/Companies

Nuntius

DefunctYC S25

San Francisco, US · Founded 2025 · 2 employees · 8 known investors

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Nuntius builds tools to ensure AI models comply with specified constraints and behave reliably in commercial applications.

Founders & leadership· Y Combinator alumni (S25)

DR
Daniel RupawallaCEO2025–2025
AR
Abhijay Rana

Investors · 8

BoxGroupreportedNew York · $250K – $1M

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Metsu Capitalreported

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Susa VenturesreportedSan Francisco · $1M – $5M

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SV AngelreportedSan Francisco · $150K – $20M

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Images

Nuntius photoNuntius photo

Related companies · 7

Nuntius TherapeuticsNuntius develops programmable nanocarriers for drug delivery that can target tissues beyond the liver and utilize machine learning to optimize carrier performance. The company serves pharmaceutical and biotech organizations developing targeted therapeutics.
CartpoleCartpole develops simulation environments designed to train advanced machine learning models using reinforcement learning techniques.
StartuphubStartupHub.ai is an open data and intelligence directory covering AI-ecosystem companies, founders, and capital, accessible to both people and AI agents. It offers a free browsable database of AI startups, with paid tiers for API, MCP, and bulk-export access.
OsmosisOsmosis provides reinforcement learning infrastructure that enables AI agents to improve themselves from experience. The platform allows developers to fine-tune models on proprietary data with full ownership, addressing practical challenges in deploying and scaling AI agents across multi-step tasks.
UnifyUnify provides AI agents that handle routine business tasks across communications, sales, operations, and engineering by executing pre-built workflows or custom automation. The service serves tech-focused companies and teams looking to offload administrative and repetitive work.
Experiential LabsAn applied AI research lab that develops world models enabling agents to simulate physical environments with high-fidelity reconstruction, using technology derived from autonomous vehicle systems.
hiloophiloop provides snapshottable, forkable compute infrastructure with built-in observability for AI agents that propose, run, and verify experiments (autoresearch). It offers self-provisioning sandboxes via API, brokered secrets, and per-run tracing with token and cost tracking queryable via SQL, aimed at teams doing autoresearch, model training, and performance-critical development.

Companies working in the same space as Nuntius.

Legal entities · 1

corporate structure
Nuntius, Inc.

Frequently asked questions

What does Nuntius do?
Nuntius builds tools to ensure AI models comply with specified constraints and behave reliably in commercial applications.
Who are Nuntius's investors?
Nuntius's investors include Y Combinator, Afore Capital, BoxGroup, CRV (Charles River Ventures), Liquid Ventures, Metsu Capital, Susa Ventures, SV Angel.
Where is Nuntius headquartered?
Nuntius is headquartered in San Francisco, US.