Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)✓ Catalog verified
Gemini 3.1 Flash Image Preview, 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 contextual understanding with fast, cost-efficient inference, making complex image generation and iterative edits significantly more accessible. Aspect ratios can be controlled with the image_config API Parameter
Overview
Gemini 3.1 Flash Image Preview, 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 contextual understanding with fast, cost-efficient inference, making complex image generation and iterative edits significantly more accessible. Aspect ratios can be controlled with the image_config API Parameter
Access: available through the official Google API. Context window: 66K.
Specifications
| API identifier | google/gemini-3.1-flash-image-preview |
| Provider | |
| Model type | Multimodal LLM |
| Context window | 66K catalog |
| Input modalities | image · text |
| Output modalities | image · text |
| Released | Feb 26, 2026 |
| Tokenizer | Gemini |
| Moderated | No |
| Architecture modality | text+image->text+image |
API defaults
{
"top_k": null,
"top_p": null,
"temperature": null,
"presence_penalty": null,
"frequency_penalty": null,
"repetition_penalty": null
}Pricing
Live pricing components for google/gemini-3.1-flash-image-preview as published in the catalog.
| Pricing component | Raw unit price | Normalized | Unit |
|---|---|---|---|
| Prompt tokens | $5e-7 | $0.50 / 1M | Per input token |
| Completion tokens | $0.000003 | $3.00 / 1M | Per output token |
| Request fee | N/A | N/A | Per request |
| Image fee | N/A | N/A | Per image unit |
| Web search fee | N/A | N/A | Per search request |
Cost calculator
Estimate monthly spend from your own token volumes.
Estimated Total Cost
$0.85Calculated from current list pricing in the ModelsAtlas catalog.Capabilities
| Capability | Status | What it means |
|---|---|---|
| Visual Understanding | ✓ Supported | Image and document analysis support |
| Audio Processing | Not advertised | Speech and voice aligned flows |
| Tool Calling | Not advertised | Supports tools / function calling |
| Self-Hosting | Not advertised | Deploy outside managed APIs |
Capability signals
Directional signals derived from model metadata and capability tags — not official benchmark submissions.
Quick start
Call Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) through an OpenAI-compatible client.
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="YOUR_API_KEY"
)
response = client.chat.completions.create(
model="google/gemini-3.1-flash-image-preview",
messages=[{"role": "user", "content": "Explain quantum physics."}]
)
print(response.choices[0].message.content)Alternatives
Closest models by context window from a different provider.
| Model | Provider | Context | Input /1M | Actions |
|---|---|---|---|---|
| AllenAI: Olmo 3 32B Think | Allenai | 66K | $0.15 | View → |
| AllenAI: Olmo 3 7B Instruct | Allenai | 66K | $0.10 | View → |
Sources & attribution
Pricing and metadata are maintained in the ModelsAtlas catalog.
Frequently asked questions
How much does Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) cost?
$0.50 per 1M input tokens and $3.00 per 1M output tokens on the official Google API.
What is the context window of Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)?
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) supports up to 66K tokens of context.
Does Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) support tool / function calling?
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) does not advertise first-class tool/function calling. Check vendor docs for the latest capabilities.
How do I access Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)?
Use the official Google API with the model id `google/gemini-3.1-flash-image-preview`. See the Quick start section above for code examples.