YC Winter 2026 B2B Startups

/dev/fast is the AI-native code forge

The AI-native platform for next-generation protein characterization.

UI building blocks for the agentic internet

The Forward-Deployed AI Research Engineer

The control plane for AI agents.

Evals for frontier research agents

Your software should build itself.

Enterprise post-training, monitoring, and continual learning platform

Claude code for Mechanical Engineers

The AI operating system for the built world

Everything on anyone.

AI-native workspace for AEC

Full-Stack AI Accounting

Detect what AI can automate for your team

Frontier AI Defenses for Social Engineering Attacks

Dynamically pricing the whole economy.

Turn gatherings into lasting relationships.

AI teammates for logistics

The tiny computer built for voice AI.

Global upload acceleration for 1GB-100TB files.

Scaling formal verification to accelerate scientific discovery

Adversarial AI that breaks your AI

Self-tuning file search for AI agents

Agentic video editor

Revenue Agents for GTM teams

Realtime AI for Sales Calls

AI Cost Management: Track and attribute AI spend across every provider

Distilling Proprietary Intelligence

The AIOps Agent for ML Teams

AI Revenue Engine for the Equipment Industry

AI automations that implement themselves

LLM context compression for better accuracy

AI models that learn from experience

AI operating system for mega-scale satellite networks.

AI production engineer for regulated industries

The AI sales engine for CPG brands

Protect, monitor and defend your Internet presence

The Fastest Multimodal Inference OS

Infrastructure for identity and fraud.

AI Document Workflows for Enterprises

Open-source Agentic Development Environment

AI powered reconciliation for high-volume payments companies

Interpretability and reasoning infra for foundation models.

AI Agents for Government Affairs

RL environments for robotics companies

An AI-first CRM built for Startups

AI agents for corporate accounting teams

Elite AI law firm for high growth companies

Operational Superintelligence for Global Logistics

AI SRE agent that triages, coordinates, and fixes production incidents

We automate the inventory process in insurance

Automate enterprise workflows through chat

FDE as a platform for rebuilding critical operations in software.

Fast and Safe OpenClaw on the cloud

AI Agents That Run Hotel Operations.

Quantitative research for autonomous e-commerce growth

The AI-Native Immigration Law Firm

AI for Corporate Security Cameras

AI that automatically improves products from user behavior

Turning everyday words and actions into usable training data.

Digital Twins of humans

AI Video Production for Professionals

Payments Infrastructure for Conversational Agents

AI DevOps Engineer

The AI data analyst for consumer brands

Agentic Management Service for Care Organizations

Harness Engineering Infrastructure that developers love.

Global AI-native law firm handling legal work with same-day turnaround

AI to fight financial crime

The AI Data Warehouse For Financial Firms

Plan mode for complex features

Agentic Payments for APIs

Intelligence for cultural institutions

AI Infra for real-time vision applications

Take command of the AI your company already runs on.

AI-powered automation for internal audit workflows

Security builds trust. Strengthen both, all on one platform.

AI Licensing Agent for Regulated Industries

The AI-native Recruiting OS

The Networking Layer of AI

AI agents that automate customer success

Simulation environments to train & evaluate long-horizon AI agents

Building secure polymorphic apps

Real time intelligence for law enforcement & security teams.

We help private equity teams find acquisition targets faster

Use Claude Code at 47% less cost in one line of installation.

Automate any UI task with natural language

AI-native, hardware procurement marketplace

Train, eval and build autonomous agents

Claude Code for Mechanical Engineers

Intelligence for Automotive Operations

Agent Platform for Life Sciences

AI agents that grow revenue for home services businesses

Reasoning and verification infra for AI

Fastest inference anywhere: open models on-prem, hosted or on-device

Guardrails to validate your agent's actions before they execute

Multilingual voice agents that outperform humans

Datadog for Agent Reliability

The World's Largest Video Library

Media infra for consumer apps

iMessage revenue channel for DTC brands that brings customers back

Agentic Whatsapp

Marketing suite for the agentic web

Notion for AI chats

Make everyone on your team an engineer

Financial infrastructure for the agent economy

Agentic AI for intellectual property

Infrastructure for Autonomous Science

Real-time interaction models for voice agents

AI Employees for Startups, Built on OpenClaw

Evals, RL environments and training data for creative tasks

AI EMR for medspas & wellness clinics

AI-native transformation for operations-heavy companies

Compression middleware that improves LLM outputs

Research lab solving non-verifiable work

Work with agents that already know you

AI agents that automate B2B software implementation

Insurance risk layer for physical AI

A premier AI-native law firm & legal operating system for Startups.

AI Recruiting Coordinator for Executive Search

The OS for data quality across any stack

AI operating system for advertising

Custom silicon for power electronics

Real-world place intelligence for AI apps and agents

AI operator for medlegal cases

AI coworker for video editors to ship more video faster

Turning all software into agent-first APIs

The decision-support layer for aviation ops teams to know what to do…