Gemini 3.1 Pro API Pricing

Short answer

Gemini 3.1 Pro costs $2.00 per 1M input tokens and $12.00 per 1M output tokens . Context window: 1,048,576. Last verified 2026-06-17 from openrouter.ai. Confidence: Auto.

Gemini 3.1 Pro is Google's flagship reasoning model (preview, paid-only) with full multimodal input and a 1M context window.

Input
$2.00 /1M
Output
$12.00 /1M
Cached input
/1M
Input pricing$2.00
Output pricing$12.00

Limits & capabilities

Context window1,048,576
Max output65,536
Modalitytext/image/video/audio/PDF input, text output
ChannelOpenRouter
ProviderGoogle Gemini

Best for

ReasoningAgenticLong context
Prompts over 200K bill $4 input / $18 output. Thinking tokens billed as output. Vertex non-global endpoints add ~10% from Jul 1 2026.

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