Gemini 3.1 Pro

Save 70%

google/gemini-3.1-pro-preview

Gemini 3.1 Pro — Google flagship for advanced math, code, and reasoning.

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Context window: 1M
Max output: 66K
Input modalities: text · image · audio · video
Output modalities: text
Capabilities: Vision · Reasoning · Tool Calling · Json Mode · Coding
RouteMux name: google/gemini-3.1-pro-preview

Live model playground

Try Gemini 3.1 Pro here

Tune the request, see the current price ceiling, and inspect the real response without leaving this model page.

streamchat

1Configure input

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0 / 20,000

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2Live result

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Enter an input on the left. The same RouteMux Playground execution and billing path powers this embedded test.

Gemini 3.1 Pro API pricing

Source: gemini_x0.5 · Verified 2026-06-08

InputOfficial $2 / M tokens

$0.6/ M tokensSave 70%

OutputOfficial $12 / M tokens

$3.6/ M tokensSave 70%

Cache read $0.06/M · Cache write —/M

Tier	Input	Cache read	Cache write	Output
Standard	$0.6$2−70%	$0.06~~$0.2~~−70%	—	$3.6~~$12~~−70%
Standard ≤200K	$0.6$2−70%	$0.06~~$0.2~~−70%	—	$3.6~~$12~~−70%
Standard >200K	$1.2$4−70%	$0.12~~$0.4~~−70%	—	$5.4~~$18~~−70%

Estimate cost

Input tokensOutput tokens

Estimated cost$0.0096

Limited time20% extra Credits on your first top-up — up to 200 bonus Credits

Applies to your first top-up within 72 hours of signing up. Minimum $20, once per account.

Key capabilities

VisionReasoningTool CallingJson ModeCoding

Interface and protocols

OpenAI Chat CompletionsStreaming

Use either ID to call this model via the API.

RouteMux namegoogle/gemini-3.1-pro-preview

You can use these names directly in the request model field.

models/gemini-3.1-pro-preview

Replace the ROUTEMUX_KEY placeholder with your API key. Create one →

from openai import OpenAI

client = OpenAI(
    base_url="https://api.routemux.com/v1",
    api_key="<ROUTEMUX_KEY>",
)

completion = client.chat.completions.create(
    model="google/gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(completion.choices[0].message.content)

base_url: https://api.routemux.com/v1

Performance (last 30 days)

0 requests · last 30 days

Total usage40.37M

P50 first-token latencyInsufficient data (0 requests)

Avg throughputInsufficient data (0 requests)

Success rate100.0%

Uptime · 24htested via openai_chat

100.00%

Gemini 3.1 Pro FAQ

›What is Gemini 3.1 Pro?

Gemini 3.1 Pro — Google flagship for advanced math, code, and reasoning.

›How large is the context window of Gemini 3.1 Pro?

Gemini 3.1 Pro supports a context window of up to 1M tokens, with up to 66K output tokens per request.

›How much does the Gemini 3.1 Pro API cost?

Through RouteMux, Gemini 3.1 Pro costs $0.6 for input and $3.6 for output (USD per 1M tokens), below the official list price.

›How do I call Gemini 3.1 Pro via API?

Gemini 3.1 Pro is OpenAI-compatible: point your base URL at RouteMux and set the model field to google/gemini-3.1-pro-preview — no code changes needed.

›Which input and output modalities does Gemini 3.1 Pro support?

Gemini 3.1 Pro accepts text, image, audio, video as input and produces text as output.

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