Google: Nano Banana Pro (Gemini 3 Pro Image Preview)

google/gemini-3-pro-image-preview · GoogleUnmeasurable

Declared family: Gemini
Evidence confidence: Unknown
Declared tokenizer tag: Gemini
Entered catalogue: 20 November 2025
Last tested: Not yet measured
Measurement: Deferred: measurement cost above the per-model cap

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Not measured	–
API surface	No other entry shares this exact contract	api_15971e12
Context and output	65,536 context · 32,768 max output	declared
Reasoning contract	Mandatory	declared
Serving providers observed	None recorded yet	–

Declared record

What the catalogue claims about this model

Nano Banana Pro is Google’s most advanced image-generation and editing model, built on Gemini 3 Pro. It extends the original Nano Banana with significantly improved multimodal reasoning, real-world grounding, and...

Modalities: text+image->text+image
Declared tokenizer: Gemini
Prompt price: $2.00 / M tokens
Completion price: $12.0 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningresponse_formatseedstopstructured_outputstemperaturetop_p

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

Catalogue entry

History

Every observation, kept as taken

20 November 2025Enters the OpenRouter catalogue declared as Gemini.

Cite this page as the evidence record for Google: Nano Banana Pro (Gemini 3 Pro Image Preview): the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.