Pricing · Google
Gemini 3.1 Pro Preview
Google's gemini-3.1-pro-preview, 1.0M tokens of context. Every number on this page was read off Google's own pricing
page — never estimated, never recalled from memory.
How Google describes it
“Our 3rd generation Pro model, built for multimodal understanding, agentic capabilities, and vibe-coding.”
From Google's documentation
- Versus its predecessor: “Built to refine the performance and reliability of the Gemini 3 Pro series, Gemini 3.1 Pro Preview provides better thinking, improved token efficiency, and a more grounded, factually consistent experience.” (model page, read October 1, 2026)
- What it is for: “It's optimized for software engineering behavior and usability, as well as agentic workflows requiring precise tool usage and reliable multi-step execution across real-world domains.” (model page, read October 1, 2026)
Pricing
| Input | $2.00 | per 1M tokens |
|---|---|---|
| Output | $12.00 | per 1M tokens |
| Cached input | $0.20 | per 1M tokens · 0.1× the input price |
| Cache storage | $4.50 | per 1M tokens per hour |
Long-prompt tiers
Pricing changes above a prompt-size threshold. If your average request is near the boundary, the effective rate is not the headline rate.
| Condition | Input | Output | Cached input |
|---|---|---|---|
| prompt > 200000 tokens | $4.00 | $18.00 | $0.40 |
At the calculator's starting volume, 1M input tokens and 200K output tokens with no cache hits, Gemini 3.1 Pro Preview costs $4.40: $2.00 for input and $2.40 for output, at the prices above. Same formula as the calculator; change the volume there.
Where this price sits
$2.00 per 1M input tokens (for prompts up to 200K tokens) is the 39th cheapest input price of the 67 current models with a verified price on this site, and the 11th of Google's 11. Output costs 6.0× the input price.
Other current models in the Gemini Pro family:
- Gemini 2.5 Pro 1.0M tokens $1.25 in · $10.00 out
Mentioned in
2 posts on this site cite Gemini 3.1 Pro Preview. The sentence is the post's own, taken from where it links here.
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Same List Price, Different Bill: Five Pairs of LLM APIs Where the Workload Decides What You Pay · September 30, 2026
GPT-5.6 Terra and Gemini 3.1 Pro Preview (both verified September 28, 2026) are the closest pair in the table.
-
Prompt Caching Is Not 10% Everywhere: What a Cache Hit Costs Across Eight Providers · September 16, 2026
On Gemini 2.5 Pro and Gemini 3.1 Pro Preview it is $4.50 per million cached tokens per hour, verified September 14, 2026.
Succession
Google names Gemini 3.1 Pro Preview as the replacement for:
- Gemini 3 Pro Preview retired shut down March 9, 2026
Specifications
| API model id | gemini-3.1-pro-preview | |
|---|---|---|
| Provider | ||
| Family | Gemini Pro | |
| Context window | 1.0M tokens | |
| Max output | 66K tokens | |
| Released | February 1, 2026 | |
| Status | Current | |
Gemini 3.1 Pro Preview was released on February 1, 2026. It returns up to 66K tokens per response, against a context window of 1.0M tokens.
Questions about Gemini 3.1 Pro Preview pricing
- How much does Gemini 3.1 Pro Preview cost per million tokens?
- $2.00 per 1M input tokens and $12.00 per 1M output tokens for prompts up to 200,000 tokens, read on Google's official pricing page on October 1, 2026.
- What does a cached input token cost on Gemini 3.1 Pro Preview?
- $0.20 per 1M cached input tokens, 10% of the $2.00 input price.
- Does Gemini 3.1 Pro Preview cost more for long prompts?
- Yes. For prompts over 200,000 tokens it costs $4.00 per 1M input tokens and $18.00 per 1M output tokens, $0.40 for cached input, against $2.00 and $12.00 below that.
Verified October 1, 2026 against Google's official pricing page. Confidence: confirmed. No price change recorded for this model. How the data is checked.
Other Google models with a verified price
- Gemini 2.5 Flash-Lite Gemini Flash-Lite $0.10 in · $0.40 out
- Gemini 3.5 Flash-Lite Gemini Flash-Lite $0.30 in · $2.50 out
- Gemini 2.5 Flash Gemini Flash $0.30 in · $2.50 out
- Gemini 3.8 Flash Gemini Flash $0.75 in · $3.75 out · promo
- Gemini 3.7 Flash Gemini Flash $0.75 in · $3.75 out · promo
- Gemini 3.6 Flash Gemini Flash $0.75 in · $3.75 out · promo
- Gemini Robotics ER 2 Preview Gemini Robotics $1.00 in · $5.00 out · promo
- Gemini Robotics ER 2 Streaming Preview Gemini Robotics $1.00 in · $5.00 out · promo
- Gemini 2.5 Pro Gemini Pro $1.25 in · $10.00 out
- Gemini 3.5 Flash Gemini Flash $1.50 in · $9.00 out
Cheaper or equally priced alternatives
Current models with an input price at or below $2.00 per 1M tokens.
- GPT-6.1 Sol OpenAI $2.00 in · $10.00 out
- GPT-6 Sol OpenAI $2.00 in · $10.00 out
- GPT-5.6 Terra OpenAI $2.00 in · $12.00 out
- Claude Sonnet 5.5 Anthropic $2.00 in · $10.00 out
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