Image Generation & Editing

Generate or edit images through ClawRouter. Payment is automatic via x402.

Shortcuts:

Slash: /cr-imagegen <prompt> [--model=<alias>] [--size=1024x1024] [--n=1] (/imagegen still accepted in chat for backward compatibility)
Partner tool: blockrun_image_generation (LLM-callable) / blockrun_image_edit (inpainting)

Generate an Image

POST to http://localhost:8402/v1/images/generations:

{
  "model": "google/nano-banana",
  "prompt": "a golden retriever surfing on a wave",
  "size": "1024x1024",
  "n": 1
}

Response:

{
  "created": 1741460000,
  "data": [{ "url": "http://localhost:8402/images/abc123.png" }]
}

Display inline: ![generated image](http://localhost:8402/images/abc123.png)

Model Selection

| Alias | Full ID | Price | Sizes | Best for | | ------------------ | ---------------------------- | ------------ | ------------------------------- | ------------------------------------------------------------------------------------------------------------------ | | nano-banana | google/nano-banana | $0.05 | 1024×1024 | Default — fast, cheap, good quality | | banana-2 | google/nano-banana-2 | $0.09 | 1024×1024 | Gemini 3.1 Flash imagegen — sharper than nano-banana at 1K | | banana-pro | google/nano-banana-pro | $0.10–$0.15 | 1024×1024, 2048×2048, 4096×4096 | High-res, large format | | gpt-image | openai/gpt-image-1 | $0.02–$0.04 | 1024×1024, 1536×1024, 1024×1536 | Budget option; supports editing | | gpt-image-2 | openai/gpt-image-2 | $0.06–$0.12 | 1024×1024, 1536×1024, 1024×1536 | Photorealistic, reasoning-driven, text rendering (slow — proxy polls up to 5min); legacy dalle alias routes here | | seedream | bytedance/seedream-5-pro | $0.045–$0.09 | up to 2848×1600 / 2304×1728 | Flagship quality, reference-image support | | grok-imagine | xai/grok-imagine-image | $0.02 | 1024×1024 | xAI Grok image style | | grok-imagine-pro | xai/grok-imagine-image-pro | $0.07 | 1024×1024 | Grok high-quality | | cogview | zai/cogview-4 | $0.015–$0.02 | 512×512 to 1440×1440 | Cheapest — Zhipu CogView |

Choosing a model:

Default → nano-banana
"high res" / "large" → banana-pro
"photorealistic" / complex scenes → gpt-image-2
"flagship quality" / reference image → seedream
"budget" / "cheap" → cogview
"editable" / "inpainting" → gpt-image (only edit-capable model)
"artistic" / flexible content → grok-imagine
"grok style" → grok-imagine or grok-imagine-pro

Choosing a size:

Default: 1024x1024 (the only size every model accepts)
Portrait: 1024x1536 (gpt-image / gpt-image-2) or 1728x2304 (seedream)
Landscape: 1536x1024 (gpt-image / gpt-image-2), 1344x768 (cogview), or 2048x1024 / 1280x720 (seedream)
High-res: 2048x2048 / 4096x4096 with banana-pro; 2848x1600 with seedream
The gateway validates size per model BEFORE payment and rejects unknown ones — do not invent sizes outside each model's list above

Edit an Existing Image

POST to http://localhost:8402/v1/images/image2image:

{
  "model": "openai/gpt-image-1",
  "prompt": "make the background a snowy mountain landscape",
  "image": "https://example.com/photo.jpg",
  "size": "1024x1024",
  "n": 1
}

ClawRouter automatically downloads URLs and reads local file paths — pass them directly, no manual base64 conversion needed.

Optional mask field: a second image (URL or path) that marks which areas to edit (white = edit, black = keep).

Response is identical to generation:

{
  "created": 1741460000,
  "data": [{ "url": "http://localhost:8402/images/xyz456.png", "revised_prompt": "..." }]
}

Supported models for editing: openai/gpt-image-1 only ($0.02)

Example Interactions

User: Draw me a cyberpunk city at night → POST to /v1/images/generations, model nano-banana, prompt as given.

User: Generate a high-res portrait of a samurai → POST to /v1/images/generations, model seedream, size 1728x2304.

User: Edit this photo to add a sunset background: https://example.com/portrait.jpg → POST to /v1/images/image2image, model gpt-image, image = the URL, prompt = "add a warm sunset background".

User: Change the background in my image to a beach (attaches local file) → POST to /v1/images/image2image, image = the local file path, prompt describes the change.

Notes

Payment is automatic via x402 — deducted from the user's BlockRun wallet
If the call fails with a payment error, tell the user to fund their wallet at blockrun.ai
Google models may return base64 internally — ClawRouter uploads automatically and returns a hosted URL
OpenAI image models enforce OpenAI content policy; use nano-banana or grok-imagine for more flexibility
Image editing is only available with gpt-image-1; generation supports all listed models