Nano Banana 2 Now Available via API

Date: 2026-02-27 Version: OpenClaw 2026.2.26

Google launched Nano Banana 2 today (gemini-3.1-flash-image-preview), the Flash-speed successor to Nano Banana Pro. It's available immediately via the Gemini API with the same key.

Curl examples

Nano Banana Pro (original):

curl -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3-pro-image-preview:generateContent?key=$GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"your prompt"}]}],"generationConfig":{"responseModalities":["TEXT","IMAGE"]}}'

Nano Banana 2:

curl -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent?key=$GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"your prompt"}]}],"generationConfig":{"responseModalities":["TEXT","IMAGE"]}}'

Pricing

NB2 also adds a 0.5K tier at $0.045, not available on Pro. Quality-wise: NB2 is faster and significantly cheaper. Pro still wins on realism and fine detail, but NB2 holds its own for everyday use.

OpenClaw nano-banana-pro skill

The bundled nano-banana-pro skill in OpenClaw still uses gemini-3-pro-image-preview. If you want to switch it to NB2 locally, it's a one-line change in the script:

<openclaw>/skills/nano-banana-pro/scripts/generate_image.py

- model="gemini-3-pro-image-preview",
+ model="gemini-3.1-flash-image-preview",

Note: this change will be overwritten next time you update OpenClaw.