Comment by Hfuffzehn

You have correctly identified that getting a "high-quality harness (ie preloaded instructions from md files, including custom skills)" is the (or at least a) hard part.

Because you have to adjust the harness to your problem space and provide that so you can say it is high-quality.

Many people will stop that discussion at the claude code vs. codex vs. opencode level and then merge that with discussing model performance.

And that is also why "Generate an SVG of a pelican riding a bicycle" is still a benchmark worth discussing. Because at least it is a defined problem space.