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Stefano Massaroli

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@Massastrello

Co-founder and President @RadicalNumerics | Researcher @ RIKEN | AI ∩ numerics ∩ signal processing
Bunkyo-ku, Tokyo radicalnumerics.ai Joined July 2019
185 Following 1.2K Followers 181 Posts

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Stefano Massaroli Verified account @Massastrello
@RadicalNumerics has raised $50 million in Seed funding. Evolution is the longest optimization run in history: four billion years of search toward an objective no one chose. We are here to design what evolution didn’t — and the defenses to keep that power safe. Both are inseparable. With my brothers @exnx, @athmsx and @MichaelPoli6. The work of a lifetime.
Eric Nguyen Verified account @exnx Jun 15
Together with my co-founders Michael @MichaelPoli6, Stefano @Massastrello and Armin @athmsx, I am excited to announce @RadicalNumerics is emerging from stealth with a $50M seed round to build general biological intelligence.

We’re also sharing an early preview of our new model Omnii, the most powerful genome language model to date.

Omnii preview link:
radicalnumerics.ai/blog/radical-n…

At Radical Numerics, our mission is to master the code of life, and to drive the frontier of biological AI for both design and defense.

This is our dual mandate, which comes from something our own team helped make possible.

Our founding team trained Evo and Evo 2, the largest biological AI models (40B params) trained on DNA sequences. Trillions of tokens across all of life, from microbes to mammals. It’s fully open source, and created the field now known as generative genomics.

Last year, scientists used Evo to generate the world’s first complete genome from scratch using AI. Turns out it was a bacteriophage—a type of virus. It functioned in the real world, and in this case it was harmless. But for us, it was a clear turning point.

It showed that AI is no longer just analyzing biology. It is on the cusp of generating functional lifeforms. Eventually, AI will have the power to design and control life itself.

That should make all of us incredibly excited, and incredibly uneasy. (Anyone can design DNA with a new function, and have it synthesized and delivered, like something from Amazon Prime).

The same technology that will help us cure cancer is the very technology that might create the next global pandemic, or worse, allow the creation of bioweapons that can wipe out populations.

We believe these forces are inseparable. If you work on the frontier of biology, you have to build technology to safeguard it from its misuse. Existing biosecurity tools are sorely losing the arms race, relying on outdated “have I seen this exact thing before?” style algorithms.

We founded Radical Numerics to turn the tide.

And we can’t do that by training on textbooks and natural language. We must understand the language of biology from the raw physical data itself, to reason across every molecule and modality, from DNA to proteins.

The next frontier for AI goes far beyond chatbots or video generators to models that can understand and engineer life.

Today, we’re previewing Omnii, which is already far surpassing Evo 2, and will continue improving as we scale and add new modalities (training now).

1. For human health, Omnii can read and write whole genomes (more on writing later). It’s state of the art (SOTA) on detecting causal variants for disease, and can rank Alzheimer's mutations zero-shot. We’re partnering with a diagnostics company to use Omnii for early cancer detection (pancreatic and multi-cancer).

2. For defense, Omnii is SOTA at detecting AI-generated pathogens. We benchmarked existing detection tools, and they simply can’t detect the AI-generated ones (“deepfake viruses”). We’re partnering with a US national lab to pilot Omnii for detecting the next pandemic, both natural and AI-generated.

We have a data center full of Blackwells in construction now to build the most powerful biological AI models ever. This mission takes a new kind of AI lab that can actually scale on physical, biological data: new alignment research (mid/post training), scaling long context, building out mech interp teams to dissect what these models learn, new architectures and systems designs, all from the ground up.

Our team is made up of AI researchers and scientists from top labs and institutions (e.g. Stanford, MIT, Google DeepMind), but more importantly, we all share the belief that this is the most important challenge of our lifetime. If you feel similarly, we are hiring. We aim to bring the brightest minds in AI and science together to save lives.

Thanks to our partners on this journey, led by Emergence Capital @emergencecap, with Obvious Ventures @obviousvc, Triatomic @TriatomicCap
, and Patrick Collison @patrickc. Our advisors include Eric Horvitz @erichorvitz, CSO of Microsoft, Chris Re @HazyResearch of Stanford, George Church @geochurch of Harvard, and Andrew Weber @AndyWeberNCB, former Assistant Secretary of Defense for Nuclear, Chemical and Biological Defense Programs.

Fortune article: fortune.com/2026/06/15/exc…

Jobs: radicalnumerics.ai/join-us
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Stefano Massaroli Verified account @Massastrello
Omnii-1 is a huge milestone for @RadicalNumerics.

Building it required advancing architectures, pre-training, post-training and inference to make new biological applications possible.

Pre-training meant tokenizing and blending continuous and discrete biological modalities. Post-training adapted that foundation to different applications.

At inference, we’re exploring algorithms for reasoning across biological modalities and allocating test-time compute across selective generation and conditioning steps.

Making these models train and run at scale meant pushing the underlying numerics and systems alongside the modeling. The frontier of biological AI runs all the way down the stack.

We have a cracked team. Really proud of what we’ve built together.
Eric Nguyen Verified account @exnx Oct 20
Introducing Omnii-1, our most powerful genome language model, and a major step toward general biological intelligence

In a world first, Omnii-1 designed the first AI-generated bacteriophages to be administered to a human patient with an antibiotic-resistant infection under compassionate use
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Stefano Massaroli Verified account @Massastrello
We are building biological intelligence.
Radical Numerics Verified account @RadicalNumerics Sep 8
1/5 We pretrained Omnii, a multimodal language model on DNA. Then, we asked it to design a cancer vaccine

In new research, we show how Omnii learned to turn a tumor DNA sequence into a personalized mRNA vaccine design.

Read more here: radicalnumerics.ai/blog/omnii-can…
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Stefano Massaroli Verified account @Massastrello
For a single toxin there are more working disguises than atoms in the universe -- sequences that kill the same way but match nothing on record. You can't screen a list against infinity; bio-defense has to understand function, not compare strings.

That's exactly what Omnii does.
Radical Numerics Verified account @RadicalNumerics Jun 17
1/ Leaders of OpenAI, Anthropic, & GDM signed a letter urging Congress to mandate DNA synthesis screening.
But chatbots & agents can't read DNA.

So we built Omnii to defend against natural & AI-designed pathogens.

Blog: radicalnumerics.ai/blog/omnii-def…
Letter: screendna.org
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Stefano Massaroli Verified account @Massastrello
Really proud of the progress we’re making at @RadicalNumerics.

AI has made incredible strides in the world of bits. But science lives in the world of atoms — messy, complex, and grounded in physical reality.

Bridging that gap requires a fundamentally different approach to models, data, and systems.

That’s the direction we’re pushing as a team, and it’s exciting to see it come together.

We’re growing fast — if you want to work on some of the hardest and most meaningful problems in AI, we’d love to talk.
Michael Poli Verified account @MichaelPoli6 Mar 18
We're growing rapidly at @RadicalNumerics and scaling our core teams. Join us in building the next generation of scientific world models.

We're hiring across a few roles, each with significant ownership and cross-functional scope:

- Member of Technical Staff, Post-Training
- Member of Technical Staff, Infrastructure and Training Systems
- Member of Technical Staff, Pretraining Science
- Member of Technical Staff, AI Bio
- Member of Technical Staff, Biosecurity

Our technology brings together numerics, systems engineering, and architecture design to tackle large-scale pretraining on scientific data. Our blogs (see below) give a flavor of the work.

We believe that advancing capabilities must go hand-in-hand with advancing safety and biosecurity. The same systems that design biology must also help defend against it.

Ping me or others in the team if you'd like to learn more.

job-boards.greenhouse.io/radicalnumerics
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