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Google

Google

Imagen 4 Fast

Imagen 4 Fast is Google’s quickest image generation tier, optimized for rapid iteration and lower-fidelity outputs. Reach for it when you need fast drafts, social media previews, or high-volume generation where speed matters more than maximum detail.

Modalities

Text → Image

Price

$0.027 / image

Speed

fast

Pricing

Per image. Async generation; you only pay for successful renders.

$0.027 / image

When to use Imagen 4 Fast

Updated 2026-07-31

Where this model earns its cost — and where it doesn't.

Imagen 4 Fast is a text-to-image model from Google that generates photorealistic and multi-style visuals. It operates in a fast, cheap tier that prioritizes generation speed over maximum fidelity.

On Kyma, it accepts text prompts and returns images. It supports prompt caching, and requests are routed through an OpenAI-compatible endpoint with automatic failover if a serving path degrades. Usage responses include exact costs in usage.cost and report the running model via the X-Kyma-Model header.

This model does not support vision input, structured outputs, or reasoning. Token limits do not apply to this text-to-image workflow. Use it for quick visual drafts rather than final production assets requiring high detail.

Rapid Concept Drafting

Quickly generate placeholder visuals during early design phases.

Social Media Previews

Produce fast, multi-style images for content scheduling and testing.

High-Volume Generation

Scale image creation workflows where speed and cost efficiency matter more than maximum detail.

Not ideal for: Do not use this tier for final production assets or workflows that require high-fidelity detail, vision input, or structured output parsing.

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Submit a generation job and poll until it succeeds.

    curl https://kymaapi.com/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "imagen-4-fast",
    "prompt": "A serene mountain lake at sunrise, photorealistic",
    "n": 1
  }'
# Response: { "id": "img_...", "status": "queued" }
# Poll: GET /v1/jobs/{id} until status="succeeded"

FAQ

Common questions about this model.

How much does Imagen 4 Fast cost?

$0.027 per image. Per image. Async generation; you only pay for successful renders.

How do I use Imagen 4 Fast?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to imagen-4-fast. Signing up is free and includes $0.50 of credit — no card required.

Does Imagen 4 Fast support image-to-image or vision inputs?

No, it only accepts text prompts and outputs images. It does not support vision input or reasoning.

How does prompt caching affect my costs?

Kyma bills repeated prompt prefixes at 10% of the standard input rate, which applies here since the model supports caching.

Do I need separate API keys or handle routing manually?

No, Kyma uses one API key for every model and handles automatic failover if a serving path degrades.

Start with $0.50 free credit — no card required.Create account →

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