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.
Overview
imagen-4-fast is Google’s fastest Imagen 4 variant — optimised for quick drafts, social previews, and rapid iteration over hero-fidelity work. Sync API on Vertex AI, blob-hosted output, no async polling.
Lives in the same family as imagen-4 (default) and 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 |
| Backend | Vertex AI (imagen-4.0-fast-generate-001, us-central1) |
| 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 |
GET https://kymaapi.com/v1/pricing.
Compared to other image models on Kyma
| Strength | imagen-4-fast | imagen-4 | imagen-4-ultra | 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
Example
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
}'
202 with a job_id; poll GET /v1/jobs/{id} until status is succeeded. The completed job’s output.url is a Vercel blob URL on Kyma’s CDN.
