Nano Banana 2 (Gemini 3.1 Flash Image)
GoogleReleased Jun 18, 2026
Gemini 3.1 Flash Image, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines advanced...
- Context window
- 131K tokens
- Max output
- 33K tokens
- Input
- image, text
- Output
- image, text
- Tokenizer
- Gemini
- Released
- Jun 18, 2026
- Reasoning
- optional
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $0.500 | $0.015 | $0.515 |
| Output | $3.00 | $0.090 | $3.09 |
Supported parameters
- include_reasoning
- max_tokens
- reasoning
- response_format
- seed
- structured_outputs
- temperature
- top_p
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model google/gemini-3.1-flash-image.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "google/gemini-3.1-flash-image",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="google/gemini-3.1-flash-image",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "google/gemini-3.1-flash-image",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does Nano Banana 2 (Gemini 3.1 Flash Image) cost via API?
- Through OpenKey, Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.515 per 1M input tokens and $3.09 per 1M output tokens. That is the provider price ($0.500 / $3.00) plus a flat 3% fee — nothing else.
- What is Nano Banana 2 (Gemini 3.1 Flash Image)'s context window?
- Nano Banana 2 (Gemini 3.1 Flash Image) accepts up to 131K tokens of context and returns up to 33K tokens per request.
- Is Nano Banana 2 (Gemini 3.1 Flash Image) OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-3.1-flash-image" using any OpenAI SDK — only the base URL and API key change.
- What inputs does Nano Banana 2 (Gemini 3.1 Flash Image) support?
- Nano Banana 2 (Gemini 3.1 Flash Image) accepts image, text input and produces image, text output.
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