The companies building it

Cursor

The AI-first code editor

YC S22

Built on VS Code, with inline editing, chat, and autonomous agents.

Stage

Series B

Raised

$173M

Last round

$105M

HQ

San Francisco, CA

Decagon

AI agents for customer support

YC

End-to-end autonomous support for consumer and fintech brands.

Stage

Series B

Raised

$100M

Last round

$65M

HQ

San Francisco, CA

Scale AI

Data foundry for AI

YC S16

Labeled training data, RLHF, and evaluation for frontier model labs and enterprises.

Stage

Growth

Raised

$1.6B

Last round

$1.0B

HQ

San Francisco, CA

Replit

AI-native collaborative coding

YC W18

Browser IDE with Replit Agent — an AI that builds, deploys, and iterates on full apps.

Stage

Series B

Raised

$222M

Last round

$97M

HQ

San Francisco, CA

Cresta

Real-time AI for the contact center

YC S17

Agent assist and coaching for sales and support teams, grounded in conversation intelligence.

Stage

Series D

Raised

$271M

Last round

$125M

HQ

San Francisco, CA

Exa

The search engine built for AI

YC S21

Neural search API (formerly Metaphor) tuned for agents and retrieval pipelines.

Stage

Series A

Raised

$22M

Last round

$17M

HQ

San Francisco, CA

Browserbase

Headless browsers for AI agents

YC S24

Managed browser infrastructure and Stagehand SDK for web-native agents.

Stage

Series B

Raised

$66M

Last round

$40M

HQ

San Francisco, CA

Baseten

The inference platform for AI-native products

YC W19

Serverless model serving, autoscaling, and Truss — an open-source packaging format.

Stage

Series C

Raised

$135M

Last round

$75M

HQ

San Francisco, CA

Humanloop

The LLM evals and prompt engineering platform

YC S20

Collaboration layer for product teams shipping with LLMs — prompts, evals, observability.

Stage

Seed

Raised

$5.5M

Last round

$5.5M

HQ

London, UK

Vercept

Agents that operate your desktop

YC S24

General-purpose computer-use agents built on frontier multimodal models.

Stage

Seed

Raised

$16M

Last round

$16M

HQ

Seattle, WA

Wordware

A notebook-native IDE for AI

YC W24

Build, deploy, and share AI agents as natural-language documents.

Stage

Seed

Raised

$30M

Last round

$30M

HQ

San Francisco, CA

Supermemory

A second brain for AI agents

YC W25

Hosted long-term memory API for LLM products — semantic recall plus knowledge graphs.

Stage

Seed

Raised

$3.0M

Last round

$3.0M

HQ

San Francisco, CA

Julius AI

ChatGPT for your data

YC W23

Natural-language data analysis, chart generation, and forecasting on spreadsheets.

Stage

Seed

Raised

$10M

Last round

$10M

HQ

San Francisco, CA

Patched

Open-source agents for code review and maintenance

YC S24

Workflow agents that triage, patch, and document code changes across repos.

Stage

Seed

Raised

$1.0M

Last round

$1.0M

HQ

Singapore

11x

AI digital workers for go-to-market

YC W24

Autonomous SDRs and field reps that prospect, message, and book meetings end-to-end.

Stage

Series B

Raised

$74M

Last round

$50M

HQ

San Francisco, CA