GoogleImage generationImagen 4 Fast API: Google Vertex (Gemini + Imagen)'s image-generation model, one key away
Imagen 4 Fast via the ApexApi gateway
The fast Imagen 4 tier at a third of Ultra's price. Built for iteration: generate many, promote the good ones. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. Pricing is $0.030/image per image, billed pay-per-use from your credit balance with no subscription.
Imagen 4 Fast is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: Google Vertex (Gemini + Imagen).
Why Imagen 4 Fast
Text-to-image generation
High-quality image generation (and image-to-image where supported) through one API.
Transparent pricing ($0.030/image)
Pay per image from your credit balance. Failed generations aren't billed.
OpenAI-compatible
Drop-in with any OpenAI SDK. Change the base URL and key, keep your code.
Specifications
- Modality
- image
- Context window
- —
- Max output
- —
- Streaming
- Yes
- Tool / function calling
- —
- Vision input
- —
Imagen 4 Fast pricing
- That makes it the 7th cheapest of the 29 image models we serve, ranked on output price.
Getting started with Imagen 4 Fast
OpenAI-compatible. Point your client at ApexApi, swap your key, and call it. No new SDK to learn.
import requests
resp = requests.post(
"https://api.apexapi.dev/v1/images/generations",
headers={"Authorization": "Bearer <YOUR_APEXAPI_KEY>"},
json={"model": "imagen-4-fast", "prompt": "A serene mountain lake at golden hour"},
)
print(resp.json())Imagen 4 Fast use cases
What teams build with Imagen 4 Fast on ApexApi.
Marketing & creative
On-brand visuals, ad creative, and product imagery at scale.
In-product generation
Generate images inside your app from user prompts.
Prototyping
Rapid concept art and design exploration.
Imagen 4 Fast vs other models
How it compares, and on ApexApi you can switch between any of them with a single string change, same key, same endpoint.
Imagen 4 Fast vs Nano Banana Pro
Compare Imagen 4 Fast against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Nano Banana Pro API →Imagen 4 Fast vs FLUX.2 Pro
Compare Imagen 4 Fast against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about FLUX.2 Pro API →Imagen 4 Fast API: FAQ
How do I call Imagen 4 Fast through ApexApi?
Create an ApexApi key, point your client at https://api.apexapi.dev/v1, and POST to /v1/images/generations with the model set to `imagen-4-fast`. The API is OpenAI-compatible, so an existing OpenAI SDK works once you change the base URL and key.
How much does Imagen 4 Fast cost on ApexApi?
$0.030/image, billed per image with no subscription or minimum. The exact figure is shown before you generate, so nothing is charged against a price you have not seen.
Ready to build with Imagen 4 Fast?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start