GoogleImage generationImagen 4 Ultra API: Google's photorealistic image model
Imagen 4 Ultra via the ApexApi gateway
Imagen 4 Ultra is Google's high-end text-to-image model, focused on photorealistic detail and strong prompt understanding. Generate via ApexApi (served on Google Vertex) with simple per-image pricing.
Imagen 4 Ultra 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 Ultra
Photorealism
High-detail, realistic image generation.
Prompt understanding
Strong adherence to detailed prompts.
Vertex-backed
Served on Google Vertex through ApexApi's unified API.
Specifications
- Modality
- image
- Context window
- —
- Max output
- —
- Streaming
- Yes
- Tool / function calling
- —
- Vision input
- —
Imagen 4 Ultra 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 4 Ultra
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-ultra", "prompt": "A serene mountain lake at golden hour"},
)
print(resp.json())Imagen 4 Ultra use cases
What teams build with Imagen 4 Ultra on ApexApi.
Photoreal visuals
Realistic imagery for marketing and product.
Concept art
High-quality concepts and renders.
Creative tooling
Generation features inside your app.
Imagen 4 Ultra 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 Ultra vs FLUX.2 Pro
FLUX.2 Pro is a versatile high-fidelity generator; Imagen 4 Ultra targets photorealism.
Learn more about FLUX.2 Pro API →Imagen 4 Ultra vs Nano Banana Pro
Nano Banana Pro is editing-friendly; Imagen 4 Ultra is photorealism-focused. Compare on ApexApi.
Learn more about Nano Banana 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 4 Ultra API — FAQ
How do I use the Imagen 4 Ultra 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 4 Ultra API OpenAI-compatible?
Yes. ApexApi exposes Imagen 4 Ultra 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 4 Ultra 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 4 Ultra 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 4 Ultra?
One API key. Every major AI model. Pay only for what you use.
Get your API key — free to start