The GPT Image 2 API gives you programmatic access to OpenAI's GPT Image 2 model for high-fidelity text-to-image generation and instruction-based image editing, with prompts up to 20,000 characters and resolution up to 4K, all through one Muapi API key, from $0.025 per image.
Generate high-quality images from text prompts using GPT Image 2, supporting up to 20,000-character prompts for detailed and precise image creation, up to 4K resolution.
Transform and edit existing images using GPT Image 2 with text instructions. Supports up to 16 input images for precise style transfer, editing, and image transformation.
The GPT Image 2 API gives applications programmatic access to OpenAI's GPT Image 2 model. Submit a detailed text prompt — up to 20,000 characters — and get back a high-fidelity image at resolution up to 4K, or provide up to 16 reference images and an editing instruction to transform an existing image.
Muapi exposes both GPT Image 2 endpoints through one REST API. Use the image playground to compare GPT Image 2 against Nano Banana Pro, Seedream, and every other image model in the catalog.
Describe a scene in up to 20,000 characters for precise, detailed control over composition and content.
Generate images at 1K, 2K, or 4K resolution, with quality tiers to trade off cost against fidelity.
Transform an existing image with a text instruction instead of masks or manual selection.
Supply up to 16 input images for style transfer, composition, and precise transformation.
Choose from 10 aspect ratio presets, from square to ultra-wide and portrait formats.
Submit a request, store the request ID, and poll the shared result endpoint — no OpenAI account or ChatGPT session required.
| Endpoint | Input | Output | Price | Best For |
|---|---|---|---|---|
| gpt-image-2-text-to-image | Prompt (up to 20,000 chars) | 1K–4K image | $0.025–$0.15/image | New images from a detailed text description |
| gpt-image-2-image-to-image | Prompt + up to 16 images | 1K–4K image | $0.025–$0.15/image | Editing or transforming an existing image |
Price scales with the requested quality (low/medium/high) and resolution (1K/2K/4K). Review the live Playground schema for the full cost table before shipping in production.
Submit a JSON request with your Muapi API key, save the request ID, and poll the shared result endpoint. Provide publicly reachable image URLs for the editing endpoint.
curl -X POST https://api.muapi.ai/api/v1/gpt-image-2-text-to-image \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"A luxury watch on a marble surface, dramatic studio lighting, product photography","aspect_ratio":"1:1","resolution":"2K","quality":"high"}'
# Response: {"request_id":"REQUEST_ID"}Call gpt-image-2-text-to-image with a prompt, aspect ratio, resolution, and quality.
curl -X POST https://api.muapi.ai/api/v1/gpt-image-2-image-to-image \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Change the background to a rain-soaked city street at night","images_list":["https://example.com/reference.jpg"],"aspect_ratio":"1:1","resolution":"2K","quality":"high"}'
# Response: {"request_id":"REQUEST_ID"}Call gpt-image-2-image-to-image with a prompt, up to 16 reference image URLs, and the same resolution/quality controls.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY" # Poll until status is completed, then read the generated image URL from outputs.
Poll until the task is completed, then read the returned image URL from outputs.
Up to 20,000 characters, for both the text-to-image and image-to-image endpoints — long enough for detailed, multi-part scene descriptions.
1K, 2K, and 4K. Note that a 1:1 aspect ratio cannot be converted to 4K, and images left at the default "auto" aspect ratio are only available at 1K.
Yes. gpt-image-2-image-to-image accepts up to 16 input images plus a text instruction describing the desired transformation.
Price depends on quality (low/medium/high) and resolution (1K/2K/4K), ranging from $0.025 per image (low quality, 1K) to $0.15 per image (high quality, 4K).
No. Muapi exposes GPT Image 2 as standard asynchronous REST endpoints. Create a Muapi API key, submit JSON, and poll the returned request ID.
auto, 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 5:4, and 4:5.
Create one Muapi API key and connect text-to-image generation and instruction-based editing in a single asynchronous workflow.