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AI Desk · Model IdentityWithdrawn

Google: Gemini 2.5 Pro Preview 05-06

google/gemini-2.5-pro-preview-05-06 · GoogleDeclared and measured agree
Tokenizer lineage (measured)
Gemini
Evidence confidence
High
Why high: an exact fingerprint shared with 19 models that declare the same family, without a second signal of a different kind yet.
Declared tokenizer tag
Gemini
Entered catalogue
7 May 2025
Last tested
3 September 2026
Measurement
Measured
Evidence
  • ✓ exact tokenizer signature shared with 19 models
Compare with Google: Gemini 3.8 Flash

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Withdrawn from the catalogue

First absent from the snapshot of 16 September 2026

Google: Gemini 2.5 Pro Preview 05-06 no longer appears in the OpenRouter catalogue. The record stays here because the measurements below were real when they were taken and this address has been published. A model leaving is the kind of change this product exists to notice, so it is kept rather than deleted.

Identity statement

Google: Gemini 2.5 Pro Preview 05-06 is Google's model. Its measured tokenizer sits with the Gemini group, which is evidence that it builds on the Gemini tokenizer. Tokenizer reuse is normal engineering, open vocabularies travel between labs, and this says nothing against Google's authorship of the model itself.

Evidence stack

Signals of different kinds, weighed together
SignalResultReference
Tokenizer signatureExact match with 19 other modelstk_59ca250f
API surfaceNo other entry shares this exact contractapi_407b73ff
Context and output1,048,576 context · 65,535 max outputdeclared
Reasoning contractMandatorydeclared
Serving providers observedGooglemeasured 3 September 2026

Shares this fingerprint

Exact signature first; template-boundary shifts of the same signature beneath
Google: Nano Banana (Gemini 2.5 Flash Image)google/gemini-2.5-flash-imageexact · 50/50Google: Gemini 2.5 Flash Litegoogle/gemini-2.5-flash-liteexact · 50/50Google: Gemini 2.5 Progoogle/gemini-2.5-proexact · 50/50Google: Gemini 2.5 Pro Preview 06-05google/gemini-2.5-pro-previewexact · 50/50Google: Gemini 3 Flash Previewgoogle/gemini-3-flash-previewexact · 50/50Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)google/gemini-3.1-flash-image-previewexact · 50/50Google: Gemini 3.1 Flash Litegoogle/gemini-3.1-flash-liteexact · 50/50Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)google/gemini-3.1-flash-lite-imageexact · 50/50Google: Gemini 3.1 Flash Lite Previewgoogle/gemini-3.1-flash-lite-previewexact · 50/50Google: Gemini 3.1 Pro Previewgoogle/gemini-3.1-pro-previewexact · 50/50Google: Gemini 3.1 Pro Preview Custom Toolsgoogle/gemini-3.1-pro-preview-customtoolsexact · 50/50Google: Gemini 3.5 Flashgoogle/gemini-3.5-flashexact · 50/50Google: Gemini 3.5 Flash Litegoogle/gemini-3.5-flash-liteexact · 50/50Google: Gemini 3.6 Flashgoogle/gemini-3.6-flashexact · 50/50Google: Gemini 3.7 Flashgoogle/gemini-3.7-flashexact · 50/50Google: Gemini 3.8 Flashgoogle/gemini-3.8-flashexact · 50/50Google: Gemma 3 12Bgoogle/gemma-3-12b-itexact · 50/50Google: Gemma 3 27Bgoogle/gemma-3-27b-itexact · 50/50Google: Gemma 3 4Bgoogle/gemma-3-4b-itexact · 50/50Google: Gemma 3n 4Bgoogle/gemma-3n-e4b-itsame tokenizer · template shift

Closest measured models

Agreement across the mutually clean test strings
Google: Gemini 3.7 Flashgoogle/gemini-3.7-flash50/50 · 100%Google: Gemma 3 4Bgoogle/gemma-3-4b-it50/50 · 100%Google: Gemma 3 12Bgoogle/gemma-3-12b-it50/50 · 100%Google: Gemma 3 27Bgoogle/gemma-3-27b-it50/50 · 100%Google: Gemini 2.5 Flash Litegoogle/gemini-2.5-flash-lite50/50 · 100%Google: Gemini 3.1 Flash Litegoogle/gemini-3.1-flash-lite50/50 · 100%

Click a row to open the full comparison.

The measured fingerprint

Marginal prompt-token cost of each test string, grouped by script
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-x525
repeat-tok21
base6434
hex16
url23
uuid36

An x marks a row excluded as corrupt (caching or provider interference detected during measurement). Overhead subtracted: 0 prompt tokens.

Declared record

What the catalogue claims about this model

Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...

Modalities
text+image+file+audio+video->text
Declared tokenizer
Gemini
Prompt price
$1.25 / M tokens
Completion price
$10.0 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_p

defaults: {"temperature":null,"top_p":null,"frequency_penalty":null}

Catalogue entry

History

Every observation, kept as taken
  • 7 May 2025Enters the OpenRouter catalogue declared as Gemini.
  • 3 September 2026Fingerprinted in the YFarmX catalogue sweep · 50 of 50 strings measured clean.
  • 3 September 2026YFarmX assessment: consistent with the Gemini family, high confidence.

Cite this page as the evidence record for Google: Gemini 2.5 Pro Preview 05-06: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.