AI ToolsAug 13, 2026, 2:12 PM

We Open Sourced R-CLI, the Coding Harness Above Every Published Terminal Bench 2.1 Result

30-second summary

The R-CLI coding harness, used to generate Terminal Bench 2.1 results, has been released as open source under the MIT license.

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We Open Sourced R-CLI, the Coding Harness Above Every Published Terminal Bench 2.1 Result
Key takeaways
  • R-CLI 2.1 is now open source under the MIT license, enabling public access to the terminal benchmark harness.
  • The tool was used to generate Terminal Bench 2.1 results, a benchmark for terminal-based AI coding assistants.
  • Open sourcing the harness promotes reproducibility and transparency in AI benchmarking.
  • Full codebase, documentation, and setup instructions are available for developers.
Full story

R-CLI, a coding harness designed to standardize terminal-based benchmarking, has been made publicly available under the MIT license. The tool was previously used to generate results for Terminal Bench 2.1, a benchmark suite focused on evaluating terminal-based AI coding assistants. By open sourcing the harness, developers can now replicate, modify, and extend the benchmarking process for their own projects.

The release includes the full codebase, documentation, and setup instructions, allowing researchers and engineers to integrate R-CLI into their workflows. This move aligns with broader trends in open benchmarking, where transparency and reproducibility are prioritized to improve AI tool reliability. The MIT license ensures broad accessibility without restrictive legal barriers.

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Why this matters
Developers

Provides a reusable, transparent tool for benchmarking terminal-based AI coding assistants.

Everyone

Advances open benchmarking standards in AI tool evaluation.

Glossary
Terminal Bench 2.1
A benchmark suite for evaluating terminal-based AI coding assistants.
MIT license
A permissive open source license allowing free use, modification, and distribution.
Sources · 1
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