> Opus 4.8 built in Claude Code; GLM-5.2 built in Pi over OpenRouter.

It would be more interesting and accurate to see the comparison on the same harness if the intent is to compare the frontier models.

Pi is relatively new and does not have many features built-in compared to Claude Code. It was chosen intentionally this way as Pi's goal is not to create a bloat builtin of tools most don't use but to allow the users to customize to fit their need -- similar to Neovim vs IDE.

The end-user "vibe coding" experience is *heavily* swayed by the harness because prompt effectively drives how a model outputs an answer.