12,160 Trials on GPT-5.4 Reveal Reproducible Cross-Script Artifact

rayanpal_ · reddit · 2026-08-05

A frozen study of 12,160 trials on gpt-5.4-2026-03-05 identified a reproducible Arabic–Hebrew hybrid Unicode artifact triggered by system prompts.

Changing exactly one Hebrew code point in the prompt caused the artifact occurrence rate to surge from 47.32% to 94.34%, a 47 percentage-point effect. Across 1,920 control trials, the artifact rate was 0%.

The paper documents this prompt-conditioned cross-script output regime without speculating on the model's consciousness, intention, or training provenance. All data and verification code are public.

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