Google: Gemini 3.1 Pro Preview (batch)

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

Tokenizer lineage (measured): Gemini
Evidence confidence: High
Declared tokenizer tag: Gemini
Entered catalogue: 19 February 2026
Last tested: Not yet measured
Measurement: Variant: inherits its base model’s measurement

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

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.

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Not measured	–
API surface	Identical contract to 2 other entries	api_16435537
Context and output	1,048,576 context · 65,536 max output	declared
Reasoning contract	Mandatory · efforts high, medium, low · default medium	declared
Serving providers observed	None recorded yet	–

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.

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