Spec Kit vs OpenCode (2026): Workflow Layer or Agent?

OpenCode and Spec Kit work at different layers, and the most common setup uses both. OpenCode is the agent that runs in your terminal and edits files. Spec Kit is a workflow you wrap around whichever agent you already use, and OpenCode is one of the integrations it ships with, alongside Claude Code, Copilot, Cursor, Qwen, Codex, Windsurf, and Zed. Initializing a project with the OpenCode integration generates the speckit commands into .opencode/commands/, and from there the spec drives what the agent builds.

Picking one still makes sense in plenty of cases. If you want an agent and nothing else, OpenCode on its own is the shorter path, and the spec format is overhead you haven't asked for. If your team already writes RFCs and you want that discipline applied across several agents rather than one, Spec Kit is the piece you're missing, and it will work with whatever agent you land on. The comparison below covers both on their own terms.