oapi-codegen vs Stainless
oapi-codegen
github.com
Stainless
stainless.comSide by side
| Figure | oapi-codegen | Stainless |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | — | Yes |
| macOS | — | Yes |
| Linux | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · API Generation Software | 7.5 (#12) | 7.5 (#14) |
| Spec score · Code Generators | 7.5 (#24) | 7.4 (#25) |
| Security | The project links to an organizational security policy and says it may make breaking changes if needed to respond to a security vulnerability. | Stainless says Business and Enterprise customers can request its SOC 2 compliance report. |
| Support | The maintainers describe support as best-efforts because they work on the project during off hours from their jobs. | The pricing page lists email support for the Free plan. |
Plans
In their own words
oapi-codegen
oapi-codegen has no write-up on Specifiction yet; its figures are above.
Stainless
Stainless generates SDKs, documentation and MCP servers from OpenAPI specifications. Its SDK product lists TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C# and PHP, with rich types, automatic pagination and retries included. The Docs Platform, built on Astro, keeps REST API, SDK and narrative documentation in sync with an API. Its listed features include AI-powered hybrid search, Markdown copying, AI-tool integration, and light and dark modes. Stainless also generates code-mode MCP servers so agents can work with SDKs and documentation rather than many endpoint schemas; the MCP product page names Claude Code and Cursor as clients. The Free plan costs nothing and allows up to five generators, five seats and 25 endpoints, with 100 preview builds per month and a rate limit of 25 per day. Email support is listed for Free. Users need a GitHub account for authentication and access to generated staging repositories. Exceeding Free plan terms triggers automatic enrollment in a 30-day free trial of a paid plan. Code generation cannot be hosted on-premise, although generated SDKs can be hosted in a private GitHub repository.