[Meta Confirms Launch of Harness Tool, Open-Source Models Also on the Way] According to monitoring by Beating, Meta's Chief AI Officer Alexandr Wang stated at YC Startup School 2026 that the company will launch its own Harness tool and continue releasing open-source models. Harness is an agent runtime framework wrapped around models, similar to Claude Code. It is responsible for invoking tools, reading and writing files, and managing context, enabling models to continuously complete complex tasks. Meta had already planned to open-source some new models back in April this year. [Original Link]