Dive into FrontierHarness Eval: Claude Code cost 5.6× for the same pass rate (runta.com)

Given the [K3 setup](https://runta.com/blog/introducing-frontierharness-eval/), how much of the cost gap comes from Claude Code’s harness design versus its fit with the model and caching backend?

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Claude Code is an opinionated harness. I’d love to see whether neutral harnesses can challenge the monolithic harness narrative.

Co-author here. Failed attempts still cost money, which is easy to miss when comparing pass rates.