What is Metis and what is verified harness lift?

Metis is an open-source coding agent harness with verified same-model performance lift. On Terminal-Bench, Metis achieves ~82% with the same model where OpenCode scores ~67%. The harness wraps around your chosen model with closed-loop verification, test execution, and self-healing.

Why switch from Claude Code or OpenCode to Metis?

Switching from Claude Code: same capability with more freedom — not locked to one vendor, MIT licensed, multi-model support. Switching from OpenCode: verified same-model harness lift means measurably better results, not just 'good enough'.

Which models and platforms does Metis support?

Metis supports multiple model providers: Claude, DeepSeek, OpenAI, Ollama. Runs on macOS (Apple Silicon & Intel), Windows, and Linux. Both terminal TUI and desktop GUI interfaces available.

Metis

Same model, verified harness lift for coding agents

MIT · Multi-model · Terminal & Desktop · Terminal-Bench ~82% same model (vs OpenCode ~67%)

Download for macOS

GitHub

npm i -g @wholiver_hu/metis

Metis

Open-Source Coding Agent with Verified Same-Model Harness Lift