Question 1

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

Accepted Answer

Nano Banana 2 (Gemini 3.1 Flash Image) is a model from Google Gemini AI, released on Feb 26, 2026. Gemini 3.1 Flash Image is a Google image-understanding and image-generation model optimized for price-performance balance.

Question 2

How much does Nano Banana 2 (Gemini 3.1 Flash Image) cost?

Accepted Answer

On the Respan gateway, input starts at $0.50 per 1M tokens on every provider, and output starts at $3.00 per 1M tokens on every provider, after gateway discounts.

Question 3

Which providers serve Nano Banana 2 (Gemini 3.1 Flash Image) on Respan?

Accepted Answer

3 providers serve Nano Banana 2 (Gemini 3.1 Flash Image): OpenRouter and Google Vertex AI. Google Vertex AI require your own provider API key (BYOK).

Question 4

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

Accepted Answer

Nano Banana 2 (Gemini 3.1 Flash Image) accepts up to 1.0M tokens of context on its largest provider route.

Question 5

How do I use Nano Banana 2 (Gemini 3.1 Flash Image) with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "gemini-3.1-flash-image". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is Nano Banana 2 (Gemini 3.1 Flash Image)?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 11 tokens per second, and the lowest response latency was 0.8 seconds on OpenRouter. Speed varies with request size and provider.

Provider	Context	Input	Output
OpenRouter`openrouter/google/gemini-3.1-flash-image`	131K	$0.50/M	$3.00/M
Google Vertex AIBYOK only`vertex_ai_beta/gemini-3.1-flash-image-preview`	1.0M	$0.50/M	$3.00/M
Google Vertex AIBYOK only`vertex_ai/gemini-3.1-flash-image-preview`	1.0M	$0.50/M	$3.00/M

Nano Banana 2 (Gemini 3.1 Flash Image)

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Apps