Metis

Metis is an open source coding agent harness that runs in the terminal and as a desktop app. It wraps a language model with tooling for software engineering tasks, and the project states that the same model performs better inside Metis than inside OpenCode, citing a Terminal Bench result of roughly 82 percent against roughly 67 percent for OpenCode. It supports multiple models, so users are not tied to a single provider, and its design is aimed at people who already work with terminal agents such as Claude Code and OpenCode and want to compare or switch. The interface is available in English and Chinese. The site hosts documentation and a comparison page, and the code is published on GitHub under the MIT license. Installation is available through npm, pnpm or bun with a global package install, and there are downloads for macOS on Apple Silicon and for Windows as an installer or a portable zip. The site shows version 1.3.5. Metis is free to use. The site's structured data lists a price of zero and no paid plans are published. Users pay only the model providers they connect.