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Gemini 3.1 Pro API Pricing & Cost Calculator

Gemini 3.1 Pro provides flagship intelligence with a 1M token context window, 90% prompt caching discount, and tiered rates that increase above 200K tokens.

Gemini 3.1 Pro is Google's flagship reasoning engine, offering a context window of about 1 million tokens.

By TechCompare · Updated

Input tokens
100,000
per request
Output tokens
5,000
per request
Volume
100 / monthly
Standard API

Calculator

Cost Comparison

Based on 100,000 input tokens (50% cached), 5,000 output tokens, and 100 requests.Prices are fetched live from OpenRouter and may include temporary promotional discounts not accounted for in our article and comparison figures.

Same 100,000 in / 5,000 out (50% cached) scenario, pre-loaded. Adjust tokens, caching, or swap models.
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How this is calculated

For prompts up to 200K tokens, Gemini 3.1 Pro is priced at $2.00 per million input tokens and $12.00 per million output tokens. Cached input costs $0.20 per million, a 90% discount, and batch pricing is $1.00 per million input tokens and $6.00 per million output tokens. Above 200K, standard pricing rises to $4.00/M input and $18.00/M output, while cached input rises to $0.40/M.

Verdict

For prompts up to 200K, Gemini 3.1 Pro costs $2.00/M input and $12.00/M output, with cached input at $0.20/M and batch pricing at $1.00/$6.00. Above 200K, standard rates rise to $4.00/$18.00 and cached input rises to $0.40/M. The 1M token context window can hold large corpora, codebases, or document sets, while the 90% cached input discount cuts the cost of reusing a stable context block. Use the higher tier when estimating any prompt above 200K.

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Related guides

Prompt optimization
Cutting tokens is the cheapest way to cut cost.
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Token cost calculator
How per-token counts turn into API costs.
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Frequently asked questions

Does Gemini 3.1 Pro support prompt caching?
Yes. Google offers a 90% discount on cached input tokens. Cached input costs $0.20 per million for prompts up to 200K tokens and $0.40 per million above 200K.
How much does Gemini 3.1 Pro cost per million output tokens?
Gemini 3.1 Pro charges $12.00 per million output tokens for prompts up to 200K. With the 50% batch discount, that drops to $6.00 per million. Cached input costs $0.20 per million at this tier. Above 200K tokens, standard output rises to $18.00/M, input rises to $4.00/M, and cached input rises to $0.40/M.
Is Gemini 3.1 Pro cheaper than Claude Sonnet 4.6?
For prompts up to 200K, yes. Gemini costs $2.00/M input and $12.00/M output against Sonnet 4.6's $3.00/$15.00, while cached input is $0.20/M against $0.30/M. Gemini's rates rise above 200K, so compare the applicable tier for longer prompts. Gemini also has a roughly 1M context window against Sonnet 4.6's 500K.

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