Reason Machines
Reason Machines is a YC Fall 2026 (F26) company. Based in San Francisco, CA, USA. Team of 2.
About Reason Machines
Summary
Ara builds a cloud-based autonomous coding agent for software teams. It monitors work in progress, breaks down tasks, and executes them end-to-end using its own compute environment, background agents, persistent memory, and reusable skills. It replaces the manual handoff loop between developers and AI coding tools by planning, acting, and learning continuously inside the browser.
Go-to-market
Software engineering teams are the primary buyers, with access starting through a browser-based session interface that connects existing Claude, Codex, and other coding subscriptions into a shared collaborative environment.
From the Y Combinator listing
Reason is world's most effective agent on cost per task
Reason runs autonomous cloud agents with a frontier harness on cost per task. It delivers the same performance with 30-50% lower costs than other harnesses. By operating with a harness outside the sandbox, it acts seamlessly across cloud computers and local devices. Reason runs work from start to finish: from an issue to a finished pull request, on a schedule, or from a Slack alert. It is available as a Mac app, on the web, from the CLI, in Slack, and through a REST API, with about 100 integrations and shareable skills. Bring your own keys and subscriptions, and work rolls over to the next one when limits are hit.
Facts
- B2B / B2B -> Productivity
- San Francisco, CA, USA
- 2
- Active
- Early
Founders (2)
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