nano-banana-pro-openrouter
Image generation and editing via OpenRouter's Gemini 3 Pro model with multi-image compositing support.
- Supports three workflows: prompt-only generation, single-image editing, and multi-image composition (up to 3 images per request)
- Output resolution options: 1K, 2K, or 4K (defaults to 1K)
- Customizable behavior through optional system prompt template in
assets/SYSTEM_TEMPLATE - Requires
OPENROUTER_API_KEYenvironment variable anduvpackage manager; includes troubleshooting guidance for authentication and dependency issues
Nano Banana Pro OpenRouter
Overview
Generate or edit images with OpenRouter using the google/gemini-3-pro-image-preview model. Support prompt-only generation, single-image edits, and multi-image composition.
Prompt-only generation
uv run {baseDir}/scripts/generate_image.py \
--prompt "A cinematic sunset over snow-capped mountains" \
--filename sunset.png
Edit a single image
uv run {baseDir}/scripts/generate_image.py \
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