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, edits, and multi-turn conversations. Aspect ratios can be controlled with the image_config API Parameter
Google: Nano Banana (Gemini 2.5 Flash Image) – Provider Status and Pricing
Providers for Nano Banana (Gemini 2.5 Flash Image)
OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.