Sideko – Hybrid deterministic/LLM generator for API SDKs and docs

In plain words

Sideko is a code generator that creates and maintains API client SDKs from OpenAPI specifications. Unlike traditional generators that overwrite code with each update, Sideko uses pattern matching to understand existing codebases and make incremental changes while preserving custom developer modifications. It combines deterministic logic with language models to produce natural-looking code that doesn't require constant manual rework when APIs change.

written from the facts on this page · September 2026

From the sources

Generate SDKs and docs for your API. Contribute to Sideko-Inc/sideko development by creating an account on GitHub.

Traditional codegen is fast and reliable but rigid - change your API spec and you get predictable, identical output every time. LLM codegen is adaptive and intelligent but inconsistent - ask it to generate the same SDK twice and you'll get different results. This new hybrid approach gives you both: the reliability of deterministic generation for your core SDK structure, with LLM intelligence layered on top for adaptive features like intelligent parameter handling, context-aware documentation, and smart error recovery. The system runs deterministic codegen to establish the SDK structure. Then LLMs enhance specific components where adaptability adds value - like generating contextual…from github.com

In the maker’s words, at launch

Hi HN, I’m Patrick. Elias, Kevin, and I are building Sideko (https://sideko.dev), a new type of code generator for building and maintaining API client SDKs from OpenAPI specs. Traditional SDK generators rely on static templates that produce rigid, machine-generated code. When the API changes, these…

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  Hi Hacker News! Patrick and Elias here. We built an SDK / Documentation generator for REST APIs. The link included shows the shiny output of our system: the docs! We generated 5 SDKs and docs from the Hacker News OpenAPI we found on GitHub. If you write code in Python, Typescript, Go, Ruby, or Rust, we’d love for you to try an SDK out! If you want to generate SDKs for your own API try our tool here: https://github.com/Sideko-Inc/sideko We are both software engineers, and we built this tool because we were spending too much time writing API integrations, supporting…

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