Last updated 07-29-2026
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Kie.ai - 4o Image API
Kie.ai - 4o Image API is a developer image generation API that exposes OpenAI's GPT-Image-1 model through Kie.ai's gateway at api.kie.ai. You send text prompts or source images over REST and receive generated or edited visuals, with a browser playground on the product page for testing before integration. The model is pitched as ChatGPT 4o Image and targets workflows where prompts, layout, and readable text matter.
Kie.ai prices calls on a flat credit system rather than OpenAI's token-based image billing. A single-image generation costs 6 credits, about $0.03, with no subscription required and credit top-ups starting at $5. That trade-off favors predictable per-call costs over running your own GPU stack or decoding OpenAI's output token math.
The API fits product teams, marketers, and app builders who need instruction-following generation, legible text in images, and style consistency across batches. Kie.ai documents use cases such as product mockups, labeled infographics, Ghibli-style art, and keeping characters consistent across scenes.
Single-image API calls cost 6 credits, about $0.03 per generation
Output aspect ratios are limited to 1:1, 3:2, and 2:3
Each request can return 1, 2, or 4 variants through the nVariants parameter
Image-to-image uploads accept PNG, JPG, and WEBP files in the playground
Async jobs return a task ID polled through the /record-info endpoint
Flat per-call pricing at about $0.03 per single image with no subscription
Supports text-to-image, masked editing, and multi-variant outputs in one API
Readable text rendering and style consistency are core selling points on the product page
Official quickstart docs include curl, JavaScript, and Python examples
Browser playground lets you test prompts before writing integration code
Output sizes are limited to three aspect ratios: 1:1, 3:2, and 2:3
Generation is asynchronous, so apps need polling or callbacks rather than instant responses
You buy Kie.ai credits rather than billing OpenAI directly, which adds a reseller layer
How much does Kie.ai 4o Image API cost?
Kie.ai 4o Image API charges 6 credits per single-image call, about $0.03. Calls that return 2 images cost $0.035 and 4-image calls cost $0.04. Credit top-ups start at $5 with no subscription.
What image sizes does Kie.ai 4o Image API support?
Kie.ai 4o Image API supports three aspect ratios: 1:1, 3:2, and 2:3. You pass the size value in the generate request body alongside your prompt and variant count.
Does Kie.ai 4o Image API support image editing?
Yes. Kie.ai 4o Image API supports image editing by sending filesUrl for source images and an optional maskUrl to limit edited regions. The docs also cover image-to-image variants from an uploaded base image.
How do you authenticate Kie.ai 4o Image API requests?
Kie.ai 4o Image API uses Bearer token authentication. Generate an API key from the Kie.ai API Key page and send it in the Authorization header on requests to https://api.kie.ai.
Can Kie.ai 4o Image API be used commercially?
Yes. The Kie.ai 4o Image API product page labels the model for commercial use, and the docs describe business applications such as product visualization and infographic design.
How does Kie.ai 4o Image API report generation status?
Kie.ai 4o Image API returns a task ID after you submit a job. Poll the /record-info endpoint for progress and final image URLs, or pass a callback URL to receive completion updates automatically.