---
title: "Reason — autonomous software engineer for GitHub"
description: "Connect a repo, assign issues, and Reason's cloud agents open evidence-backed pull requests."
url: "https://reasonmachines.com/"
---

# Reason

Reason is an autonomous software engineer for GitHub. Connect a repository, assign issues, and Reason's cloud agents open evidence-backed pull requests with screen recordings, logs, and review-ready diffs. People drive Reason from the web app at https://reasonmachines.com; programmatic per-user access is available through the HTTP API documented at https://reasonmachines.com/llms.txt.

## Pages

Every page is also available as clean Markdown: append `.md` to any URL, or send `Accept: text/markdown`. The entire site as one file: https://reasonmachines.com/llms-full.txt

### Product

- [Get Reason](https://reasonmachines.com/download.md): Reason for Mac, the terminal, and the browser. Sign in once and your sessions follow you.

### Company

- [Reason Index](https://reasonmachines.com/blog.md): Product updates, engineering deep-dives, and how teams ship with Reason.
- [Changelog](https://reasonmachines.com/news.md): What's new in Reason: features, fixes, and infrastructure.
- [Contact Reason](https://reasonmachines.com/contact.md): Get in touch with the Reason Machines team.
- [Building the future of coding.](https://reasonmachines.com/about.md): We are building the software factory we wanted as engineers: fast enough to keep up with ideas, careful enough to trust with real repositories, and opinionated enough to make the whole loop better each time it runs.

### Blog

- [Software Engineering on autopilot. Reason 1.0](https://reasonmachines.com/blog/ara-on-the-web.md): Introducing Reason 1.0. Describe the work, follow the progress, and review the result—on web, desktop, and mobile.
- [Reason for macOS](https://reasonmachines.com/blog/ara-for-macos.md): Run cloud sessions and let Reason work with your local files, tools, and ports.
- [Rust harness wars: grok-build vs codex](https://reasonmachines.com/blog/rust-harness-wars.md): We cloned xAI's grok-build and OpenAI's codex and read both line by line, twenty subsystems each, to see where two labs building the same coding agent actually diverge.
- [Deal for YC founders](https://reasonmachines.com/blog/yc.md): Current and alumni YC companies redeem Reason credits through Bookface. Autonomous engineering for founders.
- [Building the software factory](https://reasonmachines.com/blog/about.md): We are building the software factory we wanted as engineers: fast enough to keep up with ideas, careful enough to trust with real repositories.

### Use cases

- [Turn every alert into a closed loop](https://reasonmachines.com/use-cases/operations.md): Reason watches the systems you run, triages each signal against the playbook, and acts. What used to page a human at 3am now opens a verified pull request instead.
- [From issue to verified pull request, one context.](https://reasonmachines.com/use-cases/engineering.md): Reason reads the issue, reproduces it in an isolated workspace, writes the fix, and verifies it before asking for review. The whole sdlc runs in a single thread of context.
- [Point a question at the repo. Get a cited answer.](https://reasonmachines.com/use-cases/research.md): Reason runs an agentic research pass over a codebase or problem, traces the real call paths, and reports findings with a citation behind every claim. Each run also writes back what it learned, so the next one starts smarter.

### 简体中文

- [Reason：GitHub 自主软件工程师](https://reasonmachines.com/zh-hans.md): Reason 理解您的代码库、使用您的工具，并将清晰的需求转化为经过验证、可供审查的代码变更。
- [Reason 企业版](https://reasonmachines.com/zh-hans/enterprise.md): Reason 在您的云和安全控制范围内交付经过验证的拉取请求，并为每次运行保留签名记录。
- [面向工程团队的 Reason](https://reasonmachines.com/zh-hans/use-cases/engineering.md): Reason 在一个上下文中读取问题、复现问题、编写修复并完成验证，然后再请求代码审查。