> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kymaapi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Imagen 4 Fast

> Google Imagen 4 fast tier — quickest gen, lower fidelity. Cheapest Imagen on Kyma at $0.027/image. Synchronous API, blob-hosted output.

## Overview

`imagen-4-fast` is Google's fastest Imagen 4 variant — optimised for quick drafts, social previews, and rapid iteration over hero-fidelity work. Synchronous API, blob-hosted output, no async polling.

Lives in the same family as [`imagen-4`](/models/imagen-4) (default) and [`imagen-4-ultra`](/models/imagen-4-ultra) (premium). Pick by latency + cost; the underlying style language is the same.

## Specs

| Field            | Value                                         |
| ---------------- | --------------------------------------------- |
| Model ID         | `imagen-4-fast`                               |
| Creator          | Google                                        |
| Best for         | Drafts, social previews, rapid iteration      |
| Aspect ratios    | `1:1` (default), `3:4`, `4:3`, `16:9`, `9:16` |
| Sample count `n` | 1–4                                           |
| Pricing mode     | Flat per image                                |
| Default latency  | \~5–10s                                       |
| Output           | Blob-hosted URL (Vercel CDN)                  |

## Pricing

Flat per-image. List = provider cost × 1.35.

| Variant         | Provider cost |  Kyma list  |
| --------------- | :-----------: | :---------: |
| `imagen-4-fast` |    \$0.020    | **\$0.027** |

Live source: `GET https://kymaapi.com/v1/pricing`.

## Compared to other image models on Kyma

| Strength         | imagen-4-fast | [`imagen-4`](/models/imagen-4) | [`imagen-4-ultra`](/models/imagen-4-ultra) | [`nano-banana`](/models/nano-banana) |
| ---------------- | :-----------: | :----------------------------: | :----------------------------------------: | :----------------------------------: |
| Cheapest Imagen  |   **★★★★★**   |              ★★★★              |                     ★★                     |                  n/a                 |
| Photoreal humans |      ★★★      |              ★★★★              |                  **★★★★★**                 |                  ★★★                 |
| Print fidelity   |       ★★      |              ★★★★              |                  **★★★★★**                 |                  ★★                  |
| Speed            |   **★★★★★**   |              ★★★★              |                     ★★★                    |                 ★★★★★                |
| Edit-mode        |       —       |                —               |                      —                     |                **yes**               |

## Use this when

* You need many quick drafts to iterate prompts cheaply.
* The output is a social preview, draft mockup, or low-resolution asset.
* Speed beats fidelity.

## Pick something else when

* You need photoreal hero output → [`imagen-4`](/models/imagen-4) or [`imagen-4-ultra`](/models/imagen-4-ultra).
* You need to **edit** an existing image (image-in, prompt-driven) → [`nano-banana`](/models/nano-banana).
* You need **legible text-in-image** → [`gpt-image-2`](/models/gpt-image-2) (high tier).

## Example

```bash theme={null}
curl -X POST https://kymaapi.com/v1/images/generations \
  -H "Authorization: Bearer $KYMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "imagen-4-fast",
    "prompt": "A minimalist Scandinavian living room with morning light, soft pastels",
    "size": "16:9",
    "n": 1
  }'
```

The endpoint is async — POST returns `202` with a `job_id`; poll [`GET /v1/jobs/{id}`](/api-reference/images-generations#poll-for-the-result) until status is `succeeded`. The completed job's `output.url` is a Vercel blob URL on Kyma's CDN.