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Long context

Gemini 3.1 Pro Preview · Vertex API pricing

Google's Gemini series — very long context windows and strong multimodal input.

Model IDvertex/gemini-3.1-pro-preview
ChatStreamingTool callingVision
Get API KeyRun your first request

Call summary

Input
$2.00$1.50/ 1M tokens
Cache write $1.50
Cache read $0.15
Output
$12.00$9.00/ 1M tokens
Context Window
1.05M
API Endpoints
1

Gemini 3.1 Pro Preview · Vertex API endpoints

One API key — this model is served on the endpoint below.

POST/v1/chat/completionsOpenAI-compatible · Works for every model
Chat Completions reference

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More Gemini models on Router One

30 other Gemini models on the same gateway and API key — each page lists endpoints, posted price, and context window.

Gemini 3.1 Flash Lite$0.25 in / $1.50 out per 1M1.05M contextGemini 3.1 Flash Lite Preview$0.25 in / $1.50 out per 1M1.05M contextGemini 3.5 Flash$0.45 in / $2.70 out per 1M1.05M contextGemini 3.5 Flash Lite$0.30 in / $2.50 out per 1M1.05M contextGemini 3.6 Flash$0.45 in / $2.70 out per 1M1.05M contextGemini 3.7 Flash$0.225 in / $1.125 out per 1M1.05M contextGemini 3.8 Flash$0.225 in / $1.125 out per 1M1.05M contextGemini 3 Flash$0.1125 in / $0.675 out per 1M1.05M contextGemini 3 Flash Preview$1.20 in / $8.00 out per 1M1.05M contextGemini 4 Argon$0.84 in / $4.20 out per 1M1.05M contextGemini 4 Carbon$0.84 in / $4.20 out per 1M1.05M contextGemini 3.1 Flash Image Preview$0.50 per imageGemini 3 Pro Image Preview$0.50 per imageGemini Nano Banana 2.1$0.10 per image
16 channel versions
Gemini 3.5 Flash · AI Studio$1.125 in / $6.75 out per 1M1.05M contextGemini 3.5 Flash Lite · AI Studio$0.225 in / $1.875 out per 1M1.05M contextGemini 3.6 Flash · AI Studio$1.125 in / $6.75 out per 1M1.05M contextGemini 3.7 Flash · AI Studio$0.5625 in / $2.8125 out per 1M1.05M contextGemini 3.8 Flash · AI Studio$0.5625 in / $2.8125 out per 1M1.05M contextGemini 4 Argon · AI Studio$1.50 in / $7.50 out per 1M1.05M contextGemini 3.1 Flash Lite · Vertex$0.1875 in / $1.125 out per 1M1.05M contextGemini 3.1 Flash Lite Preview · Vertex$0.1875 in / $1.125 out per 1M1.05M contextGemini 3.5 Flash · Vertex$1.125 in / $6.75 out per 1M1.05M contextGemini 3.5 Flash Lite · Vertex$0.225 in / $1.875 out per 1M1.05M contextGemini 3.6 Flash · Vertex$1.125 in / $6.75 out per 1M1.05M contextGemini 3.7 Flash · Vertex$0.5625 in / $2.8125 out per 1M1.05M contextGemini 3.8 Flash · Vertex$0.5625 in / $2.8125 out per 1M1.05M contextGemini 3 Flash Preview · Vertex$0.375 in / $2.25 out per 1M1.05M contextGemini 4 Argon · Vertex$1.50 in / $7.50 out per 1M1.05M contextGemini 4 Carbon · Vertex$1.50 in / $7.50 out per 1M1.05M context

Gemini 3.1 Pro Preview · Vertex at a glance

Gemini 3.1 Pro Preview · Vertex (model ID vertex/gemini-3.1-pro-preview) is a Gemini-series text model on Router One. Gemini 3.1 Pro Preview · Vertex is sold on the Vertex sales channel: a separately priced product with an isolated routing pool — requests never fall back to the default channel, its rates and long-context tiers are its own, a plan quota covers it only when the live plan response lists the channel id, and the response model field and Dashboard → Logs carry the channel id. No Router One subscription plan includes Gemini 3.1 Pro Preview · Vertex today; every call bills the wallet at its posted rate. Posted rate: $1.50 in / $9.00 out per 1M tokens (was $2.00 in / $12.00 out). Context window: 1.05M tokens. Accepts text, image; returns text. Endpoint: POST /v1/chat/completions (OpenAI-compatible).

Gemini 3.1 Pro Preview · Vertex FAQ

How much does Gemini 3.1 Pro Preview · Vertex cost on Router One?

Gemini 3.1 Pro Preview · Vertex is billed per token on Router One: $1.50 in / $9.00 out per 1M tokens, pay as you go.

Is Gemini 3.1 Pro Preview · Vertex included in Router One subscriptions?

No Router One subscription plan includes Gemini 3.1 Pro Preview · Vertex today; every call bills the wallet at its posted rate.

Which endpoints serve Gemini 3.1 Pro Preview · Vertex?

Gemini 3.1 Pro Preview · Vertex is served on POST /v1/chat/completions (OpenAI-compatible). Any Router One API key works there.

What is Gemini 3.1 Pro Preview · Vertex's context window?

Gemini 3.1 Pro Preview · Vertex accepts up to 1.05M tokens of context per request on Router One.

What does the vertex/ prefix in vertex/gemini-3.1-pro-preview mean?

vertex/ selects the Vertex sales channel on Router One: a separately priced product whose routing stays inside the Vertex channel and never falls back to the default channel, with posted rates and tiers of its own, plan quota only when the live plan response lists the channel id, and the channel id echoed in the response and in every request trace. Router One publishes the channel label and the customer price, not the suppliers or regions behind it; the channel model ids guide on the blog states the full rules. No Router One subscription plan includes Gemini 3.1 Pro Preview · Vertex today; every call bills the wallet at its posted rate.

Start using Gemini 3.1 Pro Preview · Vertex

Create an API key and call Gemini 3.1 Pro Preview · Vertex at $1.50 in / $9.00 out per 1M tokens on Router One — pay as you go, with per-request cost and latency visibility.

Get API KeyPlans & pay-as-you-go pricingCompare models side by sideQuickstart guideChannel model ids guide