Stainless
Stainless generates SDKs, documentation, and MCP servers from OpenAPI specifications.
What Stainless is
Stainless generates SDKs, documentation, and MCP servers from OpenAPI specifications. Its SDKs cover TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C#, and PHP, with rich types, automatic pagination, and retries included. The Docs Platform is built on Astro and keeps REST API, SDK, and narrative documentation aligned with an API. It includes AI-assisted hybrid search, Markdown copying, AI-tool integration, and light and dark modes. Stainless also creates code-mode MCP servers, allowing agents to work with SDKs and documentation rather than many separate endpoint schemas; its listed MCP clients include Claude Code and Cursor.
The Free plan costs nothing and includes up to five generators, five seats, 25 endpoints, 100 preview builds per month, and a daily rate limit of 25. It comes with email support. A GitHub account is required for authentication and access to generated staging repositories. Code generation cannot be hosted on-premise, though generated SDKs can be kept in a private GitHub repository.
Good
- Generates SDKs, documentation, and MCP servers from OpenAPI.
- SDKs include rich types, pagination, and retries.
- Free plan includes up to five generators and five seats.
- Supports multiple documentation providers for SDK snippets.
Watch out
- Requires a GitHub account for authentication and staging repositories.
- Code generation cannot be hosted on-premise.
- Free plan is limited to 25 endpoints.
Who it suits
Stainless suits teams that generate SDKs or API documentation from OpenAPI specifications, or want MCP servers for agent workflows. Its Free plan has stated generator, seat, endpoint, and preview-build limits.
Verdict
Stainless brings SDK generation, API documentation, and MCP server creation together around OpenAPI specifications. Check the Free plan limits and hosting restriction against your workflow.
Plans and prices
From Stainless's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Up to 5 generators · 5 seats · ≤25 endpoints incl. · 100 preview builds/mo free · rate limit 25/day |
The facts
Each one read from Stainless's own pages, with the date it was checked.
The company
- Company status
- Stainless says it is joining Anthropic.checked 4 Oct 2026
What it does
- Docs features
- The Docs Platform advertises AI-powered hybrid search, Markdown copying, AI-tool integration, and light and dark modes.checked 4 Oct 2026
- Docs integrations
- Stainless lists ReadMe, Mintlify, Redocly, bump.sh, GitBook, and Docusaurus as documentation providers that support its SDK code snippets.checked 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.checked 4 Oct 2026
- MCP clients
- The MCP product page names Claude Code and Cursor as tools where agents can use its generated MCP servers.checked 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.checked 4 Oct 2026
- SDK features
- Generated SDKs include rich types, auto-pagination, and retries out of the box.checked 4 Oct 2026
- SDK languages
- Its SDK product lists TypeScript, Python, Go, Java, Kotlin, Ruby, Terraform, C#, and PHP.checked 4 Oct 2026
- Security
- Stainless says Business and Enterprise customers can request its SOC 2 compliance report.checked 4 Oct 2026
- Source control
- Stainless requires users to have a GitHub account for authentication and access to generated staging repositories.checked 4 Oct 2026
- Support
- The pricing page lists email support for the Free plan.checked 4 Oct 2026
- What it does
- Stainless generates SDKs, documentation, and MCP servers from an OpenAPI specification.checked 4 Oct 2026
Where it runs
- Docs platform
- The Docs Platform keeps REST API, SDK, and narrative documentation in sync with the API and is built on Astro.checked 4 Oct 2026
Money
- Trial
- When users exceed the Free Plan terms, they are automatically enrolled in a 30-day free trial of a paid plan.checked 4 Oct 2026
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