---
title: Use multiple OpenAPI specs with Stainless | Stainless
description: How to generate a single set of SDKs from multiple specs, or generate different sets of SDKs from different specs.
---

You have two options when dealing with multiple OpenAPI files:

## Option 1: Combine your specs into a single file

We recommend using the `redocly` CLI to combine OpenAPI files. This works well when:

- Customers commonly use multiple APIs together in a single integration
- The APIs share authentication and configuration
- You want a simpler developer experience with one unified SDK

Redocly wrote this comprehensive [blog article](https://redocly.com/blog/combining-openapis) with clear examples. If you’re using Stainless [GitHub Action](https://github.com/stainless-api/upload-openapi-spec-action) to upload your spec file, just add an extra step beforehand to run the `redocly` CLI and combine your files in a single spec file.

## Option 2: Generate separate SDKs from each OpenAPI file

Create multiple Stainless projects, one for each OpenAPI spec. This approach makes sense when:

- Your APIs serve entirely different customer bases
- Developers typically only integrate with one API at a time
- The APIs have very different authentication or versioning schemes