DEAL_OVERVIEW
Deal Terms
Date
2026-05-18
Amount
Undisclosed
Est. Multiple
N/A
Key Talent
N/A
Integration Time
N/A
Categories
API InfrastructureDeveloper Tools
Deal Multiples
No detailed multiples available
Strategic Rationale
Stainless generates the SDKs, CLIs, and MCP servers through which developers and agents reach APIs — including every official Anthropic SDK since the API launched, plus tooling used by OpenAI and Google. Rationale per Anthropic platform lead Katelyn Lesse: "agents are only as useful as what they can connect to." Terms undisclosed; press reports placed the deal above $300M.
POST_ACQUISITION_TIMELINE
No post-acquisition events tracked
KEY_PEOPLE1 TRANSITIONS
AR
Alex Rattray
Stainless Founder & CEO→Anthropic Platform engineering, Anthropic