tl;dr: we went through every AI lab in our data: model labs, robotics labs, world models, compute. we pulled the 10 still under 500 followers on X. ex-Google DeepMind. ex-Meta FAIR. the founders of Smule. a Mila PhD who worked on world models at Meta. three YC teams. none of them have raised a seed round we could find.
every entry carries the date frontrun first flagged it. follower counts are as of september 29. read the original on X.
1. Timbral AI: human-level hearing for AI
"realtime omnipresent auditory reasoning." an AI lab building frontier audio intelligence, with one mission: human-level hearing for AI.
- flagged: september 24
- followers on X: 8
- sector: Audio AI
- founders: @prernagupta and @indianmusic (co-founders of Smule and Hooked; Parag ran the music intelligence lab at Georgia Tech)
- website: timbral.ai · X: @timbralai
2. Presage Labs: world models for cloud infrastructure
"world models for cloud infrastructure." Cloud-1 learns from production AWS data and predicts incidents, costs and capacity before they happen. Google DeepMind's Mehdi Ghissassi just joined the board.
- flagged: july 23
- followers on X: 18
- sector: World Models
- founders: @benrey0302 and Arthur Chevalier
- website: presagelabs.ai · X: @presagelabs_ai
3. PerfectBit: policies for robots that do real work
"we're building policies for robots that do real work." training data that is correct by construction, checked against physics simulators, scientific databases and formal proof systems. their site says they are "deliberately quiet about the details." the account has never posted.
- flagged: september 18
- followers on X: 45
- sector: Robotics
- founders: Peter Vajda (11 years at Meta) and Seiji Yamamoto (led Core Llama teams at Meta Superintelligence Labs). YC Spring 2026.
- website: perfectbit.ai · X: @perfectbitai
4. Chariot: teaching machines to think in speech
"teaching machines to think in speech." a speech reasoning lab building audio-native models. Chariot-1 speaks English, Hindi and Hinglish, and switches between them mid-sentence like people actually do.
- flagged: august 25
- followers on X: 69
- sector: Voice AI
- founders: @parthsarthi03 (Stanford NLP, ex-Google DeepMind) and @TheBhooshan (ex-Meta FAIR)
- website: chariot.in · X: @chariot_in
5. Strand AI: spatial proteomics from H&E
"spatial proteomics from H&E." foundation models that fill in missing patient biology. their model Lattice predicts protein-marker maps from the routine slides every hospital already makes.
- flagged: july 9
- followers on X: 73
- sector: Bio AI
- founders: @moremelessyue (ex-Element AI and Microsoft Research) and Oded Falik (ex-Enable Medicine). YC W26.
- website: strandai.com · X: @strandaibio
6. EdotEnv: a quant neolab working toward RSI
"quant neolab working toward RSI." they turn financial markets into RL environments that keep getting harder, so agents can keep climbing, and sell them to frontier labs.
- flagged: august 18
- followers on X: 145
- sector: RL Environments
- founders: @RRicefan (ex-G-Research quant) and @Michaelz1914 (ex-Etched). both ETH Zurich. YC S26.
- website: edotenv.com · X: @edotenv
7. Paper Instruments: open-source frontier models for knowledge work
"open-source frontier models for knowledge work." they post-train open models (Ultramarine), ship the agent harness around them (Feather), and rebuilt office documents for agents (Paper Office).
- flagged: july 18
- followers on X: 242
- sector: Models
- founders: @bertgodel, @joeybesgen and Gavin Bains. YC X25.
- website: paperinstruments.com · X: @paperinstr
8. Action Intelligence: make intelligence act
"make intelligence act." robot foundation models trained on human experience: demonstration and guidance from people become the training signal for robots in the real world. first release is Continuo, an always-on memory layer for smart glasses.
- flagged: september 8
- followers on X: 328
- sector: Robotics
- founder: @JingkangY (PhD from NTU's MMLab). Singapore.
- website: action-intelligence.ai · X: @action_int_ai
9. World Mechanics: interpretable models of the physical world
"a frontier neolab building interpretable models of the physical world." the site says coming soon. the account went live two weeks ago.
- flagged: september 26
- followers on X: 410
- sector: World Models
- founder: @soniajoseph_ (Mila PhD, visiting researcher at Meta FAIR on world models and interpretability). San Francisco.
- website: worldmechanics.ai · X: @world_mech_ai
10. Hapta Labs: the infrastructure for robotics intelligence
"the infrastructure for robotics intelligence." a robotics research lab building the whole loop: a tactile glove that records movement, force and touch, the real-world data it captures, and the models trained on it.
- flagged: july 10
- followers on X: 447
- sector: Robotics
- founder: @Sylviaposts (AI at Carnegie Mellon). San Francisco.
- website: haptalabs.com · X: @haptalabs
that's 10
out of the 648 AI, robotics and compute companies frontrun has flagged in the last 30 days that are still under 500 followers.
want to see all of them?
read next: ex-OpenAI, xAI and DeepMind founders building in stealth · YC F26 companies not in the YC directory · stealth robotics startups
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