Y Combinator Winter 2026 (W26) Companies

Maven provides a payments layer that integrates voice AI agents with payment processing, allowing agents to collect card payments via voice or keypad without card data touching the customer's servers. The platform is designed for businesses that conduct phone-based transactions, including restaurants, home services, commerce, and debt collection.

2 investors

An AI assistant that monitors financial deals, relationships, and market activity for investment and sales professionals, automatically alerting users to opportunities, tracking process status, and generating communications and meeting materials while maintaining compliance with financial regulations.

1 investor

Mendral is an AI DevOps platform that automates manual DevOps work for engineering teams through three always-on agents for security, reliability, and performance, plus custom automations. It installs as a GitHub App and autonomously diagnoses and fixes CI/CD issues, dependency vulnerabilities, and performance bottlenecks.

2 investors

Menza is an AI-powered operations platform for ecommerce and DTC brands that automates business workflows across advertising, inventory, customer service, and data analysis. It integrates with existing tools like Google Ads, Klaviyo, and inventory systems to monitor performance, flag issues, and execute business actions automatically.

2 investors

Milliray develops millimeter-wave radar systems designed to detect, track, and classify small unmanned aircraft systems that conventional radar misses. The company serves airports, critical infrastructure operators, defense agencies, and VIP protection teams across defense and counter-UAS applications.

1 investor

Sonarly analyzes alerts and system data from monitoring platforms like Sentry, Datadog, and Grafana to identify root causes and either generate pull requests with fixes or suggest alerting rule updates, serving software engineering teams seeking to reduce false positives and production issues.

1 investor

MochaCare provides operations management software for home care agencies, helping them handle scheduling, staffing, and administrative tasks while improving service reliability for clients and caregivers.

1 investor

Moda analyzes production agent logs to identify failure points and root causes, then automatically generates and validates improvements such as prompt changes, tool updates, and workflow edits. The platform helps teams diagnose agent failures and test fixes against historical traces before deployment.

1 investor

Moritz is an AI-native law firm that combines senior lawyers with custom software to deliver legal work for technology companies across the EU, US, and Australia, using fixed fees and rapid turnaround rather than hourly billing.

2 investors

MouseCat provides agentic AI infrastructure that automates fraud investigations and risk operations within customer cloud environments. The platform enables enterprises to scale investigation quality across all transactions while retaining full data control and ownership.

2 investors

NDEA develops artificial general intelligence technology and benchmarks. The company is founded by the creator of Keras and a co-founder of Zapier.

3 investors

o11 builds AI agents integrated into enterprise applications. The company serves enterprises looking to embed AI capabilities within their existing software systems.

2 investors

OctaPulse provides AI vision software that automates quality control tasks in fish hatcheries, including broodstock phenotyping and deformity detection, reducing inspection time from several minutes to under 30 seconds per fish. The platform targets vertically integrated finfish farms seeking to standardize production workflows and reduce manual labor costs in aquaculture operations.

1 investor

One Robot builds simulation environments with world models that enable robotics teams to train manipulation policies faster by learning physics and visuals from real robot experience, reducing reliance on physical hardware during development.

1 investor

Opalite builds language interpretation technology for healthcare, enabling real-time communication between physicians and patients across language barriers. The platform serves clinicians and care teams to improve patient safety and diagnostic accuracy.

2 investors

OpenSpec is a lightweight, spec-driven framework for planning and organizing requirements in codebases, designed to work with AI coding agents like Claude Code, Cursor, and GitHub Copilot. It stores specifications alongside code to provide persistent context for development teams and enable reviewers to understand requirement changes without reading code.

1 investor

Origami Robotics develops hardware components, specifically gearboxes, to improve general-purpose robotic manipulation by addressing limitations of high-ratio designs in simulation-to-reality transfer and force feedback.

2 investors

Origin generates spatial molecular maps from patient tumor samples to enable cancer biology research in native tissue context. The platform combines spatial transcriptomics, imaging, and functional perturbation assays on fresh and archived tumors, paired with AI models for drug response prediction and target discovery.

2 investors

Orthogonal provides infrastructure that enables AI agents to discover, call, and pay for third-party services and APIs through a single integration, eliminating manual setup of integrations, keys, contracts, and billing. The platform connects verified providers across data, web access, and other services, catering to developers building AI agent applications.

3 investors

Ossus builds software for managing library operations, including cataloging, circulation, and inventory management, with AI-assisted features that automate routine administrative tasks while preserving librarian judgment. The platform serves public libraries and school libraries as a complete system or as add-on agents to existing infrastructure.

1 investor

Overdrive Health provides AI-powered medical billing services that automate the revenue cycle for healthcare providers, including insurance discovery, eligibility verification, coding, claims submission, and denial management. The platform combines automated technology with human oversight to reduce administrative burden and improve billing efficiency for medical practices.

1 investor

Overshoot provides a vision model that processes live video streams and returns pixel coordinates for detected targets, operating as an inference service.

1 investor

Oximy provides a system to help enterprises move from AI procurement to measurable productivity gains through behavioral change management. The platform addresses shadow AI proliferation and pilot failures by implementing continuous cycles of understanding, acting, and quantifying AI adoption across organizations.

1 investor

Oxus is an AI-powered platform that automates repetitive audit work, transforming documentation into standardized flowcharts, control inventories, and risk mappings while executing testing workflows for internal audit teams.

1 investor