Counterintuitive Test: GPT-5.6 Luna Medium Beats Max on Certain Benchmarks

JeremyNguyenPhD · x · 2026-08-14

The author discovered a counterintuitive phenomenon while testing GPT-5.6 Luna: although the Max tier is incredibly powerful and feels almost unlimited, the Medium tier actually performs better on internal benchmarks requiring careful, grounded answers based on policy documents.

This suggests that for specific tasks requiring more cautious and constrained responses, the medium-configured model might possess unexpected advantages.

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