How does Imagen 4 pricing work?

Credit-based: 1 credit equals $0.001 USD. Imagen 4 is a flat 46 credits per request regardless of aspect ratio. The schema fixes n at 1, so total charge equals one image per call. Failed Imagen 4 tasks are refunded automatically — you only pay for successful renders.

What aspect ratios does Imagen 4 support?

Five ratios via the size field: 1:1 (square), 4:3 and 3:4 (editorial), 16:9 and 9:16 (hero / mobile). The default is 16:9. Passing a ratio outside this set returns a 400 — Imagen 4 on reApi rejects unsupported values explicitly so you catch the bad input client-side instead of getting a silent fallback.

Does Imagen 4 support image-to-image?

No. Imagen 4 is text-to-image only — image_urls, mask, and similar reference fields are rejected. For image-to-image with reference fusion, use seedream-5-0-lite (flat per-image, multi-reference) or the gemini-3-pro-image-preview family (multi-tier resolution).

Can I generate multiple images in one Imagen 4 call?

Imagen 4's spec accepts only n = 1 per request. To produce variations, send multiple parallel requests — the async task model is designed for exactly this; each task_id polls independently and the per-image cost is identical.

How long are Imagen 4 output URLs valid?

Image URLs returned by Imagen 4 are valid for 24 hours from completion. For longer retention, download the asset and re-host on your own storage (R2 / S3 / OSS) as soon as your worker receives the completion event.

Where is the full Imagen 4 API reference?

The complete parameter list, validation rules, error codes, and runnable examples for Imagen 4 live at /docs/imagen-4-0.

Imagen 4 API — Google Imagen 4.0 Text-to-Image

Imagen 4.0 is Google's flagship text-to-image model. Five aspect ratios, one flat per-image rate, async-first JSON contract — drop it into the same /api/v1/images/generations endpoint you already use.

Price

est$0.046– $0.046per image

Try Imagen 4.0 View API Docs

Input

Prompt*

English or Chinese · detailed prompts produce better Imagen 4 results

Aspect ratio

1:1 · 4:3 · 3:4 · 16:9 · 9:16 — pick by surface

Count

Fixed at 1 on Imagen 4 — send multiple requests for variations

Result

Try one of these prompts

02use cases

What you can build

Real workflows powered by this model.

01/case

Hero shots at any aspect ratio

Imagen 4 covers the five aspect ratios most product surfaces ship — 1:1 for grid tiles, 16:9 and 9:16 for hero / mobile, 4:3 and 3:4 for editorial. One prompt template, five ratios, one flat rate. The same scene description carries across ratios without recomposition, which keeps a campaign visually consistent across web, app, and social.

Generate a hero

02/case

Editorial and marketing creative

Imagen 4's prompt adherence and lighting handle editorial-grade product photos, marketing banners, and brand moodboards. Describe the subject, the surface, the light, the lens — the render lands with composition you can drop straight into a layout. Async submit returns a task_id in milliseconds so a creative pipeline isn't blocked waiting on render.

03/case

Concept art and ideation

Send Imagen 4 a free-form scene description — a city skyline, a character beat, a landscape under a specific light — and it returns a single high-fidelity frame. Because Imagen 4 is text-to-image only, the result is purely prompt-driven; ideal for early-stage concept work where you haven't picked a reference yet.

03pricing

Pricing

Credit-based — 1 credit = $0.001 USD. Pay only for completed generations.

Mode	Category	Unit	Price
Per image
└	Any aspect ratio	1 image	$0.046 46 credits

05why

Why reAPI

Google Imagen 4 on one endpoint

Imagen 4 ships through the same /api/v1/images/generations endpoint you already use for the rest of your image stack. One JSON shape, one auth header, one credit ledger. Send model: imagen-4-0 with a prompt and a size and the task lands the same way every other reApi image task does.

Flat per-image rate — no hidden tiers

1 credit equals $0.001 USD. Imagen 4 is a flat 46 credits per image regardless of aspect ratio. No quality tier, no resolution tier, no n multiplier — the spec accepts exactly one image per request. The estimator on this page is the actual charge.

Async-first for production stacks

Submit an Imagen 4 task, get a task_id back, poll until done. Failed and moderated requests are not charged. Imagen 4 fits the same task plumbing as every other reApi model — drop it in, the lifecycle is identical.

06quickstart

Integrate Imagen 4 in three steps

step 01
Create an API key
Sign up at reApi and grab a key. Free signup credits cover dozens of Imagen 4 generations, enough to validate the prompt → asset path before topping up.
Open
step 02
Submit a generation
POST to /api/v1/images/generations with model: imagen-4-0, a prompt, and an optional size. Imagen 4 returns a task_id immediately — your handler is free to move on.
Open
step 03
Poll the result
GET /api/v1/tasks/:id until status is completed. The Imagen 4 response carries an image URL valid for 24 hours; mirror to your own storage if you need it longer.
Open

07faq

Frequently asked questions

Common questions about this model.

Imagen 4 is Google's flagship text-to-image model. It renders at five aspect ratios — 1:1, 4:3, 3:4, 16:9, 9:16 — and accepts English or Chinese prompts. On reApi it ships as model id imagen-4-0 on the OpenAI-compatible /api/v1/images/generations endpoint, billed at a flat 46 credits ($0.046) per image.

start building

Ready to ship?

Try it in the playground or grab an API key to integrate now.

Try Imagen 4.0 Get API key

What you can build

Real workflows powered by this model.

01/case