Gemini 3.1 Pro Preview
$2.00 per 1M input tokens and $12.00 per 1M output tokens · 1.05M context · vision, audio, tools, reasoning, JSON.
Prices checked Oct 21, 2026 · tracked by LLM Cost Index since Oct 21, 2026
Cheaper ways to run the same model: Gemini 3.1 Pro Preview (batch) at $1.00 / $6.00 — same model, different service (e.g. batch processing with a delay).
What Gemini 3.1 Pro Preview costs per month
Estimated monthly bill for typical workloads, using the cached-input price for repeated context. Try your own numbers in the cost calculator.
| Workload | Per month |
|---|---|
| Customer chatbot 1,000 conversations a day, 8 turns each | $1,339 |
| Document Q&A (RAG) 500 questions a day over retrieved documents | $254 |
| Coding / tool-using agent 200 tasks a day, long tool-heavy contexts | $522 |
| Content generation 30 long articles a day | $32.40 |
| Classification / extraction 100,000 short items a day | $2,340 |
Prompts above 200K tokens are billed at $4.00 input / $18.00 output per 1M.
Price history
We started tracking Gemini 3.1 Pro Preview on Oct 21, 2026; the chart appears as soon as there is a second data point. See all recent price changes.
Where to run Gemini 3.1 Pro Preview: 6 providers
Google AI Studio is the cheapest at $1.00 input / $6.00 output per 1M tokens. Uptime is the average over the last 30 days as reported by OpenRouter; see provider reliability.
| Provider | Input / 1M | Output / 1M | Context | Uptime | Notes |
|---|---|---|---|---|---|
| Google AI Studio | $1.00 | $6.00 | 1.05M | 100% | flex tier |
| $1.00 | $6.00 | 1.05M | 42.8% | flex tier | |
| Google AI Studio | $2.00 | $12.00 | 1.05M | 99.7% | — |
| $2.00 | $12.00 | 1.05M | 99.4% | — | |
| Google AI Studio | $3.60 | $21.60 | 1.05M | — | priority tier |
| $3.60 | $21.60 | 1.05M | 100% | priority tier |
Cheaper alternatives to Gemini 3.1 Pro Preview
Models with the same tool calling, image input, structured output for at least 20% less (3:1 input/output mix), most capable first.
| Model | Input / 1M | Output / 1M | Context | Capabilities |
|---|---|---|---|---|
| Muse Spark 1.3 Meta | $1.25 | $4.25 | 1.05M | visiontoolsreasoningJSON |
| Grok 4.7 xAI | $2.00 | $6.00 | 500K | visiontoolsreasoningJSON |
| MiMo-V2.6-Pro Xiaomi | $0.435 | $0.87 | 1.05M | visionaudiotoolsreasoningJSONopen weights |
| $2.00 | $6.00 | 1M | visiontoolsreasoningJSON | |
| Grok 4.6 xAI | $2.00 | $6.00 | 500K | visiontoolsreasoningJSON |
How to pay less for Gemini 3.1 Pro Preview
For a customer chatbot (1,000 conversations a day, 8 turns each) that costs $1,728 a month at list price without caching:
| Option | Per month | You save |
|---|---|---|
| Move to Muse Spark 1.3 (similar capabilities) | $569 | $1,159 (67%) |
| Switch to Gemini 3.1 Pro Preview (batch) | $864 | $864 (50%) |
| Route to Google AI Studio (flex tier) | $864 | $864 (50%) |
| Use prompt caching (60% of input cached) | $1,339 | $389 (22%) |
Other workloads: cut-your-bill tool for Gemini 3.1 Pro Preview.
Specifications
| Model ID | google/gemini-3.1-pro-preview |
| Input | audio, file, image, text, video |
| Output | text |
| Tool calling | Yes |
| Structured output | Yes |
| Reasoning mode | Yes |
| Open weights | No |
| Released | Feb 19, 2026 |
| Web search | $0.014 per request |
FAQ
- How much does Gemini 3.1 Pro Preview cost?
- $2.00 per million input tokens and $12.00 per million output tokens; cached input costs $0.20 per million. Prompts over 200K tokens are billed at $4.00 / $18.00. Prices as of Oct 21, 2026.
- What is the context window of Gemini 3.1 Pro Preview?
- 1.05M tokens, with up to 66K output tokens per response.
- Does Gemini 3.1 Pro Preview support images, tools and structured output?
- Images as input: yes. Tool calling: yes. Structured (JSON) output: yes. Reasoning mode: yes.
- What are cheaper alternatives to Gemini 3.1 Pro Preview?
- Models with the same key capabilities for at least 20% less include Muse Spark 1.3 ($1.25 / $4.25), Grok 4.7 ($2.00 / $6.00), MiMo-V2.6-Pro ($0.435 / $0.87).
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