Google: Gemini 3.1 Pro Preview Custom Tools

google/gemini-3.1-pro-preview-customtools · GoogleNot yet established

Declared family: Gemini
Evidence confidence: Unknown
Declared tokenizer tag: Gemini
Entered catalogue: 25 February 2026
Last tested: Not yet measured
Measurement: Awaiting measurement

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_816773ae
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 Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...

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

Supported parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstemperaturetool_choicetoolstop_p

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

Catalogue entry

History

Every observation, kept as taken

25 February 2026Enters the OpenRouter catalogue declared as Gemini.

Cite this page as the evidence record for Google: Gemini 3.1 Pro Preview Custom Tools: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.