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AI Desk · Model Identity

Google: Nano Banana 2 (Gemini 3.1 Flash Image)

google/gemini-3.1-flash-image · GoogleNot yet established
Tokenizer lineage (measured)
Gemini
Evidence confidence
Moderate
Why moderate: near-exact agreement (44 of 44 strings) with google/gemini-3.7-flash, short of a full exact signature.
Declared tokenizer tag
Gemini
Entered catalogue
18 June 2026
Last tested
22 August 2026
Measurement
Measured
Evidence
  • ✓ near-exact agreement (44/44) with google/gemini-3.7-flash
Compare with Google: Gemini 3.7 Flash

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Identity statement

Google: Nano Banana 2 (Gemini 3.1 Flash Image) 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 signatureMeasured with 6 corrupt rows excluded–
API surfaceNo other entry shares this exact contractapi_b8f53431
Context and output131,072 context · 32,768 max outputdeclared
Reasoning contractOptional · efforts high, minimal · default minimaldeclared
Serving providers observedGoogle, Google AI Studiomeasured 22 August 2026

Closest measured models

Agreement across the mutually clean test strings
Google: Gemini 3.7 Flashgoogle/gemini-3.7-flash44/44 · 100%Google: Gemma 3 4Bgoogle/gemma-3-4b-it44/44 · 100%Google: Gemma 3 12Bgoogle/gemma-3-12b-it44/44 · 100%Google: Gemma 3 27Bgoogle/gemma-3-27b-it44/44 · 100%Google: Gemini 2.5 Flash Litegoogle/gemini-2.5-flash-lite44/44 · 100%Google: Gemini 3.1 Flash Litegoogle/gemini-3.1-flash-lite44/44 · 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, 6 excluded as corrupt

English and whitespace

en-prosex
en-long16
spaces-20x
spaces-60x
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-familyx
emoji-zwj-x3x
emoji-flags8
emoji-profx

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 3.1 Flash Image, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines advanced...

Modalities
text+image->text+image
Declared tokenizer
Gemini
Prompt price
$0.50 / M tokens
Completion price
$3.00 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstemperaturetop_p

defaults: {}

Catalogue entry

History

Every observation, kept as taken
  • 18 June 2026Enters the OpenRouter catalogue declared as Gemini.
  • 22 August 2026Fingerprinted in the YFarmX catalogue sweep · 44 of 50 strings measured clean.
  • 22 August 2026YFarmX assessment: consistent with the Gemini family, moderate confidence.

Cite this page as the evidence record for Google: Nano Banana 2 (Gemini 3.1 Flash Image): the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.