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Google Imagen 4 Ultra

Image generationRetiredUnavailable
by Google DeepMindModel ID: imagen-4-ultra

Premium Imagen 4 tier. Highest fidelity, prompt adherence and typography quality from Google.

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Status
Unavailable
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4
Resolution
1024×1024, 1024×1536, 1536×1024
Input → output
Text → Image
Developer
Google DeepMind
Updated
September 23, 2026

Google Imagen 4 Ultra is currently unavailable

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The provider has retired this model.

Newer version available: Nano Banana 2

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Comparable models

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Playground

Try Google Imagen 4 Ultra

Input & output

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Currently unavailable.

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Try Google Imagen 4 Ultra

0 / 2,000

What to generate

Advanced settings (4)

0 / 1,000

What to avoid

Optional seed for reproducibility

Output
Your image appears here.

This run

No price – currently unavailable.

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About Google Imagen 4 Ultra

TL;DRAs of September 23, 2026

Google Imagen 4 Ultra is a model by Google DeepMind in the Image generation category. Google Imagen 4 Ultra is currently not available on Railwail. Supported aspect ratios: 1:1, 16:9, 9:16, 4:3, and 3:4. Newer version: Nano Banana 2.

Background

About Google DeepMind

Founded 2010 · London, UK

Google DeepMind is the merged AI organisation of DeepMind (founded 2010 in London by Demis Hassabis, Shane Legg and Mustafa Suleyman) and Google Brain, formed in April 2023 and led by Demis Hassabis and Koray Kavukcuoglu. Imagen is Google's text-to-image diffusion family first introduced in May 2022 (Saharia et al.). The Imagen 4 generation, announced at Google I/O 2025, includes two tiers: Imagen 4 for everyday creative use and Imagen 4 Ultra for highest-fidelity output. Ultra targets professional design, editorial photography and enterprise creative workflows.

Visit Google DeepMind

Architecture

Diffusion model — top-tier variant of Imagen 4 (architecture undisclosed)

Imagen 4 Ultra is the high-fidelity tier of Google DeepMind's Imagen 4 text-to-image family, announced at Google I/O 2025 alongside the standard Imagen 4. While Google does not publish architectural details, Ultra is understood to be either a larger-parameter variant of the Imagen 4 backbone or a high-step / multi-pass inference configuration tuned for photorealism, fine texture, lighting consistency and accurate typography. The lineage descends from the original Imagen (Saharia et al. 2022) which used T5-XXL text encoding plus a cascaded pixel-space diffusion super-resolution pipeline, and the more recent Imagen 3 (Hayes et al. 2024). Ultra outputs are SynthID-watermarked and delivered exclusively via Google Cloud Vertex AI and selected Gemini and Workspace surfaces. Resolution support extends to 2K with strong adherence on long, descriptive prompts (~480 token text encoder context).

Parameters
Undisclosed (largest member of the Imagen 4 family)
Context
480 tokens

Capabilities

  • Highest-fidelity tier in the Imagen 4 family
  • Photorealism approaching FLUX 1.1 Ultra and Midjourney V7
  • Up to 2K native resolution
  • Excellent long-prompt understanding (~480 tokens)
  • Strong in-image typography
  • SynthID invisible watermark on every output
  • Enterprise SLA via Vertex AI
  • Best for: editorial photography, premium ads, magazine covers, enterprise brand work.

Training & license

Same base pretraining corpus as Imagen 4, fine-tuned and/or sampled with a higher-quality inference recipe for the Ultra tier. Exact data and tuning is not disclosed.

License: Proprietary commercial license via Google Cloud Vertex AI and approved Gemini/Workspace surfaces. Pay-per-image enterprise pricing.

Safety testing: Strict pre-release red-teaming under Google AI Principles. SynthID watermarking is mandatory. Filters cover CSAM, NCII, named persons, IP-protected characters and political content.

Known limitations

  • Vertex AI only — no public weights
  • Highest per-image cost in the Imagen line
  • Slower than Imagen 4 standard tier
  • Stricter content filters than open models

Research papers

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Pricing

Currently unavailable. There is no price for this model at the moment, so it cannot be run.

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API

Call Google Imagen 4 Ultra with your Railwail API key. Use this model ID in the request:
imagen-4-ultraAPI documentationGet an API key

Currently unavailable

The model has no verified price or is deactivated; API calls are refused.

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Specifications

Model ID
imagen-4-ultra
Developer
Google DeepMind
Category
Image generation
Input
Text
Output
Image
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4
Resolution
1024×1024, 1024×1536, 1536×1024
Lifecycle
Retired
Model size
Undisclosed (largest member of the Imagen 4 family)
License
Proprietary commercial license via Google Cloud Vertex AI and approved Gemini/Workspace surfaces. Pay-per-image enterprise pricing.
Catalog entry updated
September 23, 2026

Input parameters

Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.

  • promptrequired

    What to generate

    Type: Text
    Default: –
    Allowed values: up to 2,000 characters
  • seed

    Optional seed for reproducibility

    Type: Integer
    Default: –
    Allowed values: –
  • size
    Type: Choice
    Default: 1024x1024
    Allowed values: 1024x1024, 1024x1536, or 1536x1024
  • aspect_ratio
    Type: Choice
    Default: 1:1
    Allowed values: 1:1, 16:9, 9:16, 4:3, or 3:4
  • guidance_scale
    Type: Number
    Default: 7.5
    Allowed values: 1 to 20
  • negative_prompt

    What to avoid

    Type: Text
    Default: –
    Allowed values: up to 1,000 characters
  • num_inference_steps
    Type: Integer
    Default: 30
    Allowed values: 1 to 100

Tags

  • google
  • imagen
  • text-to-image
  • flagship
  • ultra
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Use cases

What it is used for

  • Premium advertising photography
  • Editorial covers and centrefolds
  • Luxury-brand campaign imagery
  • Enterprise hero shots and brand assets
  • Print-quality marketing collateral
  • High-end e-commerce product imagery
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Frequently asked questions

What is Google Imagen 4 Ultra?

Google Imagen 4 Ultra is a model by Google DeepMind in the Image generation category. It is listed on Railwail but cannot be run at the moment.

How much does Google Imagen 4 Ultra cost on Railwail?

Google Imagen 4 Ultra cannot be run on Railwail at the moment, so there is no current price. Available alternatives with prices are listed further down this page.

Which settings does Google Imagen 4 Ultra support?

According to its input schema, Google Imagen 4 Ultra knows these parameters: prompt (up to 2,000 characters), seed, size (1024x1024, 1024x1536, or 1536x1024), aspect_ratio (1:1, 16:9, 9:16, 4:3, or 3:4), guidance_scale (1 to 20), negative_prompt (up to 1,000 characters), and num_inference_steps (1 to 100).

How fast is Google Imagen 4 Ultra?

There are not enough measured runs of Google Imagen 4 Ultra on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is Google Imagen 4 Ultra better than Nano Banana 2?

That depends on the task. Google Imagen 4 Ultra (Google DeepMind) and Nano Banana 2 (Google DeepMind) are both models in the Image generation category. The comparison page shows their prices and specifications side by side.

Compare Google Imagen 4 Ultra and Nano Banana 2

Can I use Google Imagen 4 Ultra right now?

Currently unavailable. The page stays online; available alternatives from the same category are listed further down.

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