MentionFox lists 29 AI infrastructure companies for 2025. Of them, 29 are Y Combinator companies (the newest batch here is Fall 2025, with 3).
Other years
All years (146) 2026 (60) 2024 (23)
AI infrastructure startups in 2025
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| Axial | Accelerated Physics Kernels for Computational Engineering | Fall 2025 | Y Combinator batch | Y Combinator listing | |
| hillclimb | Training Data for Recursive Self-Improvement | Fall 2025 | Y Combinator batch | Y Combinator listing | |
| SF Tensor | Infrastructure for AI labs to focus on research. | Fall 2025 | Y Combinator batch | Y Combinator listing | |
| Lilac | We sell GPUs. | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Liva AI | Building socially intelligent AI | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Llm Stats | Independent AI evaluations lab | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Luminal | Making AI run fast on any hardware. | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Magnitude | Open source inference server for local models | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| TwentyTwo | AI infrastructure for biosecurity | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Wafer | AI that makes AI fast | Summer 2025 | Y Combinator batch | Y Combinator listing | |
| Aviro | Environments for Long Horizon Work | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Besimple AI | Voice data for AI | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Cartpole | Building reinforcement learning environments | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Cua | Give every agent a cloud desktop | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Kairos | Specialized AI for Critical Industries | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| mlop | Experiment tracking for training ML models | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Paper Instruments | Open-source frontier models for knowledge work | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| ParaQuery | Managed GPU-accelerated Spark + SQL at 2x speed and half the cost | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Partcl | Design a chip in minutes | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Sureform | Real-world data and RL environments for frontier AI | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| Sygaldry Technologies | quantum-accelerated AI servers | Spring 2025 | Y Combinator batch | Y Combinator listing | |
| .Wave | Continuous inference for streaming AI models | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| AfterQuery | Applied research lab curating data solutions for foundation model… | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| Confident AI | The LLM Eval and Observability Platform for AI Quality | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| Hud | Platform for building RL environments and evals | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| Lucidic AI | Reimagining how Machines Learn | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| Mundo AI | High Quality Multilingual Training Data for AI Models | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| Stillwind | PCB component librarian | Winter 2025 | Y Combinator batch | Y Combinator listing | |
| TensorPool | Vercel For GPUs | Winter 2025 | Y Combinator batch | Y Combinator listing |
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Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.