Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows.
At a glance
- Input / 1M
- $2
- Output / 1M
- $12
- Context
- 1.05M
- Max output
- 66K
- Intelligence
- 29.7
- Released
- Feb 2026
Pricing
Gemini 3.1 Pro Preview API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $2 |
|---|---|
| Output tokensPer 1M tokens | $12 |
| Cached input (read)Per 1M tokens | $0.20 |
| Cache writePer 1M tokens | $0.38 |
| Long-context pricingPrompts above 200K tokens | $4 in / $18 out |
| Web searchPer request | $0.014 |
Chat message
2K in, 500 out
$10
per 1,000 requests
Coding task
30K in, 4K out
$108
per 1,000 requests
Long document summary
150K in, 2K out
$324
per 1,000 requests
Benchmarks
Gemini 3.1 Pro Preview benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
29.7
Coding index
68.8
Agentic index
8.2
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1.05M tokens
- Max output
- 66K tokens
- Input types
- Audio, File, Image, Text, Video
- Output types
- Text
- Reasoning effort
- High, Medium, Low
- Release date
- February 19, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
Gemini 3.1 Pro Preview vs other models
See how Gemini 3.1 Pro Preview stacks up head to head on price, benchmarks, and features.
VS
Gemini 3.1 Pro Preview vs Claude Opus 5.5
Google vs Anthropic
See comparisonVS
Gemini 3.1 Pro Preview vs GPT-6 Astra
Google vs OpenAI
See comparisonVSGemini 3.1 Pro Preview vs GLM 5.2
Google vs Z.ai
See comparisonVSGemini 3.1 Pro Preview vs Gemini 3.5 Flash
Google vs Google
See comparisonVSGemini 3.1 Pro Preview vs GPT-5.3-Codex
Google vs OpenAI
See comparisonVSGemini 3.1 Pro Preview vs Gemini 3 Flash Preview
Google vs Google
See comparisonAlternatives
Gemini 3.1 Pro Preview alternatives
Similar models worth considering, and where each one has the edge.
Z.ai
GLM 5.2
Gemini 3.5 Flash
OpenAI
GPT-5.3-Codex
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does Gemini 3.1 Pro Preview cost?
Gemini 3.1 Pro Preview costs $2 per 1M input tokens and $12 per 1M output tokens through the API. A typical chat message costs about $10 per 1,000 messages.
What is the context window of Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview accepts up to 1.05M tokens of input and can write up to 66K tokens in a single response.
What is the best alternative to Gemini 3.1 Pro Preview?
GLM 5.2 from Z.ai is a strong alternative. It offers: 1.5x cheaper output, higher intelligence score, newer release.
Can I use Gemini 3.1 Pro Preview alongside other models?
Yes. Shortcut Chat sends one prompt to Gemini 3.1 Pro Preview and any other models you pick at the same time, so you can compare answers side by side.
Try Gemini 3.1 Pro Preview next to every other model.
Use Gemini 3.1 Pro Preview alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.