Just about every harness is. This is common knowledge, no? Frontier lab TUI tend to steal from the OSS harnesses not the other way around.
Care to back that up with a benchmark? I've not seen that. OpenCode is on here, not exactly dominating though: https://artificialanalysis.ai/agents/coding-agents
Care to back that up with a benchmark? I've not seen that. OpenCode is on here, not exactly dominating though: https://artificialanalysis.ai/agents/coding-agents