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| Field | Stainless |
|---|---|
| Categories | |
| HQ | New York, New York, United States |
| Founded | 2022 |
| Latest valuation | $150M |
| Annual Recurring Revenue (ARR) | ~$1M Annual Recurring Revenue (ARR) at time of Series A (December 2024) |
| Funding to date | $28.5M |
| Headcount | — |
| Profitability | Reported near-profitable at Series A (December 2024) |
| Status | acquired |
| Pricing tier | Freemium with paid tiers ranging from approximately $250/month to $30,000/year; custom enterprise plans (legacy pricing, products being wound down post-acquisition) |
| Description | Stainless is a New York-based developer-tools company that uses an artificial-intelligence-powered compiler to automatically generate software development kits (SDKs), documentation, command-line interfaces (CLIs), Terraform providers, and Model Context Protocol (MCP) servers from a customer's OpenAPI specification. Founded in 2022 by former Stripe engineer Alex Rattray, the company powers official client libraries for major AI platforms including OpenAI, Anthropic, Google, Meta's Llama Stack, and Cloudflare. In May 2026, Stainless announced it was being acquired by Anthropic in a deal reported to be worth more than $300 million, and began winding down its hosted products for external customers. |