なぜNvidiaはオープンモデルを構築するのか：ブライアン・カタンザロに聞く

One of the big stories of 2025 for me was how Nvidia massively stepped up their open model program — more releases, higher quality models, joining a small handful of companies releasing datasets, etc. In this interview, I sat down with one of the 3 VP’s leading the effort of 500+ technical staff, Bryan Catanzaro, to discuss:

Their very impressive Nemotron 3 Nano model released in Dec. 2025, and the bigger Super and Ultra variants coming soon,

Why Nvidia’s business clearly benefits from them building open models,

How the Nemotron team culture was crafted in pursuit of better models,

Megatron-LM and the current state of open-source training software,

Career reflections and paths into AI research,

And other topics.

The biggest takeaway I had from this interview is how Nvidia understands their unique roll as a company that and both build and directly capture the value they get from building open language models, giving them a uniquely sustainable advantage.

Bryan has a beautiful analogy for open models this early in AI’s development, and how they are a process of creating “potential energy” for AI’s future applications.

I hope you enjoy it!

Share

Guest: Bryan Catanzaro, VP Applied Deep Learning Research (ADLR), NVIDIA. X: @ctnzr, LinkedIn, Google Scholar.

Listen on Apple Podcasts, Spotify, YouTube, and where ever you get your podcasts. For other Interconnects interviews, go here.

Nemotron Model Timeline

2019–2022 — Foundational Work

Megatron-LM (model parallelism framework that has become very popular again recently; alternatives: DeepSpeed, PyTorch FSDP).

NeMo Framework (NVIDIA’s end-to-end LLM stack: training recipes, data pipelines, evaluation, deployment).

Nov 2023 — Nemotron-3 8B: Enterprise-ready NeMo models. Models: base, chat-sft, chat-rlhf, collection. Blog.

Feb 2024 — Nemotron-4 15B: Multilingual LLM trained to 8T tokens. Paper.

Jun 2024 — Nemotron-4 340B: Major open release detailing their synthetic data pipeline. Paper, blog. Models: Instruct, Reward.

Jul–Sep 2024 — Minitron / Nemotron-Mini: First of their pruned models, pruned from 15B. Minitron-4B (base model), Nemotron-Mini-4B-Instruct. Paper, code.

Oct 2024 — Llama-3.1-Nemotron-70B: Strong post-training on Llama 3.1 70B. Model, collection. Key dataset — HelpSteer2, paper.

Mar–Jun 2025 — Nemotron-H: First hybrid Mamba-Transformer models for inference efficiency. Paper, research page, blog. Models: 8B, 47B, 4B-128K.

May 2025 — Llama-Nemotron: Efficient reasoning models built ontop of Llama (still!). Paper.

Sep 2025 — Nemotron Nano 2: 9B hybrid for reasoning, continuing to improve in performance. 12B base on 20T tokens (FP8 training) pruned to 9B for post-training. Report, V2 collection.

Nov 2025 — Nemotron Nano V2 VL: 12B VLM. Report.

Dec 2025 — Nemotron 3: Nano/Super/Ultra family, hybrid MoE, up to 1M context. Super/Ultra H1 2026.

Nano: 25T tokens, 31.6B total / ~3.2B active, releases recipes + code + datasets. Papers: White Paper, Technical Report. Models: Nano-30B-BF16, Base, FP8.

Nemotron’s Recent Datasets

NVIDIA began releasing substantially more data in 2025, including pretraining datasets — making them one of few organizations releasing high-quality pretraining data at scale (which comes with non-negligible legal risk).

Pretraining Data

Collection — CC-v2, CC-v2.1, CC-Code-v1, Code-v2, Specialized-v1, CC-Math-v1. Math paper: arXiv:2508.15096.

Post-Training Data

Core post-training dumps (SFT/RL blends):

Llama Nemotron Post-Training v1.1 (Apr 2025)

Nemotron Post-Training v1 (Jul 2025)

Nemotron Post-Training v2 (Aug 2025)

2025 reasoning/code SFT corpora:

OpenMathReasoning (Apr 2025)

OpenCodeReasoning (Apr 2025), OpenCodeReasoning-2 (May 2025)

AceReason-1.1-SFT (Jun 2025)

Nemotron-Math-HumanReasoning (Jun 2025), Nemotron-PrismMath (Apr 2025)

NeMo Gym RLVR datasets: Collection

Nemotron v3 post-training (Dec 2025): Collection

HelpSteer (human feedback/preference):

HelpSteer (Nov 2023)

HelpSteer2 (Jun 2024)

HelpSteer3 (Mar 2025)

And others, not linked here.

Chapters

00:00:00 Intro & Why NVIDIA Releases Open Models

00:05:17 Nemotron’s two jobs: systems R&D + ecosystem support

00:15:23 Releasing datasets, not just models

00:22:25 Organizing 500+ people with “invitation, not control”

0:37:29 Scaling Nemotron & The Evolution of Megatron

00:48:26 Career Reflections: From SVMs to DLSS

00:54:12 Lessons from the Baidu Silicon Valley AI Lab

00:57:25 Building an Applied Research Lab with Jensen Huang

01:00:44 Advice for Researchers & Predictions for 2026

Transcript

00:00:06 Nathan Lambert: Okay. Hey, Bryan. I’m very excited to talk about Nemotron. I think low-key, one of the biggest evolving stories in twenty-five of open models, outside the obvious things in China that everybody talks about, that gets a ton of attention. So th- thanks for coming on the pod.

00:00:22 Bryan Catanzaro: Oh, yeah, it’s my honor.

00:00:23 Nathan Lambert: So I wanted to start, and some of these questions are honestly fulfilling my curiosity as a fan. As like, why does NVIDIA, at a basic level, release Nemotron as open models?

00:00:39 Bryan Catanzaro: Well, we know that it’s an opportunity for NVIDIA to grow our market whenever AI grows, and we know that having access to open AI models is really important for a lot of developers and researchers that are trying to push AI forward. you know, we were really excited by efforts from some other companies around the industry to push openly developed AI forward. You know, Meta did some amazing work, obviously, with Llama and you know OpenAI released GPT OSS, which was exciting. And the Allen Institute, of course, has been, you know, really leading the charge for research, open research and, you know, also things like the Marin Project and OpenAthena. You know, like there’s, there’s a bunch of things that we’re always excited to see develop.

And, you know, as we think about where AI is gonna go, you know, NVIDIA believes that AI is a form of infrastructure. it’s.. AI is a very useful technology when it’s applied, but on its own you know, it’s kind of a foundation and infrastructure. We think that technology generally works better when there’s openness to the infrastructure so that people can build things in different ways. You know, you think about the way that the internet transformed every aspect of the world economy is pretty profound, and we’re not done yet.

But the way that, for example, retail uses the internet is different from the way that healthcare uses the internet. And the fact that you know, different sectors of the economy were able to figure out how to incorporate the internet into the beating heart of their businesses in different ways was possible because the internet was built on open technologies that, you know, allowed people to try different things. And we think AI is gonna evolve in a similar way, that organizations across every sector of the world economy are gonna find new and surprising and fun, and important things to do with AI, and they’ll be able to do that better if they have the ability to customize AI and incorporate it directly into the work that they do. and so -- and by the way, this is not to detract from any of the you know, more closed approaches to AI, you know, the APIs that we see from a number of leading labs that, you know, are just extraordinary and have amazing capabilities. We’re excited about those, too.

You know, NVIDIA loves to support AI in all of its manifestations, but we feel like right now the sort of closed approaches to deploying AI are doing pretty well but we, you know, could use some more energy in the openly developed AI ecosystem, and so that’s why we’ve been putting more effort into it this past year.

00:03:42 Nathan Lambert: Yeah. So I’m definitely gonna dig into this a lot ‘cause I have seen this. We’re sitting here recording in January twenty-six, which is in the midst of the rollout of these Nemotron three models. There’s the-- I think the Nano has released in the fall, which was probably one of the biggest splashes the org has made, and everybody’s eagerly awaiting these super and ultra-larger variants.

And it’s like how far are you, how far are you willing to push this Nemotron platform? Like, is it just depending on the users and the uptake and the ecosystem? Like, like, what is the-- is there a North Star in this? Or you hear a lot of.. if you listen to a lot of other open labs, they’re like: “We want to build open AGI,” which is like, I don’t necessarily think grounded, but there’s like a very unifying vision.

Is there something that you try to set the tone for it that goes through the organization? I mean, AI too, it’s like-

00:04:31 Bryan Catanzaro: You know, my North-

00:04:32 Nathan Lambert: .. academics is so-

00:04:34 Bryan Catanzaro: For Nemotron.

00:04:36 Nathan Lambert: Okay, go ahead.

00:04:37 Bryan Catanzaro: Oh, sorry. Go ahead.

00:04:39 Nathan Lambert: I was just, like, gonna compare to, like, AI too, where we can have such a-- like, we have a very specific vision, being so open that it’s like, I think, like, research is so needed, and there’s so little recipes to build on, like, with really credible research. So there’s, like, a research infrastructure, and then when you have something like Llama, it was, like, built on Zuckerberg’s vision, and he changed his mind, which I actually thought his vision was ex- was excellent, the way he articulated the need for open models, and it kind of faded. So it’s like, is there a way to set a vision for an org that, like, permeates every- everyone and is really compelling and exciting?

00:05:17 Bryan Catanzaro: Right. Well, we built Nemotron for two main reasons. The first is because we need to for our main product line. So what I mean by that?

Well, accelerated computing, what NVIDIA does, we build fast computers, right? But the point of building fast computers is to help people do new things. and actually every fast computer is also a slow computer. you know, the observation that it would be nice if computers were faster and could do more things isn’t new. that’s been around since the beginning of computing. So what makes accelerated computing different from standard computing is that we’re prioritizing, you know, we’re focusing, we’re deciding we’re gonna accelerate this workload. This other workload, which is like ninety-nine percent of all of the workloads, we’re gonna let somebody else do that, right?

So, like, you do not buy NVIDIA systems to do any general purpose computation. You buy them for a purpose, right? Which is these days, all about AI. But when you think about the workload, the compute workloads involved in AI there’s a, there’s a lot of diversity and there’s a lot of really important -.. parameters, hyperparameters, or algorithmic approaches that all have enormous imp- impacts on the systems that we need to build for AI.

So things like numeric precision MoE architecture, which of course, influence net-- it influences network design. you know, we’re dreaming about sparsity. We, you know, we’ve had, we’ve had sparse neural network acceleration in the GPU since Ampere. I don’t think that it’s being used enough. you know, so how do we, how do we figure out how to use that? These, these sorts of things have an enormous impact on the future of NVIDIA’s main product line, and we have to understand the answers to those questions deeply ourselves in order to know what we’re going to build.

We can’t just go to our customers and do a survey and say, “Hey “ you know, Meta, for example, since we were just talking about them, “what would you like to see in a future product line from NVIDIA?” Of course, Meta’s always trying to help us as much as they can, but there’s limits to what they can tell us because, you know a lot of the information that influences the design of these systems, it’s very expensive to derive, and so therefore, it’s, it’s very closely held. And so we need to be able to understand these questions very deeply in order to understand what kind of systems to build, in order to understand what we’re accelerating in AI and what we’re not gonna worry about. and so that’s kind of the first job for Nemotron models, is to make it possible for NVIDIA to continue to exist as a company. And I think it’s important that the community knows that because that’s the reason why NVIDIA is making the investments in Nemotron, is because we believe it’s essential for the future of our company. and so this isn’t-- and although as much, as much as it feels good to say, you know, NVIDIA believes in open openly developed AI because you know, we’re so charitable, but actually, that’s not the case. This is actually a business decision-

00:08:34 Nathan Lambert: It’s smart

00:08:34 Bryan Catanzaro: .. like, for NVIDIA, our business needs us to know about AI very deeply. And and so, you know, the amount of investment that is justified to carry on NVIDIA’s ongoing business, I think, is large. and so that’s that’s job number one for Nemotron. Now job number two for Nemotron is to support the ecosystem more broadly outside of NVIDIA. and, you know, NVIDIA has a special position in the AI landscape. of all of the big AI companies I think we’re the one that works with the most other companies. We support every company small and large, AI native company to old established enterprise.

We work with hyperscalers, we work with tiny little startups, we work with countries around the world. so we have this unique position and I think also a uni- unique responsibility and al- maybe also a unique opportunity, that whenever AI is able to grow in any sort of direction, in any capability, then you know, that’s an opportunity for us to grow our business. Obviously, it’s not automatic, right? you know, the AI market is diverse, and it’s getting more diverse, and it should be, ‘cause it’s the most important market in the history of humanity. So so we acknowledge that, and at the same time, we know that it’s in our interest to develop the AI ecosystem. The more people that are building, inventing, and deploying AI, the more opportunity that we have as a company.

So that’s job number two for Nemotron.

00:10:17 Nathan Lambert: Yeah. I really appreciate you saying it so directly ‘cause it’s like we’ve worked.. We- I launched this thing, the Adam Project, last summer, which is trying to get more investment in the US open models, and it’s like the only company that has an obvious business model for open models is something like NVIDIA, where you need to make sure that the open models and the research ecosystem plays nicely on CUDA, because then you’re gonna be able to be one-- You’re so many steps closer to research that’s happening. If not, like, if it like- There’s such an advantage to have research happen mostly on GPUs relative to AMD or anything like this, so.

00:10:49 Bryan Catanzaro: Well, you know, we are-- we’re, we’re not thinking about how to prevent competition. You know, we welcome competition. There’s lots of competition. There should be more competition in this space, but we are very self-interested in staying engaged with the community.

You know, it’s very important. You know, CUDA not many people remember this because it happened so long ago, but you know, CUDA started out with a lot of outreach from NVIDIA to the academic and industrial community saying, “Hey, we have this new way of doing computing. we’d love to see what you can do with it.” In fact, you know, I started using CUDA in 2006 when I was a grad student at Berkeley because David Kirk, who was the chief scientist of NVIDIA at the time, came over to Berkeley and said, “Hey we just released this new GPU, and it has this new programming model called CUDA. You should give it a try.” And I was-- at the time, I was working on machine learning on FPGAs, and I had been working on this one particular piece of support vector machine training on the FPGA, and I decided to take that little piece and write it in CUDA, and it took me like fifteen minutes, and then I ran it, and it was like two hundred times faster than my single-threaded CPU code, and I was like: “Whoa, that was way easier than what I was doing before. I’m just gonna go do that,” right?

So, like, my own personal involvement with CUDA and NVIDIA came about because of this outreach that NVIDIA conducted right from the beginning of CUDA. you know, of course, that led to a lot of great things for NVIDIA, including AlexNet, which was another academic project, you know, where Alex Krizhevsky and Ilya Sutskever were thinking about: “How do we train larger neural networks on more data? we’re gonna go write a bunch of GPU code that uses the GPU in a, in a kinda new and clever way, so that we can train a better image classification model.” And, you know, that had such astonishing results, it kicked off the deep learning era for the whole community. and again, not something that-.. could have been done top-down. That was a, that was a very much a result of NVIDIA supporting open development and re- research in parallel computing and artificial intelligence. And so we remember that, and we’re thinking about in twenty-six, what does it look like to help, you know, the Alex Krizhevsky of the future, who’s, who’s a grad student in a lab somewhere, invent the next technology that changes the world? It seems really difficult to do that without something like Nemotron or, or the other openly developed AI projects out there. yeah, I also wanna say in regards to this Nemotron is not trying to be the only project out there.

We’re part of the community. We love other people doing great work in openly developed AI. We learn from things that other people do and you know, so we’re, we’re trying to support the community because it’s in our interest, but we you know, we’re very happy to see other people contributing as well.

00:13:57 Nathan Lambert: Yeah, I mean, I can transition into something I wanted to ask about is like, I see multiple ways, twenty-five Nemotron mat-- in, I don’t wanna use the word maturing ‘cause I wanna ask you about how it feels in the org, but just like the output reached levels that were more noticed by the community and people building with models. And there’s a lot of ways that can happen, but one of them is like, in my niche community, I’ve been using Nemotron datasets a lot. Like we-- when we redo our post-training recipe, one of the only people we look at is like, okay, NVIDIA, Nemotron has released a lot of high-quality, openly licensed post-training data. this year, you also started releasing some pre-training data, which among AI2 got a lot of notice. Like, what is that? is that like a distinct shift within Nemotron?

Is that something that you’ve wanted to do for a while and finally just did? But it’s ‘cause it’s like-- it is just like a zero to one moment where releasing pre-training data comes with legal risk for any company, but so few people do it, where on my side of the world, it’s like pretty easy to normally say what the best pre-training dataset is, and it had, for a long time, oscillated between like Hugging Face, AI2, DCLM, and there was like literally only two or three options. So in terms of fundamental research, like I think that’s a big step from an org to support the community and take on some risk. So if you have any story you can tell and or just say like, I appreciate it, that’s, that’s all.. that’s all I got.

00:15:23 Bryan Catanzaro: Well, yeah. I mean, so I think it’d be great if more people could understand that Nemotron is not just a model, right? Like, what we’re trying to do with Nemotron is to support openly developed AI, because, again, that’s our big opportunity, right? Now, there’s a lot of organizations that are incentivized to build a model, and the model is maybe the thing that runs their business, right?

But at NVIDIA, the model is not the thing that runs our business, it’s the systems. So