Google: Gemini 3.1 Pro Preview Custom Tools
google/gemini-3.1-pro-preview-customtools
Our take
AI-assisted analysis based on the sources below. Suitability is an editorial assessment; test it on your own workload.
According to the OpenRouter catalog, google/gemini-3.1-pro-preview-customtools is a preview variant of Gemini 3.1 Pro tuned for improved tool selection, reportedly reducing overuse of a general bash tool when more efficient third-party tools are available. The catalog lists multimodal inputs (text, audio, image, video, file) with text output, a context window of about one million tokens, and mandatory reasoning with selectable effort levels. An independent model card was not available in this source pack, so these capabilities are catalog-reported rather than independently measured.[1]
Strengths
- The catalog reports multimodal inputs (text, audio, image, video, and file) with text output.[1]
- Context window of roughly one million tokens, per the catalog listing.[1]
- Variant reportedly tuned to prefer more efficient third-party tools over a general bash tool; reasoning effort is adjustable and tool-calling and structured-output parameters are supported.[1]
Limitations
- Evidence comes only from the OpenRouter catalog; no independent model card or benchmark results were in this source pack, so validate performance on your own workload.[1]
- The catalog marks reasoning as mandatory, so it cannot be disabled.[1]
- This is a preview model; the knowledge cutoff is not specified in the catalog data.[1]
Where to use it
- Agentic workflows that orchestrate many third-party tools, where disciplined tool selection matters; suitability should be verified in testing.[1]
- Multimodal document or media processing pipelines that produce text output, as an editorial suggestion pending workload validation.[1]
- Long-context tasks such as large codebase or corpus analysis, given the reported context window.[1]
Sources
- [1] OpenRouter catalog · Google: Gemini 3.1 Pro Preview Custom ToolsSources checked: Nov 13, 2026
About this model
Description below is the original text supplied by OpenRouter, shown in the source language.
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...
Specifications
- Model ID
- google/gemini-3.1-pro-preview-customtools
- Canonical ID
- google/gemini-3.1-pro-preview-customtools-20260219
- Creator
- Added to OpenRouter
- 25.02.2026
- Context length
- 1,048,576
- Modality
- text+image+file+audio+video->text
- Input modalities
- text, audio, image, video, file
- Output modalities
- text
- Token pricing
- USD per 1M tokens: in $2 / out $12
- Knowledge cutoff
- —
- Expiration date
- —
Tasks and capabilities
A grade appears only where the source supplies a matching measurement for that task, the model is active and the cohort holds at least 10 comparable models. The capability column lists facts the source declares — supported formats, reasoning and tool parameters — which are not measured quality.
| Task | Grade | Source-declared capability |
|---|---|---|
| General quality | No measurement | reasoning: mandatory · default medium · efforts: high, medium, low · parameters: include_reasoning, reasoning, reasoning_effort |
| Coding | No measurement | — |
| Agents | No measurement | parameters: structured_outputs, tool_choice, tools |
| Writing | No measurement | output: text |
| Reasoning | No measurement | reasoning: mandatory · default medium · efforts: high, medium, low · parameters: include_reasoning, reasoning, reasoning_effort |
| Document analysis | No measurement | input: file |
| Vision | No measurement | input: image |
| Image generation | No measurement | — |
| Audio | No measurement | input: audio |
| Video | No measurement | input: video |
| Embeddings | No measurement | — |
Evaluations
No evaluations are supplied for this model.
How grades work
Each letter grade compares a model only against other models scored by the same source and metric in the current snapshot. S means the top 10%, A the next 20%, B the next 30%, C the rest. Models without a published measurement are shown as not rated — a supported format alone never implies measured quality.
- S — S — top 10% of the cohort
- A — A — next 20% of the cohort
- B — B — next 30% of the cohort
- C — C — below the B band
Providers
Optional live provider statistics from OpenRouter. Missing values are unknown, not zero.
| Provider | Context length | Price in /1M | Price out /1M | Latency p50 (30m, s) | Throughput p50 (30m, tok/s) | Uptime (30m) |
|---|---|---|---|---|---|---|
| Google AI Studio | 1,048,576 | $2 | $12 | — | — | 100% |
Provider data retrieved: 13.11.2026
Related articles
No published articles identify this model yet.