Nano Banana (Gemini 2.5 Flash Image)
GoogleReleased Oct 7, 2025
Gemini 2.5 Flash Image, a.k.a. "Nano Banana," is now generally available. It is a state of the art image generation model with contextual understanding. It is capable of image generation,...
- Context window
- 33K tokens
- Max output
- 33K tokens
- Input
- image, text
- Output
- image, text
- Tokenizer
- Gemini
- Knowledge cutoff
- Jan 31, 2025
- Released
- Oct 7, 2025
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 | $0.300 | $0.0090 | $0.309 |
| Output | $2.50 | $0.075 | $2.58 |
| Cache read | $0.030 | $0.0009 | $0.031 |
| Cache write | $0.083 | $0.0025 | $0.086 |
Benchmarks
Design Arena
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| graphicdesignmodels | 1204 | 56.9% | #8 |
| imagemodels | 1214 | 55.6% | #8 |
| logomodels | 1189 | 51.5% | #9 |
Head-to-head preference voting. How we filter and rank
Supported parameters
- max_tokens
- response_format
- seed
- stop
- structured_outputs
- temperature
- top_p
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model google/gemini-2.5-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-2.5-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-2.5-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-2.5-flash-image",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does Nano Banana (Gemini 2.5 Flash Image) cost via API?
- Through OpenKey, Nano Banana (Gemini 2.5 Flash Image) costs $0.309 per 1M input tokens and $2.58 per 1M output tokens. That is the provider price ($0.300 / $2.50) plus a flat 3% fee — nothing else.
- What is Nano Banana (Gemini 2.5 Flash Image)'s context window?
- Nano Banana (Gemini 2.5 Flash Image) accepts up to 33K tokens of context and returns up to 33K tokens per request.
- Is Nano Banana (Gemini 2.5 Flash Image) OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-2.5-flash-image" using any OpenAI SDK — only the base URL and API key change.
- What inputs does Nano Banana (Gemini 2.5 Flash Image) support?
- Nano Banana (Gemini 2.5 Flash Image) accepts image, text input and produces image, text output. Its knowledge cutoff is Jan 31, 2025.
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