vital and I’m a proud supporter.
My name is Chris Painter, and I'm the President of METR (Model Evaluation and Threat Research). I know we've made a lot of new friends on the internet the last couple of days, so I thought I'd take this chance to re-up what we do and why. Our work is aimed at making sure that if AI really were autonomous, difficult to steer, and close to "going rogue," the public would find out. If evidence exists inside of an AI company that it’s close to losing control of AI, we want to make sure that information gets shared with the rest of the world, including governments and the public outside the company’s walls. This is what we've been focused on since 2022, and over the years we've worked with OpenAI, Anthropic, Google DeepMind, Meta, Amazon, and others on piloting third-party assessments and investigations of this type. We don’t have some private room where we rubber stamp things as “safe” or not. We have had a track record of publishing results on AI that don't cleanly map onto the "doomer" or "accelerationist" labels, and we put in effort to hire people with competing views on AI. We’ve been cited for having found some of the strongest evidence that AI capabilities are improving rapidly (our work measuring AI “time horizons”) while also presenting some of the strongest evidence that, at various points, AI’s capability may be overstated (some might remember our study showing that early 2025 software engineers were actually being slowed when they thought they were being sped up). METR is funded by donations. We don't accept money from frontier AI companies. They haven't paid us for our work, and we don't accept donations from them or their employees. As we’ve shared previously, multiple frontier AI companies currently provide us with free access to their models in order to perform our evaluations, research, and engineering. Our funding intentionally comes from a wide range of donors, which we’ve shared on our website. Today, when an AI company works with any third-party evaluator or external testing organization (of which there are and should be many), it's entirely voluntary. This often involves NDAs and redactions. To counterbalance this, we have a principle that when we enter into a contract with a company, we try to retain the right to tell the public the terms of the contract we signed, and characterize the nature of redactions that the company chose to make. For example, the report from our independent investigation of the OpenAI-HuggingFace incident included that information. Public disclosure is also a big part of our COI policy (linked on our website). That’s not to say our reports are adequate as oversight. We’re just one organization (among many doing great work), working in a voluntary setup, trying to get good evidence to the public and the world about AI, letting the facts fall where they may.
4
13
1,077
Geoff Ralston retweeted
My name is Chris Painter, and I'm the President of METR (Model Evaluation and Threat Research). I know we've made a lot of new friends on the internet the last couple of days, so I thought I'd take this chance to re-up what we do and why. Our work is aimed at making sure that if AI really were autonomous, difficult to steer, and close to "going rogue," the public would find out. If evidence exists inside of an AI company that it’s close to losing control of AI, we want to make sure that information gets shared with the rest of the world, including governments and the public outside the company’s walls. This is what we've been focused on since 2022, and over the years we've worked with OpenAI, Anthropic, Google DeepMind, Meta, Amazon, and others on piloting third-party assessments and investigations of this type. We don’t have some private room where we rubber stamp things as “safe” or not. We have had a track record of publishing results on AI that don't cleanly map onto the "doomer" or "accelerationist" labels, and we put in effort to hire people with competing views on AI. We’ve been cited for having found some of the strongest evidence that AI capabilities are improving rapidly (our work measuring AI “time horizons”) while also presenting some of the strongest evidence that, at various points, AI’s capability may be overstated (some might remember our study showing that early 2025 software engineers were actually being slowed when they thought they were being sped up). METR is funded by donations. We don't accept money from frontier AI companies. They haven't paid us for our work, and we don't accept donations from them or their employees. As we’ve shared previously, multiple frontier AI companies currently provide us with free access to their models in order to perform our evaluations, research, and engineering. Our funding intentionally comes from a wide range of donors, which we’ve shared on our website. Today, when an AI company works with any third-party evaluator or external testing organization (of which there are and should be many), it's entirely voluntary. This often involves NDAs and redactions. To counterbalance this, we have a principle that when we enter into a contract with a company, we try to retain the right to tell the public the terms of the contract we signed, and characterize the nature of redactions that the company chose to make. For example, the report from our independent investigation of the OpenAI-HuggingFace incident included that information. Public disclosure is also a big part of our COI policy (linked on our website). That’s not to say our reports are adequate as oversight. We’re just one organization (among many doing great work), working in a voluntary setup, trying to get good evidence to the public and the world about AI, letting the facts fall where they may.
460
431
3,634
653,360
“History Teaches Us” Is Not a Plan geoffralston.substack.com/p/…
5
1,149
FROs are one of the most innovative new forms to enter the venture world in years. This is a very cool opportunity for anyone who is interested in changing the world for the better.
We're hiring. Think: Sr partner at a venture incubator, but the outputs are Focused Research Organizations Form the thesis, find the founders, build the boards, launch the org AI resilience: bioresilience, cyber-physical systems, epistemic infrastructure, compute governance
1
2
27
1,900
Fabraix is a @SAIFVC company making us all safer by helping companies ensure that agents are aligned. Congrats to Ahmed and Ibrahim.
Introducing Nyx, the world’s frontier hacker of AI agents. On AgentHarm, Nyx achieved a 78% attack success rate - compared with 67% for GPT-5.6 Sol. Here’s more about how it works 🧵
3
1
6
1,499
Calling them anti-startup makes no sense. They apply only to companies with enormous training runs and $500M+ in revenue. Startups benefit when the powerful platforms they build on are safe and reliable.  2/2 massterlist.com/p/ai-battle-…
4
20
1,981
Massachusetts’ S.2630 contains important, commonsense safeguards for the largest frontier AI companies, including catastrophic-risk assessments and independent scrutiny. These provisions should remain in the final bill: @BarryFinegoldMA 1/2
12
1,117
I predict the age of AI will supercharge Vanta’s growth. Everyone will search for trust.
It took us two years to grow from $10 mm to $100 mm in Annual Recurring Revenue and 15 months to reach $200 mm. Nine months later, we crossed $300 mm. Vanta’s growth rate increased each of the past four quarters – compounding really is the eighth wonder of the world! “But wait,” you might be thinking. “How does a software company founded before 2022 *increase* its growth rate?” Narrative violation!
1
7
2,896
Geoff Ralston retweeted
5
7
66
9,454
Congrats to Zach and Ibrahim @FabraixHQ - one of the newest @SAIFVC companies building AI guardrails to protect us all.
Introducing Nyx, the most advanced verification engine for AI agents. AI agents fail in ways traditional software doesn't. Nyx is your own team of AI security engineers, on demand, that helps you find all the ways in which your AI agents fail. Point it at any AI agent, or multi-agent system, and it launches 1,000+ attack strategies that adapt to your system in real time - pure blackbox, no integration needed. Sign up using the link below
1
1,382
I spend a lot of time thinking about the risks of AI as it gets embedded, well, everywhere. It's nice to see a use case that seems unambiguously useful and good. Well done, Parker and the team at Rippling.
Rippling launched its AI analyst today. I'm not just the CEO - I'm also the Rippling admin for our co, and I run payroll for our ~ 5K global employees. Here are 5 specific ways Rippling AI has changed my job, and why I believe this is the future of G&A software. 🧵 1/n
4
6
70
9,825
Geoff Ralston retweeted
"You can pick areas to harden the world – defensive cybersecurity, biodefense, etc – and intentionally curate the datasets, environments, & evals you need to pull the jagged frontier in this specific direction." - @alexispcarlier of @AsymmetricCyber on an underrated opportunity!
2
6
11
4,600
No politics, no AI (except for Claude code), no AI safety. Just a silly game I built called whoopie.fun. open.substack.com/pub/geoffr…
1
4
919
We’re super excited @SAIFVC about the work @apolloresearch is doing.
Apollo is spinning out from fiscal sponsorship into a PBC. We are increasing our efforts in frontier AI safety research, evals and governance. Additionally, we are spinning up a product team to build AGI safety products starting with AI agent monitoring.
4
1,038
Congrats to @AsymmetricCyber on their launch. They are one of the very first @SAIFVC companies and we’re thrilled to be part of their journey.
In a world with abundant intelligence, AI agents will not just replace humans in existing workflows, but make new kinds of work possible; work that was previously too slow or expensive to perform at scale. In cyberdefense, automated digital forensics, i.e. deep security investigations, will become ubiquitous. Today we’re launching Asymmetric Security, the first full-stack AI Digital Forensics and Incident Response company. We're working with the worlds largest global cyber insurers, and our AI platform has already helped incident responders handle hundreds of cyber attacks. Building on this experience, we’re creating realistic training scenarios and evaluations to improve both our AI cyber-defense capabilities and those of frontier labs. Our mission is to accelerate AI cyberdefense to address the security challenges of the AGI era.
1
4
2,041
I could not be prouder of my big brother’s extraordinary 5 year journey leading to this day. It’s a terrific book about a truly influential American. Read it!
Good morning from The #WeMatter State. On this day in 2026, my Harry Reid biography is out. "The Game Changer, How Harry Reid Remade the Rules and Showed Democrats How to Fight" can be ordered here: simonandschuster.com/books/T… Candidate filing: 41 days Primary: 140 General: 287
1
9
1,717
My son @nralston14 and partner @SAIFVC just published a very cool essay on the amazing backend he built for the fund. nralston.substack.com/p/vibe…
2
9
2,195