Coasty Review 2026: A Computer Use Agent API That Sells the Harness, Not the Model
Coasty is a hosted computer use agent API: you send a screenshot and a plain-language instruction, and it returns typed mouse and keyboard actions, backed by managed cloud desktops, retries, schedules, and an audit trail. It sells the harness around a vision model, not the model itself — and its own benchmark numbers verify unevenly. That second sentence is the entire review. Coasty is a YC S26 company that launched on Hacker News in July 2026 as “an API for computer-use agents,” and the product it actually ships is not a smarter vision model. It is the operational layer that every team building on raw computer-use tool calls eventually has to write themselves: VM lifecycle, the screenshot-action loop, action execution, retries, human approval gates, scheduling, and a per-action evidence trail. ...