Gemini 3.1 Pro Preview Custom Tools
Provider：Google
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...
Key specs
- Context：1M
- Max output：65.5K
- Tokenizer：Gemini
- Released：2026-02-25
Token pricing
- Input price：$2.00 / 1M tokens
- Output price：$12.00 / 1M tokens
- Cache read：$0.200 / 1M tokens
- Cache write：$0.375 / 1M tokens
- Blended price：$4.50 / 1M tokens
- Image price：$0.0020 / image
Modalities
Text, Audio, Image, Video, File
Use Cases
- Deep Reasoning & Analysis：Process long legal docs, academic papers, financial reports; multi-hop reasoning and evidence-chain tracing across huge contexts.（≈ $0.096/call）
- Vision Understanding & Generation：Recognize data trends in charts, OCR scanned docs, analyze photos and produce structured reports.（≈ $0.072/call）
- Voice Interaction：Speech recognition & transcription, mixed CN/EN and dialect support — meeting notes, QA.
When to pick this model
Signals derived from public pricing and spec fields — not a benchmark. Validate with official docs and your own eval.
- Long context (>=1M tokens): well-suited for long-doc QA, code-base analysis, multi-turn agents.
- Long max output (>=30K tokens): strong fit for deep report / essay / document-drafting workflows.
- Multimodal (text+image): fit for image captioning, OCR, chart QA, vision-grounded reasoning.
- Audio support: fit for speech-to-text / voice agent / transcript analysis.
- Video input support: fit for video understanding, frame QA, content moderation.
- File / PDF input support: fit for document parsing, contract review, RAG over private data.
FAQ
- What is the token pricing of Gemini 3.1 Pro Preview Custom Tools? Input price $2.00 / 1M tokens, output price $12.00 / 1M tokens, blended about $4.50 / 1M tokens. Refer to Google’s official page for the exact rate.
- What context window does Gemini 3.1 Pro Preview Custom Tools support? Context window is 1M, max output about 65.5K, suitable for long documents, multi-turn chat and complex reasoning.
- What scenarios is Gemini 3.1 Pro Preview Custom Tools best for? Based on its capability and pricing, Gemini 3.1 Pro Preview Custom Tools fits best: Deep Reasoning & Analysis, Vision Understanding & Generation, Voice Interaction. See the Use Cases section for details and cost estimates.
- What input/output modalities does Gemini 3.1 Pro Preview Custom Tools support? Supports Text, Audio, Image, Video, File modality.
- Is Gemini 3.1 Pro Preview Custom Tools a free model? Gemini 3.1 Pro Preview Custom Tools is billed per token, not a free model.
- Which provider offers Gemini 3.1 Pro Preview Custom Tools? Gemini 3.1 Pro Preview Custom Tools is offered by Google.
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