AI Desk · AI Fingerprinting · Evidence object
Tokenizer signature tk_310f7ba9
An exact tokenizer signature: every model listed below returned the same marginal prompt-token count on all 50 test strings. Sharing a signature is strong evidence of a shared vocabulary. This signature sits in the Claude · group B group.
- Members
- 2
- First observed
- 5 October 2026
- Last observed
- 8 October 2026
- Group
- Claude · group B
Models with this signature
The measured vector
Marginal prompt-token cost per string, as measured on Anthropic: Claude Haiku 5.5All 50 rows
English and whitespace
en-prose24
en-long28
spaces-204
spaces-606
tabs-204
newlines-204
mixed-ws9
Digits
digits-93
digits-124
digits-3010
digits-sep7
float-long9
CJK
zh-common18
zh-long24
zh-rare20
ja-kana12
ja-kanji16
ko19
Other scripts
ru14
ar21
he18
hi23
th25
el22
Emoji
emoji-basic10
emoji-skin25
emoji-zwj-family14
emoji-zwj-x342
emoji-flags24
emoji-prof27
Rare Unicode
math46
boxdraw28
combining6
cjk-ext-b16
surrogates54
zalgo36
rtl-mix11
Code
py-code30
py-indent19
json29
html18
regex63
camel16
snake14
Repetition and encodings
rare-word-x555
repeat-tok60
base6447
hex18
url26
uuid27
Method: tokenizer fingerprinting, v1-50.