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google/gemini-3-1-flash-image
Nano Banana 2 (Gemini 3.1 Flash Image)
Google's fast, high-quality image generation model.
6/18/2026
131,072 tokens
Per image: ¥12.23
Specifications
Modalities
Input
text
image
Output
image
Supported Parameters
include_reasoning
max_tokens
reasoning
reasoning_effort
response_format
seed
structured_outputs
temperature
top_p
Max Output Tokens
32,768Reasoning Configuration
- Default
- Thinking on (effort: minimal)
- Selectable effort levels
- highminimal
- Turning thinking off
- Possible (reasoning.enabled: false)
Code Examples
curl https://api.fastmetal.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "google-nano-banana-2",
"messages": [{"role": "user", "content": "Hello!"}]
}'Images generated by Nano Banana 2 (Gemini 3.1 Flash Image)
Generated on FastMetal from the prompts below — no retouching, no cherry-picking.
Frequently asked questions
- How much does the Nano Banana 2 (Gemini 3.1 Flash Image) API cost?
- On FastMetal, Nano Banana 2 (Gemini 3.1 Flash Image) is billed per generated image in yen: ¥12.23 per image, before tax — not per token. Usage is drawn from a prepaid balance; there is no subscription or monthly fee.
- Can I call Nano Banana 2 (Gemini 3.1 Flash Image) with the OpenAI SDK?
- Yes. Point base_url at https://api.fastmetal.ai/v1 and pass "google-nano-banana-2" as the model; existing OpenAI-style code works unchanged, including streaming, tool calls and structured output.
- What is the context window of Nano Banana 2 (Gemini 3.1 Flash Image)?
- 131,072 tokens, shared between the prompt and the response.
- What do I need to try Nano Banana 2 (Gemini 3.1 Flash Image)?
- Create an account and add credit; the model is then available both in the browser chat and over the API. There is no contract or minimum spend.
Try Nano Banana 2 (Gemini 3.1 Flash Image) right now
Nano Banana 2 (Gemini 3.1 Flash Image) is available on FastMetal through one API key. Start in the browser, or call it from the OpenAI SDK.