21 model-harness pairs tested: framework choice barely moves success rate but swings cost
iScienceLuvr · x · 2026-09-19
A new analysis compares 21 model-harness pairs across 7 models and 3 harnesses and lands on three findings:
- Harness choice has little effect on task success rate, but can significantly change cost
- A simple harness can be competitive with more complex setups
- Models sometimes perform better on other harnesses than their own
The author makes a fairly compelling case that a simpler harness like Pi may be the better choice — for anyone picking an AI coding/agent framework, the takeaway is to prioritize simplicity and cost over feature bloat.
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