Choosing an SDK vendor: Speakeasy vs Fern vs Stainless vs openapi-codegen

Choosing the right SDK generator is crucial for enhancing developer experience and facilitating API integration, with options like Speakeasy, Fern, Stainless, and OpenAPI Typescript Codegen offering diverse features and capabilities. Speakeasy stands out for its comprehensive OpenAPI support, automated SDK generation, and features like pagination, OAuth 2.0, and webhook support, making it ideal for API-first teams seeking minimal manual intervention. Fern provides high customization through its domain-specific language, Fern Definition, but may result in vendor lock-in and requires dual management of OpenAPI and Fern definitions. Stainless offers polished SDKs and a clean developer experience but relies on a custom configuration format that might limit OpenAPI support. OpenAPI Typescript Codegen, while open-source and free, requires significant manual work for production-grade SDKs and lacks advanced features like OAuth and streaming support. Ultimately, the choice of SDK generator should align with the team's workflow, budget, and need for customization, with Speakeasy being a strong contender for those prioritizing seamless OpenAPI integration and automation.