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FrontierHarness Eval benchmarks nine software engineering harnesses on a single model, showing that cost per successful task can vary by up to 17x depending on the harness used.
The author tests multiple coding agent harnesses (GitHub Copilot, Pi, Claude Code, OpenCode) using the same Qwen3.6 27B model, finding that harness design significantly impacts performance, with OpenCode excelling at web searches and web development, and GitHub Copilot struggling with file editing tools.