Stainless alternatives: What to use now that the SDK generator is shutting down

The acquisition of Stainless by Anthropic has prompted discussions among developer teams about the potential impact on SDK generation, emphasizing the importance of having control over their own tools. Anthropic plans to wind down hosted Stainless products, leading to concerns about vendor dependency for SDK generation, a complex process requiring precise handling of resources, retries, authentication, and error management across multiple programming languages. Alternatives to Stainless include OpenAPI Generator, Speakeasy, and Fern, each offering different levels of customization, output quality, and management. However, the open-source framework oagen is gaining attention for its ability to create custom SDK generators from OpenAPI specs, allowing teams to maintain ownership and ensure idiomatic output across languages. oagen requires more initial effort as it provides a framework rather than a turnkey solution, but it offers long-term stability and independence from vendor constraints, making it an attractive option for teams prioritizing control over their SDK generation pipeline.