Google: Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview from Google is an advanced AI model capable of processing extensive text (up to 1,048,576 tokens), along with audio, files, images, and video inputs. It supports reasoning and can handle both unstructured and structured outputs, making it versatile for a wide range of tasks. Given its high benchmark blended score of 76.7 across four independent tests, Gemini 3.1 Pro Preview is suitable for professionals who require robust AI capabilities in coding and agentic tasks. However, the cost at $2.0 per million input tokens and $12.0 per million output tokens might be a consideration; this pricing could make it less accessible for frequent or extensive use compared to models with lower costs.
Benchmark results
Independent, published benchmarks. Blended score 76.7 across 4 benchmarks, last refreshed 2026-08-13. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 78.8 |
| AI Index Coding | software engineering tasks | 100.0 |
| AI Index Agentic | multi-step tool-using tasks | 38.0 |
| EQ-Bench | emotional understanding in dialogue | 74.3 |
- Model ID
- google/gemini-3.1-pro-preview
- Vendor
- Released
- February 2026
- Tokenizer
- Gemini
- Input Modalities
- audio, file, image, text, video
- Output Modalities
- text
- Max Output
- 65,536 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- ✓ accepts audio
- Moderated
- no
What it costs in practice
Computed from the current $2.00/M input and $12.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.08 |
| Classify 1,000 customer emails | 500k in / 50k out | $1.60 |
| A month of a busy support chatbot | 5M in / 2M out | $34.00 |
Strong choice for
Category rankings
Where Google: Gemini 3.1 Pro Preview places across the 36 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #1 | Audio SummarizationVoice · of 25 ranked | 163 |
| #1 | Video SummarizationVideo · of 25 ranked | 163 |
| #12 | Code DocumentationCode · of 25 ranked | 145 |
| #12 | OCR / Document ParsingData · of 25 ranked | 147 |
| #12 | Table Extraction from PDFsData · of 25 ranked | 147 |
| #12 | Meeting NotesBusiness · of 25 ranked | 154 |
| #13 | CSV / Spreadsheet CleanupData · of 25 ranked | 156 |
| #13 | Transcript CleanupWriting · of 25 ranked | 144 |
| #14 | Code RefactoringCode · of 25 ranked | 169 |
| #14 | ETL ScriptingData · of 25 ranked | 158 |
| #14 | Long-Document SummarizationWriting · of 25 ranked | 165 |
| #14 | Medical Note SummarizationProfessional · of 25 ranked | 158 |
| #14 | History TutoringEducation · of 25 ranked | 148 |
| #14 | RFP ResponseBusiness · of 25 ranked | 179 |
| #14 | RAG PipelinesAgents · of 25 ranked | 169 |
| #14 | Long-Context Q&AAgents · of 25 ranked | 160 |
| #14 | Character RoleplayPersonal · of 25 ranked | 153 |
| #15 | Legal ResearchProfessional · of 25 ranked | 173 |
| #15 | Contract ReviewProfessional · of 25 ranked | 182 |
| #15 | Scientific ResearchProfessional · of 25 ranked | 173 |
| #15 | Fiction CollaboratorPersonal · of 25 ranked | 173 |
| #15 | Literature ReviewResearch · of 25 ranked | 173 |
| #17 | Creative WritingWriting · of 25 ranked | 161 |
| #17 | Screenwriting & DialogWriting · of 25 ranked | 161 |
| #17 | Academic WritingWriting · of 25 ranked | 161 |
| #17 | Legal DraftingProfessional · of 25 ranked | 161 |
| #17 | OKRs & Strategic PlanningBusiness · of 25 ranked | 161 |
| #17 | Math ProofsResearch · of 25 ranked | 161 |
| #19 | CI/CD PipelinesCode · of 25 ranked | 146 |
| #19 | Physics TutoringEducation · of 25 ranked | 149 |
| #20 | Code ReviewCode · of 25 ranked | 170 |
| #20 | Blog Post WritingWriting · of 25 ranked | 141 |
| #20 | Essay GradingEducation · of 25 ranked | 170 |
| #20 | TTS ReplacementVoice · of 25 ranked | 115 |
| #20 | Trip PlanningPersonal · of 25 ranked | 141 |
| #24 | Unit Test GenerationCode · of 25 ranked | 155 |
Similar models
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Quick answers
- How much does Google: Gemini 3.1 Pro Preview cost?
- $2.00 per million input tokens and $12.00 per million output tokens.
- What is Google: Gemini 3.1 Pro Preview's context window?
- 1,048,576 tokens, roughly 1,572 pages of text in a single request.
- Does Google: Gemini 3.1 Pro Preview support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Google: Gemini 3.1 Pro Preview process images?
- Yes, it accepts image input.