Reason Machines
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About Reason Machines
YC company profile
Reason is the AI teammate for work and code.
Reason is an AI teammate for work and code that runs autonomous cloud agents with a frontier harness on cost per task.
It delivers the same performance with 22% lower costs than Codex. 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.
- YC batch: Spring 2026
- Founded: 2026
- Team size: 2
- Location: San Francisco
- Country: US
- Status: Active
- Industry: B2B
- Stage: Early
- Tags: Developer Tools, Enterprise Software, Cloud Computing
- YC partner: Aaron Epstein
Founders
Adi Singh — Cofounder
co-founder @ Reason Machines
EECS @ UC Berkeley, Cybernetics NTNU
Prev built a rust based IDE from scratch
21
Sven Myhre — Co-founder
Co-founder of Reason Machines (YC P26)
Building autonomous software-engineering agents. Studied EECS at UC Berkeley as a NORAM Scholar and Cybernetics & Robotics at NTNU. Won the 2025 Norwegian AI Championship and “Most Technically Impressive” at the Supabase AI Hackathon at YC, built stochastic prediction models at F100, and was president of Cogito, Norway’s largest learned society for AI.
Source: Y Combinator · Retrieved 2026-11-02. Company information is self-reported on YC.