# Cosmos Docs: Cosmos SDK

> Developer documentation for the Cosmos stack. Build secure, reliable, and high-performance blockchains.

## Cosmos SDK

- [Cosmos SDK / v0.55 (311 pages)](https://docs.cosmos.network/_llms/cosmos-sdk/v0-55.md): Documentation for Cosmos SDK / v0.55.
- [Cosmos SDK / next (131 pages)](https://docs.cosmos.network/_llms/cosmos-sdk/next.md): Documentation for Cosmos SDK / next.

## OpenAPI Specs

- [openapi](/sdk/latest/api-reference/rest/openapi.yaml)
- [openapi](/sdk/next/api-reference/rest/openapi.yaml)