The top-quality tier of Imagen 4
It delivers the most detail and texture fidelity in the family, aimed at brand-critical and professional marketing work rather than quick drafts.
Image by Google
Imagen 4 Ultra API
Google DeepMind's highest-fidelity tier in the Imagen 4 family (May 2025), built for final, production-ready assets where maximum detail and strict prompt adherence matter most.
Integrate Imagen 4 Ultra with a single API call — one key, one unified endpoint, and shared billing across every model on Apiframe.
model: "imagen-4-ultra" 
What's special about Imagen 4 Ultra
The strictest prompt adherence
It produces highly aligned results, following detailed and demanding prompts more faithfully than the Standard and Fast tiers.
Native 2K resolution
It generates crisp 2048x2048 output, giving the headroom needed for print, large-format, and high-detail compositions.
Exceptional handling of people
It renders skin tones, facial features, and lighting with particular care, which suits commercial work where authenticity is essential.
The strongest text rendering in the family
It carries Imagen 4's typography improvements furthest, keeping dense or stylized text clean and legible.
Built-in watermarking and controls
Every output includes Google's invisible SynthID watermark, with configurable safety settings and an optional prompt rewriter.
Made with Imagen 4 Ultra
A few outputs generated through the Imagen 4 Ultra API on Apiframe.
A photorealistic beauty close-up of a model with natural skin texture, soft studio lighting, fine detail.
A luxury watch on black velvet, dramatic side lighting, razor-sharp reflections.
A magazine-quality food shot of a sliced citrus tart, glossy glaze, crumbs on slate.
A premium brand poster reading 'AURUM' in elegant gold serif type on deep navy.
A hyperreal portrait of an elderly craftsman in his workshop, warm window light, detailed hands.
An editorial fashion shot of a model in a flowing red gown on a marble staircase, sharp fabric texture.
Overview
- Endpoint
- POST /v2/images/generate
- Model ID
- imagen-4-ultra
- Params key
- imagenParams
- Modality
- Image
- Provider
- Avg. completion
- ~25s
Capabilities
Aspect ratios1:1, 9:16, 16:9, 3:4, 4:3
Avg. time~25s
Quick start
Send a single POST /v2/images/generate request with your API key to
generate with Imagen 4 Ultra. The call returns a jobId you can poll or
receive via webhook.
curl -X POST https://api.apiframe.ai/v2/images/generate \
-H "X-API-Key: afk_your_api_key_here" \
-H "Content-Type: application/json" \
-d '{
"prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
"model": "imagen-4-ultra",
"imagenParams": {
"image_size": "1K",
"output_format": "jpg"
}
}'import requests
response = requests.post(
"https://api.apiframe.ai/v2/images/generate",
headers={
"X-API-Key": "afk_your_api_key_here",
"Content-Type": "application/json",
},
json={
"prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
"model": "imagen-4-ultra",
"imagenParams": {
"image_size": "1K",
"output_format": "jpg"
}
},
)
print(response.json()) # { "jobId": "...", "status": "QUEUED" }const response = await fetch("https://api.apiframe.ai/v2/images/generate", {
method: "POST",
headers: {
"X-API-Key": "afk_your_api_key_here",
"Content-Type": "application/json",
},
body: JSON.stringify({
"prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
"model": "imagen-4-ultra",
"imagenParams": {
"image_size": "1K",
"output_format": "jpg"
}
}),
});
const { jobId } = await response.json();
console.log(jobId);Response & job lifecycle
Generation is asynchronous. A successful submission returns 202 Accepted with a jobId. Poll GET /v2/jobs/{id} (or supply a webhook_url) until the status is COMPLETED; the result field then holds the output URL(s).
1. Submission response (202)
{
"jobId": "b2c3d4e5-f6a7-8901-bcde-f23456789012",
"status": "QUEUED"
}2. Poll for the result
curl https://api.apiframe.ai/v2/jobs/JOB_ID \
-H "X-API-Key: afk_your_api_key_here"import requests, time
while True:
job = requests.get(
"https://api.apiframe.ai/v2/jobs/JOB_ID",
headers={"X-API-Key": "afk_your_api_key_here"},
).json()
if job["status"] in ("COMPLETED", "FAILED"):
break
time.sleep(2)
print(job["result"])let job;
do {
await new Promise((r) => setTimeout(r, 2000));
job = await fetch("https://api.apiframe.ai/v2/jobs/JOB_ID", {
headers: { "X-API-Key": "afk_your_api_key_here" },
}).then((r) => r.json());
} while (job.status !== "COMPLETED" && job.status !== "FAILED");
console.log(job.result);Input schema
Request parameters accepted by the Imagen 4 Ultra endpoint. Model-specific options are nested under the params object shown below.
| Parameter | Type | Required | Default | Allowed / range | Description |
|---|---|---|---|---|---|
| prompt | string | required | — | — | Text description of what to generate. |
| model | string | required | "imagen-4-ultra" | "imagen-4-ultra" | The model identifier for this endpoint. |
| imagenParams.image_size | string | optional | "1K" | "1K", "2K" | Resolution |
| imagenParams.output_format | string | optional | "jpg" | "jpg", "png" | Output format |
Frequently Asked Questions
Common questions about the Imagen 4 Ultra API.
What is Imagen 4 Ultra?
The highest-quality tier of Google's Imagen 4 family, released in May 2025 and built for final, production-grade images.
How is it different from Imagen 4 and Imagen 4 Fast?
Ultra offers the most detail and the strictest prompt adherence, priced at 11 credits ($0.11) per image versus 7 credits ($0.07) for Standard and 4 credits ($0.04) for Fast.
What resolution does it produce?
Native 2K, at 2048x2048.
What is it best for?
Brand-critical marketing, professional commercial assets, and realistic imagery of people.
Does it watermark generated images?
Yes. Every image carries Google's invisible SynthID watermark.
Where can you access it?
Through Apiframe, as well as the Gemini API, Google AI Studio, and Vertex AI.
Still have questions?
Start building with the Imagen 4 Ultra API
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