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title: Your OpenAPI spec | Stainless
description: Your OpenAPI spec is the foudation Stainless builds on; learn how to create or upgrade your spec, use multiple specs, and more.
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Stainless uses your OpenAPI spec to generate SDKs, documentation, a CLI, and much more. An accurate and comprehensive OpenAPI spec is key to getting the most out of Stainless.

[OpenAPI requirements ](/docs/openapi/requirements/index.md)Details about the OpenAPI versions and features Stainless supports

[Create an OpenAPI spec ](/docs/openapi/create/index.md)How to create or generate an OpenAPI spec for your API

[Update your OpenAPI spec ](/docs/openapi/upgrade/index.md)Upgrade from Swagger 2.x to OpenAPI 3.x

[Use multiple OpenAPI specs ](/docs/openapi/multiple/index.md)Use multiple specs to generate a single set or multiple sets of targets

[Generate an OpenAPI repository ](/docs/openapi/generate-repo/index.md)Use Stainless to generate a Git repo for your OpenAPI spec

[Stainless OpenAPI transforms ](/docs/openapi/transforms/index.md)Change the way Stainless sees your OpenAPI spec without changing the spec itself