Stainless is an AI-driven SDK generation platform that automates the creation of fully customizable SDKs from OpenAPI specifications across multiple programming languages.

Stainless offers an SDK generator that creates hand-crafted quality SDKs with a Free plan including one local SDK up to 50 endpoints. Scale-up plan costs $250/month per SDK with 50 endpoint limit, and Business plan at $800/month per SDK allows up to 200 endpoints. SDK testing and iteration within Stainless staging environment is free. In May 2026, Stainless announced joining Anthropic and winding down hosted products.
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