Gemini 3.1 Pro API Pricing & Cost Calculator

Q: Does Gemini 3.1 Pro support prompt caching?

Yes, Google offers a 90% discount on cached input tokens, reducing the input price to $0.20 per million for matches.

Gemini 3.1 Pro is Google's flagship reasoning engine, offering an unmatched 2-million token context window.

Input tokens

100,000

50% cached

Output tokens

5,000

per request

Volume

100 / monthly

Standard API

Cost Comparison

Based on 100,000 input tokens (50% cached), 5,000 output tokens, and 100 requests.

Gemini 3.5 Flash

$5.25

Claude Haiku 4.5

$8.00

Gemini 3.1 Pro (<=200k)

$17.00

GPT-5.4

$21.25

Claude Sonnet 4.6

$24.00

Claude Opus 4.7

$40.00

GPT-5.5

$42.50

Open full calculator to adjust tokens, caching, or add other models

How this is calculated

Gemini 3.1 Pro (<=200k) is priced at $2.00 per million input tokens and $12.00 per million output tokens, supporting a 90% caching discount ($0.20 per million) and a 50% batch discount ($1.00 per million inputs, $6.00 per million outputs).

Verdict

Gemini 3.1 Pro provides top-tier intelligence at highly competitive prices. Its 2-million token context window is incredibly powerful when paired with 90% prompt caching.