Gemini 3.1 Pro Preview
Summary
Gemini 3.1 Pro Preview is a proprietary language model from Google DeepMind, released on 19 Feb 2026. It accepts text, images, video, audio and PDFs and generates text, with a 1M-token context window and up to 66K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2 per million input tokens and $12 per million output tokens (Gemini API), across 5 providers we track.
Reasoning-first Gemini preview for agentic coding and complex problem solving
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Google DeepMind |
|---|---|
| Release date | 19 Feb 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,048,576 tokens) [models.dev] |
| Max output | 66K tokens [models.dev] |
| Knowledge cutoff | Jan 2025 [models.dev] |
| Input | Text, images, video, audio and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Gemini 3.1 Pro Preview API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Gemini API gemini-3.1-pro-preview | $2 | $12 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| Google Vertex AI gemini-3.1-pro-preview | $2 | $12 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| Vercel AI Gateway google/gemini-3.1-pro-preview | $2 | $12 | $0.20 | 1M | models.dev, 4 Oct 2026 |
| OpenRouter google/gemini-3.1-pro-preview | $2 | $12 | $0.20 | 1M | OpenRouter, 4 Oct 2026 |
| Snowflake Cortex gemini-3.1-pro | – | – | – | 1M | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview has a context window of 1,048,576 tokens (1M) and can generate up to 65,536 tokens in a single response, according to models.dev.
How much does the Gemini 3.1 Pro Preview API cost?
Through Gemini API, Gemini 3.1 Pro Preview costs $2 per million input tokens and $12 per million output tokens. Prices last verified 4 Oct 2026.
Is Gemini 3.1 Pro Preview open source?
No. Gemini 3.1 Pro Preview is a proprietary model; Google DeepMind has not released its weights. It is available through APIs including Gemini API, Google Vertex AI, Vercel AI Gateway, OpenRouter.
When was Gemini 3.1 Pro Preview released?
Google DeepMind released Gemini 3.1 Pro Preview on 19 Feb 2026, according to models.dev.
Which providers offer Gemini 3.1 Pro Preview?
We track Gemini 3.1 Pro Preview on 5 providers: Gemini API, Google Vertex AI, Vercel AI Gateway, OpenRouter, Snowflake Cortex.
Change history
No changes detected since we started tracking this model. We re-check every source daily.
Sources
- https://github.com/sst/models.dev/blob/dev/providers/google/models/gemini-3.1-pro-preview.toml
- https://github.com/sst/models.dev/blob/dev/providers/google-vertex/models/gemini-3.1-pro-preview.toml
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/google/gemini-3.1-pro-preview.toml
- https://openrouter.ai/google/gemini-3.1-pro-preview
- https://github.com/sst/models.dev/blob/dev/providers/snowflake-cortex/models/gemini-3.1-pro.toml