# Handshake AI

Human experts, training data, and environments for frontier models.

- Website: https://joinhandshake.com/ai/
- Category: RL startup, Data seller
- Type: Expert data & environments
- Capabilities: Expert data, Evaluation, Enterprise
- Reviewed: 2026-09-09

## Overview

Handshake AI connects model developers with domain experts and builds data, evaluations, and RL environments. Its research includes Gandalf the Grader, a verifier for tasks in banking tools.

## Products & services

- Expert-led data production and evaluation.
- Environment and verifier research for professional workflows.

## Sources & references

- [Handshake AI](https://joinhandshake.com/ai/)
- [Gandalf the Grader](https://joinhandshake.com/research/ai/gandalf-the-grader/)
- [Handshake acquires Cleanlab](https://joinhandshake.com/blog/our-team/handshake-acquires-cleanlab/)