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GoogleAvailable on AvalAI

Nano Banana 2 (Gemini 3.1 Flash Image) API on AvalAI

gemini-3.1-flash-image

Nano Banana 2 (Gemini 3.1 Flash Image) is an AI model from Google that is available through AvalAI's OpenAI-compatible API.

Open dashboardCompare

Price display scale

Input price$0.50 / 1M tokens

Output price$3.00 / 1M tokens

Context window65,536 tokens

Maximum output32,768 tokens

Release date2026-06-18

Use Nano Banana 2 (Gemini 3.1 Flash Image) with the AvalAI API

Keep the API key in an environment variable and send requests from server-side code.

Bash

curl https://api.avalai.ir/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $AVALAI_API_KEY" \
  -d '{"model": "gemini-3.1-flash-image", "messages": [{"role": "user", "content": "Give a concise, practical solution."}]}'

Python

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["AVALAI_API_KEY"],
    base_url="https://api.avalai.ir/v1",
)

response = client.chat.completions.create(
    model="gemini-3.1-flash-image",
    messages=[{"role": "user", "content": "Give a concise, practical solution."}],
)

print(response.choices[0].message.content)

JavaScript

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.AVALAI_API_KEY,
  baseURL: "https://api.avalai.ir/v1",
});

const response = await client.chat.completions.create({
  model: "gemini-3.1-flash-image",
  messages: [{ role: "user", content: "Give a concise, practical solution." }],
});

console.log(response.choices[0].message.content);

Create an API keyRead the quickstart

Capabilities and endpoints

• Prompt caching
• Structured output
• System messages
• Vision
• Web search

Endpoints

• /v1/chat/completions
• /v1/completions
• /v1/batch

Third-party model parameters

Third-party reference data does not change AvalAI endpoint support; use the capabilities and endpoints above.

• include_reasoning
• max_tokens
• reasoning
• reasoning_effort
• response_format
• seed
• structured_outputs
• temperature
• top_p

Supplemental reasoning effort values

high, minimal

Nano Banana 2 (Gemini 3.1 Flash Image) rate limits

Tier	RPM	TPM
Tier 1	5	100,000
Tier 2	15	250,000
Tier 3	25	450,000
Tier 4	50	800,000
Tier 5	500	1,000,000

AvalAI and reference marketplace pricing

Token role	AvalAI final price0% platform fee	OpenRouter cost breakdown
		Model rate	Credit purchase fee	Effective OpenRouter cost after fee
Input price	$0.50 / 1M tokens	$0.50 / 1M tokens	5.5%	$0.53 / 1M tokens
Output price	$3.00 / 1M tokens	$3.00 / 1M tokens	5.5%	$3.17 / 1M tokens

AvalAI pricing is final with a 0% platform fee. The effective OpenRouter prices add its 5.5% credit purchase fee to the highest reported model rate, including long-context tiers. OpenRouter charges a 5.5% fee when credits are purchased ($0.80 minimum), so small credit purchases can have a higher effective cost. OpenRouter FAQ

Third-party model data

Source: OpenRouter

Independent sources supplement this context; AvalAI remains authoritative for pricing, availability, and endpoint support.

Reviewed snapshot 2026-07-31 · This snapshot was checked more than 14 days ago.

Provider count

—

Context window range

131,072

Maximum output range

32,768

OpenRouter model input rate range

$0.5 / 1M

OpenRouter model output rate range

$3 / 1M

OpenRouter fee

5.5% credit purchase fee · OpenRouter fee details

Effective input price range after fee

$0.5275 / 1M

Effective output price range after fee

$3.165 / 1M

Related models

• Nano Banana 2 (Gemini 3.1 Flash Image Preview)
• gemini-3.1-flash-tts-preview
• Gemini 3.1 Flash Lite Preview
• Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)

Frequently asked questions

What is the Nano Banana 2 (Gemini 3.1 Flash Image) API on AvalAI?

Create an AvalAI API key and send the model ID gemini-3.1-flash-image to one of the supported endpoints shown on this page.

How much does the Nano Banana 2 (Gemini 3.1 Flash Image) API cost on AvalAI?

The Nano Banana 2 (Gemini 3.1 Flash Image) API on AvalAI costs $0.50 per 1M input tokens and $3.00 per 1M output tokens.

What is the token cost for Nano Banana 2 (Gemini 3.1 Flash Image)?

Current AvalAI pricing for Nano Banana 2 (Gemini 3.1 Flash Image) is $0.50 / 1M tokens for input and $3.00 / 1M tokens for output.

What is the Nano Banana 2 (Gemini 3.1 Flash Image) context window?

The recorded maximum input context for Nano Banana 2 (Gemini 3.1 Flash Image) is 65,536 tokens.

What are the rate limits for Nano Banana 2 (Gemini 3.1 Flash Image) on AvalAI?

On tier 5, Nano Banana 2 (Gemini 3.1 Flash Image) on AvalAI supports up to 500 requests per minute and 1,000,000 tokens per minute.

What features does Nano Banana 2 (Gemini 3.1 Flash Image) support on AvalAI?

Nano Banana 2 (Gemini 3.1 Flash Image) on AvalAI supports Prompt caching, Structured output, System messages, Vision, Web search.

What account tier is required to use Nano Banana 2 (Gemini 3.1 Flash Image) on AvalAI?

Calling Nano Banana 2 (Gemini 3.1 Flash Image) on AvalAI requires tier 1 or higher.

Third-party data and freshness

• Pricing, availability, endpoints, and rate limits: AvalAI structured data (authoritative)
• OpenRouter marketplace · Last checked: 2026-07-31