Google Imagen 4 Ultra
Premium Imagen 4 tier. Highest fidelity, prompt adherence and typography quality from Google.
Google Imagen 4 Ultra is image generation AI model from Google DeepMind, priced at €0.000 per 1M input tokens with a unknown context window.
Pricing
API Integration
Use our OpenAI-compatible API to integrate Google Imagen 4 Ultra into your application.
npm install railwailimport railwail from "railwail";
const rw = railwail("YOUR_API_KEY");
const images = await rw.run("imagen-4-ultra", "A beautiful sunset over Tokyo");
console.log(images[0].url);
// Or use the image() method for full control
const res = await rw.image("imagen-4-ultra", "A cat in space", {
size: "1024x1024",
n: 1,
});
console.log(res.data[0].url);Deep dive — Google DeepMind's Google Imagen 4 Ultra
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 →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
- 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.
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.
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
Frequently asked questions
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