AI Image Generation API
Generate, edit, upscale, and remove backgrounds with Flux, Midjourney, Ideogram, GPT Image, and Imagen through one API.
- 57
- Image models
- —
- Below official
- 14s
- Median latency
Image gallery
Portrait
Macaw
Everything the image endpoint can do
Text to Image
One prompt, one call. Size, style, and batch count are plain parameters on the same endpoint.
Image Editing
Instruction-based edits on an existing image - change a material, a color, or a whole background.
Inpainting
Mask a region and regenerate only that area, keeping the rest of the frame pixel-identical.
Image models on one key
Flux/flux-2-klein
Black Forest Labs
$0.03 / image
Flux/flux-dev
Black Forest Labs
$0.06 / image
Flux/flux-pro
Black Forest Labs
$0.07 / image
Flux 2/flux-2-flex-remix-image
Black Forest Labs
$0.14-$0.24 / image
Flux 2/flux-2-flex-text-to-image
Black Forest Labs
$0.14-$0.24 / image
Flux 2/flux-2-max-remix-image
Black Forest Labs
$0.15 / image
Flux 2/flux-2-max-text-to-image
Black Forest Labs
$0.15 / image
Flux 2/flux-2-pro-remix-image
Black Forest Labs
$0.06-$0.07 / image
Generate an image
curl https://runapi.ai/api/v1/flux/text_to_image \
-H "Authorization: Bearer $RUNAPI_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"flux-2-klein","prompt":"A cobalt vase on white marble."}'Four Steps to Your First Generation
-
Get Your API Key
One key for all 57 image models.
-
Choose a Model
Flux, Midjourney, GPT Image, Ideogram, Recraft — pick by style or speed.
-
Send a Request
POST to /api/v1/flux/text_to_image. We route to the best provider at the lowest price.
-
Download Result
Response includes a CDN URL. Images typically ready in 3-15 seconds.
Why Developers Choose RunAPI
One Key, All Models
Stop juggling API keys. One integration gives you access to 57 image models across all providers.
15-25% Cost Savings
Our volume agreements with providers mean lower prices than going direct. No markup on top.
Automatic Failover
If a provider goes down, we route to the next best option. Your app stays up.
OpenAI-Compatible
Drop-in replacement for OpenAI SDK. Change one line of code to access any model.
Real-Time Billing
Pay only for what you use. Per-request pricing with no minimums. Track costs per model, per project.
Data Privacy
Our Privacy Policy explains how request data and generated content are processed and retained.
What teams build with it
Product Catalogs
Generate on-brand shots for thousands of SKUs, then cut backgrounds in the same pipeline.
Ad Creative
Batch variants per channel and aspect ratio. Swap models without touching request code.
App Features
Ship avatar, sticker, or thumbnail generation as a product feature with per-key spend caps.
Design Systems
Keep a series consistent with image-to-prompt, then iterate with masked inpainting.
RunAPI vs alternatives
| Feature | RunAPI | Direct API | Replicate |
|---|---|---|---|
| Image models | 57 | 1 provider | ~20 |
| Pricing | 15-25% below official | Official rate | Market rate + GPU markup |
| Response time | 3-15s typical | Varies | Cold start delays |
| Unified billing | ✓ | ✗ | ✓ |
| MCP server | ✓ | ✗ | ✗ |
| Provider failover | ✓ | ✗ | ✗ |
Image API questions
How is image generation billed?
Per image or per megapixel, depending on the model. The catalog lists the exact unit next to each price.
Can I edit an image I already have?
Yes. Pass your image with task_type image_edit or inpaint, plus an instruction or a mask.
Is Midjourney really available over API?
Yes, through RunAPI's managed integration. It uses the same request shape as every other image model.
What is the maximum resolution?
Native resolution depends on the selected model; dedicated upscalers can produce 4K output where supported.
Do you keep my images?
Output retention follows the active endpoint contract. RunAPI does not use prompts or outputs for training.
Can I set a per-project spend limit?
Yes. Create a separate API key per project and set its available credit and reset cycle.
Add image generation to your product
57 models behind one OpenAI-shaped request. Start free, no credit card required.