LiveGoogle · Imagen 4 family3 endpoints

Imagen 4 API — Fast, Standard & Ultra Text-to-Image

The Imagen 4 API hub brings Google's live Imagen 4, Imagen 4 Fast, and Imagen 4 Ultra text-to-image endpoints into one Muapi catalog. Choose a lower-cost fast model for ideation, the standard model for balanced output, or Ultra for production-oriented photorealism with one asynchronous API workflow.

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Imagen 4Balanced photorealism and text rendering1 models

Text to ImageLiveFeatured

Standard

Imagen 4

Generate photorealistic images with crisp detail, accurate text rendering, and flexible aspect ratios.

Up to 2K

$0.03/generation

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Imagen 4 FastRapid ideation and lower-cost drafts1 models

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Fast

Imagen 4 Fast

Create high-quality draft images quickly for storyboards, ideation, and rapid creative iteration.

Flexible aspect ratiosFast

$0.02/generation

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Imagen 4 UltraFlagship photorealistic image generation1 models

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Ultra

Imagen 4 Ultra

Produce production-level photorealistic imagery with rich textures, precise lighting, and detailed compositions.

Flexible aspect ratios

$0.06/generation

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What is the Imagen 4 API?

Google Imagen 4 is a text-to-image family exposed through Muapi as three live endpoints: Imagen 4, Imagen 4 Fast, and Imagen 4 Ultra. Every endpoint requires a prompt and accepts the same five aspect-ratio choices: 16:9, 9:16, 1:1, 4:3, and 3:4.

Use Imagen 4 Fast at $0.02 per generation for quick exploration, standard Imagen 4 at $0.03 for balanced output, or Imagen 4 Ultra at $0.06 for the family's flagship photorealistic tier. The base and Fast endpoints also accept num_images from 1 to 4, with each generated image charged separately; Ultra does not expose num_images in its current schema. The model metadata for standard Imagen 4 also documents SynthID watermarking for authenticity.

Imagen 4 API capabilities

Prompt-to-image generation

Turn a detailed text prompt into photorealistic images with Imagen 4, Fast, or Ultra.

Five aspect ratios

Choose 16:9, 9:16, 1:1, 4:3, or 3:4 on every listed Imagen 4 endpoint.

Fast batch ideation

Imagen 4 and Imagen 4 Fast support 1 to 4 images per request; each output is billed separately.

Quality and price tiers

Compare Fast at $0.02, standard Imagen 4 at $0.03, and Ultra at $0.06 per generation.

Quick start — Imagen 4 API

Submit a Google Imagen 4 text-to-image task with your Muapi key, receive a request ID, and poll the shared predictions endpoint for the image URL.

1. Submit an Imagen 4 job

curl -X POST https://api.muapi.ai/api/v1/google-imagen4 \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"A richly detailed glasshouse at sunrise, dew on tropical leaves, editorial photography","aspect_ratio":"16:9","num_images":1}'

# Response: {"request_id":"REQUEST_ID"}

The example calls standard Imagen 4 with a prompt, aspect ratio, and one output. Switch the endpoint slug to Fast or Ultra when you need another tier.

2. Poll the result

curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \
  -H "x-api-key: YOUR_API_KEY"

Poll until the task completes, then read the generated image URL from the result response.

Imagen 4 API FAQ

Which Imagen 4 endpoints are available?

Muapi lists three enabled Google Imagen endpoints: google-imagen4, google-imagen4-fast, and google-imagen4-ultra.

What is the difference between Imagen 4, Fast, and Ultra?

Imagen 4 Fast is the lower-cost option for rapid ideation at $0.02 per generation, standard Imagen 4 is the balanced $0.03 tier, and Imagen 4 Ultra is the $0.06 flagship tier for production-oriented photorealistic imagery.

What inputs does the Imagen 4 API require?

Every endpoint requires prompt. All three accept aspect_ratio with 16:9, 9:16, 1:1, 4:3, and 3:4 choices. google-imagen4 and google-imagen4-fast additionally accept num_images from 1 to 4; each generated image is charged separately.

Can Imagen 4 generate different aspect ratios?

Yes. The current schema exposes 16:9, 9:16, 1:1, 4:3, and 3:4 on Imagen 4, Fast, and Ultra.

How much does Imagen 4 cost on Muapi?

Imagen 4 costs $0.03 per generation, Imagen 4 Fast costs $0.02, and Imagen 4 Ultra costs $0.06. For the base and Fast endpoints, a multi-image request is billed once per generated image.

Explore Nano Banana API →Compare Google's other image generation and editing family on Muapi.Compare AI image APIs →See Imagen 4 alongside FLUX, Seedream, GPT Image, Midjourney, and other image models.Browse text-to-image models →Compare Imagen 4 with other prompt-to-image endpoints by capability and price.Read the API docs →Learn Muapi's authentication and asynchronous result flow.

Build with Imagen 4

Connect Google Imagen 4, Fast, and Ultra image generation through one Muapi API key and a shared request workflow.

Get an API Key Try Imagen 4