AI Desk · Model Identity · Evidence object

Tokenizer signature tk_a15512c7

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 Gemini group.

Members
1
First observed
21 August 2026
Last observed
21 August 2026
Group
Gemini

Models with this signature

Template variants of the same tokenizer

These signatures differ from this one by a uniform one-token shift on the affected strings: the same vocabulary behind a different chat template.

tk_59ca250f · 7 models

The measured vector

Marginal prompt-token cost per string, as measured on Google: Gemma 3n 4B
All 50 rows

English and whitespace

en-prose14
en-long16
spaces-203
spaces-604
tabs-203
newlines-203
mixed-ws9

Digits

digits-99
digits-1212
digits-3030
digits-sep12
float-long22

CJK

zh-common10
zh-long12
zh-rare25
ja-kana7
ja-kanji9
ko11

Other scripts

ru12
ar10
he13
hi8
th10
el13

Emoji

emoji-basic5
emoji-skin10
emoji-zwj-family7
emoji-zwj-x321
emoji-flags8
emoji-prof11

Rare Unicode

math26
boxdraw17
combining10
cjk-ext-b16
surrogates27
zalgo22
rtl-mix5

Code

py-code28
py-indent18
json28
html14
regex44
camel6
snake11

Repetition and encodings

rare-word-x526
repeat-tok22
base6434
hex16
url23
uuid36

Method: tokenizer fingerprinting, v1-50. Raw data: fingerprints.json · index.json · test-strings.json.