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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.

Highlights
Google Imagen 4 · 5 aspect ratios
Best for
Photoreal stills, typography, product art
Input
Text prompt
Output
One image per request
Input

English or Chinese · detailed prompts produce better Imagen 4 results

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

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

Result

Try one of these prompts

What is the Imagen 4.0 API?

Imagen 4.0 is Google's high-fidelity text-to-image model — prompts only, with no reference images and no inpainting masks. Each request takes a prompt of up to 4,000 characters and one of five aspect ratios (1:1, 4:3, 3:4, 16:9, 9:16, default 16:9), returns exactly one image, and is billed at a flat per-image rate.

Imagen 4 sample renders across five aspect ratios

What you can build with this model

Real-world workflows and production use cases you can build and ship with this model.

Imagen 4 hero shot at 16:9

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
Imagen 4 editorial product photo

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.

Imagen 4 concept art landscape

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.

Pricing

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

First test cost
$0.04646 credits

One sample at the cheapest tier (1 image).

Testing budget guide
Add credits
$10
≈ 217 tests
$50
≈ 1086 tests
$100
≈ 2173 tests
ModelCategoryPrice
Per imageAny aspect ratio
$0.046
46 credits · 1 image

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 per-image rate 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.

Integrate Imagen 4 in three steps

  1. 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
  2. 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
  3. 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
docs/api/imagen-4-0

API reference

Drop-in code and the full parameter table.

View full reference
curl -X POST https://reapi.ai/api/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "imagen-4-0",
    "prompt": "A corgi wearing an astronaut helmet on the lunar surface",
    "size": "16:9"
  }'

Parameter validation failed

Rejected synchronously with the failing field named. Check enum values, ranges, and URL fields — nothing is charged.

Authentication or balance issue

401 means a missing or invalid Bearer key; 402 means the reserve exceeds your balance. Manage keys and credits in the console.

Content or material rejected

Reference material and outputs pass automated moderation. Rejected tasks fail with a clear error and a full refund.

Task failed or timed out

A task that reaches a failed state is never charged — the reserve refunds automatically. Keep the task id and retry when ready.

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 unified /api/v1/images/generations endpoint, billed at a flat per-image rate. See current rate in the pricing table on this page.

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Ready to ship?

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

Try Imagen 4.0View API Docs