Stainless

Acquired

New York developer tools startup that automatically generates and maintains SDKs, CLIs, and MCP servers from API specs across TypeScript, Python, Go, Java, Kotlin, Ruby, and more. Powered the official SDKs for OpenAI, Google, Meta, Anthropic, Cloudflare, and Runway. Acquired by Anthropic in May 2026 for a reported $300M+.

Founders Alex Rattray

CEO Alex Rattray

Company

Founded

2022

Headquarters

New York, United States

Financials

Total Funding

$29M

Last Valuation

$150M

Sectors

Artificial Intelligence SaaS Developer Tools Enterprise Software

www.stainless.com

Funding History

2 rounds

Acquired by Anthropic May 18, 2026

$300M

Series A Dec 15, 2024

$25M

Valuation: $150M

Andreessen Horowitz (Lead) Sequoia Capital The General Partnership Felicis Zapier MongoDB Ventures

Seed Apr 15, 2024

$4M

Sequoia Capital (Lead)

Funding data is compiled from multiple independent sources including company announcements, press coverage, and regulatory filings. While we strive for accuracy, amounts and dates may reflect reported figures at time of announcement.