Google: Gemini 3.1 Pro Preview (batch)

google/gemini-3.1-pro-preview:batch · GoogleDeclared and measured agree

Tokenizer lineage (measured): Gemini
Declared tokenizer tag: Gemini
Entered catalogue: 19 February 2026
Measurement: Variant: inherits its base model’s measurement
Evidence confidence: High

Why high: inherited from google/gemini-3.1-pro-preview: a serving variant shares its base model's tokenizer.

Evidence

✓ inherited from google/gemini-3.1-pro-preview: a serving variant shares its base model's tokenizer

Compare with Google: Gemini 3.1 Pro Preview

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This entry is a serving variant of Google: Gemini 3.1 Pro Preview. A variant shares its base model's tokenizer by construction, so the measurement lives on the base record and this page inherits it.

Identity statement

Google: Gemini 3.1 Pro Preview (batch) 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.

What we checked

Four different kinds of evidence, and what each one showed

We checked	What we found	Where it came from
How it counts tokens	Not measured yet	we measured it
How its API is set up	Set up identically to 2 other listings, field for field	api_16435537
How much it can read and write	Reads up to 1,048,576 tokens at once, writes up to 65,536	its own listing
Whether it thinks before answering	Always reasons, and cannot be turned off, at high, medium, low, medium by default	its own listing

Declared record

What the catalogue claims about this model

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...

Modalities: text+image+file+audio+video->text
Declared tokenizer: Gemini
Prompt price: $1.00 / M tokens
Completion price: $6.00 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_p

defaults: {"temperature":null,"top_p":null,"top_k":null,"frequency_penalty":null,"presence_penalty":null,"repetition_penalty":null}

Catalogue entry

History

Every observation, kept as taken

19 February 2026Enters the OpenRouter catalogue declared as Gemini.