Stainless is an API developer-tools company that built a platform for generating SDKs, documentation, CLIs, and MCP servers, and was acquired by Anthropic in May 2026. Stainless's Twitter Score is 6.9 out of 1000 as of October 2026, ranking #127,735 among 493,668 tracked accounts.
Stainless was founded by Alex Rattray as Stainless Software, Inc., with the company taking shape in early 2022 around the goal of simplifying how development teams produce and maintain API tooling. Its platform generated SDKs for APIs used by organizations including OpenAI, Anthropic, Meta's Llama Stack, Cloudflare, and Mux. In December 2024, the company announced a $25 million Series A led by Andreessen Horowitz, with participation from Sequoia Capital, The General Partnership, Felicis, Zapier, and MongoDB Ventures.
Stainless announced on May 18, 2026 that Anthropic was acquiring the company and bringing its team in-house. Following the transaction, Stainless said it would wind down all hosted products and stop accepting new signups, projects, and SDKs, though customers retain ownership of any SDKs generated before the wind-down and may continue to modify or extend them. Stainless's account has published 339 posts and has been mentioned by 19 accounts a total of 23 times.
Who follows Stainless on X?
The accounts that follow Stainless include 44 founders, 18 angel investors, 8 influencers and 3 VCs, among them Mario Nawfal, mikedemarais.eth, Sequoia Capital, Matt Mullenweg, Salvino and Aashima Arora.