Gemini 3.1 Pro (preview) API pricing
Gemini 3.1 Pro (preview) costs $2 per million input tokens and $12 per million output tokens. A typical chatbot request (about 1,500 input + 400 output tokens) costs $0.0080, or $7.95 per 1,000 requests.
0 characters0 words0 tokens (GPT o200k)
| Model | Per month |
|---|---|
| Gemini 3.1 Pro (preview) |
≈ = estimated token count: only OpenAI publishes its tokenizer. Claude counts use Anthropic’s published ratios; use the count_tokens API for an exact number.
Gemini 3.1 Pro (preview) price per million tokens
USD, Google standard tier. Prices checked on October 28, 2026.
| Token type | Price per 1M | With Batch API |
|---|---|---|
| Input | $2 | $1 |
| Cached input | $0.2 | $0.1 |
| Output | $12 | $6 |
| Input, prompts above 200K | $4 | $2 |
| Cached input, above 200K | $0.4 | $0.2 |
| Output, prompts above 200K | $18 | $9 |
Above 200K prompt tokens the higher rate applies to the whole request.
Model ID: gemini-3.1-pro-preview · Source: ai.google.dev
What a Gemini 3.1 Pro (preview) request costs
| Request | Per request | Per 1,000 |
|---|---|---|
| Short chat reply 500 input + 200 output tokens | $0.0034 | $3.45 |
| Chatbot turn with context 1,500 input + 400 output tokens | $0.0080 | $7.95 |
| Document Q&A (RAG) 8,000 input + 500 output tokens | $0.02 | $22.80 |
| Long-document summary 150,000 input + 2,000 output tokens | $0.34 | $339 |
Token counts are measured with GPT's o200k tokenizer and converted for Gemini 3.1 Pro (preview) (see below). No caching or batch discount.
Similarly priced models
| Model | Chatbot request | vs Gemini 3.1 Pro (preview) |
|---|---|---|
| GPT-6.1 Sol OpenAI | $0.0070 | −12% |
| GPT-6 Sol OpenAI | $0.0070 | −12% |
| Gemini 4 Argon Google | $0.0072 | −10% |
| GPT-5.6 Terra OpenAI | $0.0078 | −2% |
| Claude Sonnet 5.5 Anthropic | $0.0083 | +4% |
| Claude Sonnet 5 Anthropic | $0.0083 | +4% |
Frequently asked questions
How much does the Gemini 3.1 Pro (preview) API cost?
Gemini 3.1 Pro (preview) costs $2 per million input tokens and $12 per million output tokens on Google's standard tier, rising to $4 / $18 for prompts above 200K tokens. Prices checked on October 28, 2026.
How much does one Gemini 3.1 Pro (preview) request cost?
A typical chatbot request with about 1,500 input and 400 output tokens costs about $0.0080, or $7.95 per 1,000 requests. Paste your own prompt into the calculator on this page for an exact estimate.
Does Gemini 3.1 Pro (preview) support prompt caching?
Yes. Cached input costs $0.2 per million tokens, 90% less than regular input.
Does Gemini 3.1 Pro (preview) have a Batch API discount?
Yes: 50% off for requests sent through the Batch API, which may take up to 24 hours. That makes it $1 / $6 per million input / output tokens.
How are Gemini 3.1 Pro (preview) tokens counted?
Gemini 3.1 Pro (preview)'s tokenizer is not published. We estimate about 1.05× the GPT o200k count for the same text.