We Open Sourced R-CLI, the Coding Harness Above Every Published Terminal Bench 2.1 Result
R-CLI is now open source. MIT license. The whole harness. Repo: https://github.com/Backboard-io/Backboard-R-CLI First, the ask We are giving away the harness behind the highest scores ever recorded on Terminal Bench 2.1. Free, MIT, running on your own keys in about two minutes. The receipts are below, with public verifier logs for every claim. The entire price: Star the repo. Stars are how open…
R-CLI, a coding harness that runs above Terminal Bench 2.1 results, has been made open source under the MIT license. This harness is available at https://github.com/Backboard-io/Backboard-R-CLI. The creators argue that the harness is the dominant variable in coding performance, not the model itself. They claim that changing the harness can significantly improve the score of the same model, with R-CLI achieving a 5.14-point improvement over Claude Code with the same model.
The open source release includes a full Terminal Bench 2.1 submission, with public verifier logs for every claim. The only prerequisites to run R-CLI are Bun, Git, and ripgrep. The creators encourage the community to star and share the repo, and to run it on their own infrastructure to avoid vendor APIs that typically ship coding tools.
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