Redditor has Opus build open-source interpretability tool for Gemma-4-31B
New_Alps_5655 · reddit · 2026-10-18
A Reddit user discovered their Opus subscription was routing to Fable 5.5, so they had the model build an interpretability instrument based on the latest public research, now open-sourced as whp199/logos-theodolite.
The tool targets Gemma-4-31B-it, analyzing J-lens geometry and circuits, and includes an adversarially verified study of whether Gemma 4 is "female-coded". The author describes the result as feeling like "an illuminated manuscript from the age of discovery".
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