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给主人留下些什么吧

Chinese guestbook boilerplate (the form without the trailing space); an o200k glitch token.

Raw token

"给主人留下些什么吧"

Observed behaviors

  • 01In xcloche's tests, GPT-5, GPT-4o and o3 all broke down.note.comDemo
  • 02It has served as a fingerprint: it helped establish that the mystery model “Horizon beta” uses OpenAI's o200k tokenizer.note.com
Observed or documented on
GPT (OpenAI)
Behavior types
UnspeakableFingerprint
Tokenizer
o200k_base
Discovered by
xcloche

References