␣YYSTACK

A bison/yacc parser identifier that is “polysemantic” for ChatGPT — perceived as a different word each time; recommended by Watkins as one of the most interesting tokens to play with.

" YYSTACK"

␣marks a real space; the symbol itself is not part of the token, and copying preserves it.

Observed behaviors

• 01Repeat requests yield variable words, spellings and meanings per attempt; nondeterministic at temperature 0 on gpt-3.5-turbo.LessWrong
• 02Martin Fell's search ran on 2023-05-09 on the free ChatGPT (GPT-3.5 Default), with nondeterminism re-tested on Playground's gpt-3.5-turbo at temperature 0, and the anomaly confirmed on Bing AI as well.LessWrong

References

• A Search for More “Unspeakable” Glitch Tokens — LessWrong