Y Combinator Summer 2025 (S25) Companies

Lark provides AI-powered testing infrastructure for engineering teams that can test UIs, APIs, SDKs, and async workflows through natural language tests. The platform integrates with CI/CD pipelines like GitHub Actions and GitLab CI, and alerts teams via Slack, email, or PagerDuty when tests fail.

1 investor

Lilac provides GPU compute infrastructure for startups, offering dedicated GPU VMs, bare-metal nodes, and private clusters with flexible capacity management options. The platform serves AI and machine learning workloads through serverless APIs, monthly subscriptions, and batch processing services.

4 investors

Liva AI collects specialized training data for audio and video models used by AI research labs, addressing gaps in publicly available datasets. The company serves machine learning teams developing speech and video recognition systems.

1 investor

llm-stats.com provides open, reproducible evaluation and benchmarking infrastructure for large language models and AI systems. The platform aggregates 200+ benchmarks and enables performance comparisons across frontier AI models to support informed decision-making by researchers, enterprises, and model developers.

1 investor

Locata builds software for primary care clinics to manage patient referrals and care coordination using AI, reducing administrative burden and improving care continuity. The platform helps clinics track patient journeys across the healthcare system and close gaps in care.

1 investor

Lotas develops an AI coding assistant embedded in RStudio that helps R-language data scientists and statisticians read, write, and modify code with contextual awareness of their codebase and environment.

1 investor

Luminal provides AI model compilation and inference optimization software that compiles models into optimized native code for GPUs and ASICs, delivering 2-3x faster inference performance compared to traditional runtime inference engines.

2 investors

Magnetic provides software that automatically converts scanned client tax documents—including handwritten notes, spreadsheets, and multi-state forms—into tax software entries, reducing manual data entry work for accounting firms. The platform helps CPA and tax preparation firms manage workload during tax season by processing client returns more efficiently.

3 investors

Magnitude is an AI coding agent optimized for open-source language models like GLM, Kimi, and DeepSeek, designed to generate and execute code with improved reliability and efficiency. The platform serves software developers and teams looking to build with open weights models at lower cost than frontier API pricing.

1 investor

MangoDesk provides reinforcement learning environments designed for training AI systems on real-world business tasks and workflows.

1 investor

Manufact provides a platform and open-source SDK for developers to build, test, and deploy MCP (Model Context Protocol) applications and servers for AI agents and chat interfaces like ChatGPT and Claude. The platform includes hosting, debugging tools, analytics, and publishing checks to help teams get their MCP apps to marketplace stores.

2 investors

Maximal provides custom machine learning models for freight and logistics operations, enabling fleet operators to optimize load planning and route assignment in real-time against their specific network constraints and processes.

1 investor

Meteor is an agentic browser that combines traditional browsing functionality with intelligent task automation to execute actions on behalf of users. The product targets users seeking personal assistant-like automation capabilities within a browser environment.

2 investors

Metis builds a post-training and continual-learning layer for enterprise agents, enabling autonomous systems to operate reliably on real tools and workflows. Their product Insight uses first-party data to train agents through reinforcement learning, allowing them to improve over time while remaining observable and safe.

3 investors

Mimos provides a unified platform for plaintiff-side law firms that manages lead generation channels (Google Ads, Local Services Ads, Google Business Profile) and intake processes (CRM, lead follow-up, attribution) in a single system. The platform connects marketing acquisition with case intake and conversion to optimize spending on channels that produce signed cases.

1 investor

Minimal AI provides AI agents for e-commerce customer support automation, capable of resolving up to 90% of support tickets across multiple channels without requiring hiring. The platform integrates with existing helpdesk systems and allows non-technical users to train AI on their business processes and workflows.

2 investors

Modelence is an AI-powered app builder that generates production-ready, full-stack web applications from natural language prompts, including authentication, database, and deployment. It serves developers and non-technical builders who want to create and deploy web applications without writing code.

2 investors

Monarcha provides AI-powered geospatial intelligence software that automatically georeferences scanned maps, extracts structured data from geological documents like drill logs and assay records, and digitizes map features into vector layers. The platform serves mining companies, government agencies, and engineering firms processing geospatial data at scale.

2 investors

Monte builds post-training and continual learning infrastructure that transforms general AI models into specialized agents adapted to specific organizational workflows. The platform captures training signals from real work, measures performance against actual constraints, and enables reinforcement learning so models improve continuously from experience.

1 investor

Motives conducts AI-moderated video interviews with real people to gather consumer insights for insights teams. The platform automates recruitment and analysis of qualitative research data.

4 investors

Munify is a blockchain-powered financial platform enabling individuals and businesses to manage multiple currencies, send money instantly globally, and access stablecoin-backed virtual cards without traditional banking infrastructure. The platform serves the MENA region as an embedded finance solution for cross-border money movement and fintech operations.

6 investors

Nautilus provides a software platform for car wash operators that handles sales processing, customer engagement automation, and analytics without taking commission on revenue. The platform is designed to modernize car wash operations and improve member retention.

2 investors

Nexa develops implantable microchips and herd management software for farmers to monitor cattle health and detect disease early. The platform combines subcutaneous sensors with a mobile/web interface to provide real-time health insights and breeding optimization for dairy and cattle operations.

1 investor

Nixo is a platform for forward deployed engineers (FDEs) that consolidates customer context, code intelligence, and workload visibility in one place. It automates customer intake, prevents duplicate work, and integrates with tools like Slack, GitHub, Linear, and CRMs to streamline FDE operations from discovery to deployment.

1 investor