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Stainless
What it is
Stainless generates software development kits, documentation, and MCP servers from OpenAPI specifications. Its SDK offering 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 aligned with an API. It includes AI-powered hybrid search, Markdown copying, AI-tool integration, and light and dark modes. Stainless also creates code-mode MCP servers so agents can use SDKs and documentation rather than many endpoint schemas; the MCP page names Claude Code and Cursor as clients. The Free plan costs nothing and allows up to five generators, five seats, and 25 endpoints, plus 100 preview builds per month and a daily rate limit of 25. Email support is listed for that plan. A GitHub account is required for authentication and generated staging repositories. Exceeding Free Plan terms triggers automatic enrollment in a 30-day paid-plan trial. Code generation cannot be hosted on-premise, though generated SDKs can reside in a private GitHub repository.
For and against
For
- Generates SDKs in several languages
- Keeps API and documentation synchronized
- Provides code-mode MCP servers
- Free plan includes five generators
- Includes email support on Free
Against
- Free plan limited to 25 endpoints
- Daily rate limit is 25
- GitHub account required
- Code generation cannot run on-premise
The verdict
Stainless brings SDK, documentation, and MCP generation together around OpenAPI specifications. The Free plan covers small projects, while endpoint, rate, hosting, and GitHub requirements matter for larger or more controlled deployments.
Who it suits
It suits teams turning OpenAPI specifications into SDKs, synchronized documentation, or MCP servers. Developers using GitHub and named MCP clients are specifically supported.
Plans and prices
Free
Up to 5 generators · 5 seats · ≤25 endpoints incl. · 100 preview builds/mo free
Read 4 Oct 2026 · stainless.com
On the record
- Company status
- Stainless says it is joining Anthropic.stainless.com · read 4 Oct 2026
- Docs features
- The Docs Platform advertises AI-powered hybrid search, Markdown copying, AI-tool integration, and light and dark modes.stainless.com · read 4 Oct 2026
- Docs integrations
- Stainless lists ReadMe, Mintlify, Redocly, bump.sh, GitBook, and Docusaurus as documentation providers that support its SDK code snippets.stainless.com · read 4 Oct 2026
- Docs platform
- The Docs Platform keeps REST API, SDK, and narrative documentation in sync with the API and is built on Astro.stainless.com · read 4 Oct 2026
- Hosting limit
- Stainless says its code generation cannot be hosted on-premise, though generated SDKs can be hosted in a private GitHub repository.stainless.com · read 4 Oct 2026
- MCP clients
- The MCP product page names Claude Code and Cursor as tools where agents can use its generated MCP servers.stainless.com · read 4 Oct 2026
- MCP servers
- Stainless generates code-mode MCP servers from OpenAPI specs so agents can use SDKs and documentation instead of many endpoint schemas.stainless.com · read 4 Oct 2026
- SDK features
- Generated SDKs include rich types, auto-pagination, and retries out of the box.stainless.com · read 4 Oct 2026
- SDK languages
- Its SDK product lists TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C#, and PHP.stainless.com · read 4 Oct 2026
- Security
- Stainless says Business and Enterprise customers can request its SOC 2 compliance report.stainless.com · read 4 Oct 2026
- Source control
- Stainless requires users to have a GitHub account for authentication and access to generated staging repositories.stainless.com · read 4 Oct 2026
- Support
- The pricing page lists email support for the Free plan.stainless.com · read 4 Oct 2026
- Trial
- When users exceed the Free Plan terms, they are automatically enrolled in a 30-day free trial of a paid plan.stainless.com · read 4 Oct 2026
- What it does
- Stainless generates SDKs, documentation, and MCP servers from an OpenAPI specification.stainless.com · read 4 Oct 2026
