GoogleImage generationImagen 3 Fast API: Google Vertex (Gemini + Imagen)'s image-generation model, one key away
Imagen 3 Fast via the ApexApi gateway
Imagen 3 Fast is a image-generation model from Google Vertex (Gemini + Imagen). 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 3 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 3 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 3 Fast pricing
Pay-per-use. No subscription, no minimums. Buy credits and pay only for what you call. Transparent, per-call pricing across every model.
Getting started with Imagen 3 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-3-fast", "prompt": "A serene mountain lake at golden hour"},
)
print(resp.json())Imagen 3 Fast use cases
What teams build with Imagen 3 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 3 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 3 Fast vs Nano Banana Pro
Compare Imagen 3 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 3 Fast vs FLUX.2 Pro
Compare Imagen 3 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 →Why build on ApexApi
One API, every model
OpenAI-compatible. Swap the base URL and key, keep your code. Call 14+ providers and hundreds of models through a single integration.
Smart routing & failover
Per-model provider chains with automatic failover. If one provider degrades, requests route to the next. Your app stays up.
Pay-per-use, no lock-in
Buy credits, pay only for what you call. No subscriptions, no minimums. Switch models anytime with a single string change.
Imagen 3 Fast API: FAQ
How do I use the Imagen 3 Fast API?
Create an ApexApi key, then point your client at https://api.apexapi.dev/v1 and use the model slug. POST to /v1/images/generations with the model slug and a prompt.
Is the Imagen 3 Fast API OpenAI-compatible?
Yes. ApexApi exposes Imagen 3 Fast through the same OpenAI-compatible interface used across the whole catalog. Swap the base URL and API key and keep your existing code.
How much does Imagen 3 Fast cost on ApexApi?
Pay-per-use. See the live price in the Pricing section above. There's no subscription or minimum; you buy credits and pay only for what you call.
Can I switch from Imagen 3 Fast to another model later?
Yes. Change a single string (the model slug) to call any other model in the catalog through the same endpoint and key. No re-integration.
Ready to build with Imagen 3 Fast?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start