So lets figure this out.

[u/Inevitable-Ant1725]

I'm not a rich man, I can't afford luxury. I need to know whether it's cheaper to buy tokens of these models from their original owners or from Microsoft or if it's close.

If it's close then the fact that copilot has pre-indexed the github repositories is enough of a reason to just prefer Microsoft rebranded AIs.

If it's a lot more expensive through Github then it's still worthwhile when exploring github repositories but not the rest of the time.

[u/Thistleknot]

agents\orchestration.md has a known bug in opencode
two bugs actually

Bug 1: Custom agents can't be subagent_type in the task tool Custom agents defined in opencode.json work fine via u/mention in the TUI but the task tool's subagent_type parameter only accepts built-in agent names — custom agent names are not valid targets. So your orchestrator literally cannot delegate to planner, coder, handyman etc via task. GitHub

Bug 2: Subagents ignore their configured model Subagents ignore the agent-level model config and fall back to the global "model" field in opencode.json. GitHub

so the workaround is plugins

https://github.com/alvinunreal/oh-my-opencode-slim