Harness profile

OpenCode

MITTypeScript199k GitHub stars (Aug 2026)

MakerAnomaly

LicenseMIT

StackTypeScript

Models75+ providers via Models.dev, including local models

Runs whereYours to host - sandbox, credentials and audit trail are on you

Behavior changed byMarkdown instruction files

Durable memoryConfigurable

Drives other agentsNo

Best for

Running a harness against open-weight models on your own hardware, with the widest provider support.

Main weakness

Convenience reaches outward by default: until v1.2.23 (Mar 2026) it sent every prompt to Grok's free tier to name sessions. Session titles still go to a hosted model unless you change the setting.

Official docs / repo · Not sure? Run the chooser

Profile facts from the winder.ai comparison of nine agent harnesses (table checked Aug 19, 2026; DeepSeek Harness star count updated Sep 25, 2026 from the live GitHub repo) and vendor documentation. If something here is stale, the vendor page wins - tell us via the kit signup and we will fix it.