google/imagen-3/fast
Imagen 3 Fast is Google's advanced text-to-image AI model. Create photorealistic images, illustrations, and concept art from natural language descriptions with exceptional detail and prompt adherence.
Example output — click Run to generate your own
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OpenAI-compatible endpoint with unified authentication and usage tracking.
https://api.sandbase.ai/v1/rungoogle/imagen-3/fastInput Schema
3 parameters · 1 required · 2 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
prompt | string | Required | The text prompt describing what you want to see |
seed | integer | Optional | Random seed for reproducible generation |
aspect_ratio | string | Optional | The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 21:916:93:24:35:41:14:53:42:39:16 |
Output Schema
| Field | Type | Description |
|---|---|---|
id | string | Unique identifier for the generation task |
status | string | Task status: pending, running, completed, failed, timeout |
model | string | Model used for the generation |
outputs | array | Array of output items |
outputs[].url | string | URL of the generated artifact |
outputs[].content_type | string | MIME type (e.g. image/png, video/mp4) |
error | object | null | Error details if failed, null on success |
error.type | string | Machine-readable error type code |
error.message | string | Human-readable error description |
Async Workflow
This model uses asynchronous execution. Submit a request and poll for the result.
- Submit — POST to /v1/run, receive an
id - Poll — GET /v1/run/{id} until status is
completed,failed, ortimeout - Retrieve — Read
outputsfrom the completed response
Code Examples
Ready-to-run snippets
# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "google/imagen-3/fast",
"prompt": "A serene landscape with mountains reflected in a crystal clear lake at sunset"
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
Imagen 3 Fast
google/imagen-3/fast creates original still imagery from detailed written art direction, resolving subject, environment, composition, lighting, material, and style without a source image. Imagen 3 is known for strong prompt adherence, photorealism, and clear embedded text across a wide variety of visual styles; this Fast variant reduces turnaround so teams can compare more concepts and compositions in the same creative window. This combination makes the model a practical choice when the creative outcome depends on those qualities rather than on a generic media conversion.
For production work, its speed-oriented generation is best used for rapid ideation, high-volume variants, and early art-direction review before choosing a slower quality-focused route. The result is most reliable when the source material and creative brief clearly describe the intended subject, progression, visual or sonic character, and the qualities that must remain unchanged.
Highlights
Prompt fidelity translates detailed descriptions into composed, relevant imagery.
Photorealistic rendering produces convincing lighting, materials, depth, and natural detail.
Typography generation renders clearer words and graphic text within the scene.
Rapid generation accelerates concept comparison and high-volume creative exploration.
Pricing
| Billing unit | Price |
|---|---|
| Per request | $0.025 |
When to Use
| ✅ Good fit | ❌ Consider alternatives |
|---|---|
| The model's named workflow matches the source material and intended output | A different input modality or model route is required |
| A managed asynchronous result is suitable for the production pipeline | A synchronous, interactive editor is essential |
| The documented controls cover the required duration, framing, or format | The project needs controls outside this endpoint's schema |
| Creative iteration benefits from a repeatable request structure | Exact deterministic pixels, frames, geometry, or samples are mandatory |
| A finished downloadable media asset is the desired deliverable | Editable source layers or a native project file are required |
Prompt Guide
For generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.
{
"aspect_ratio": "21:9",
"prompt": "A serene landscape with mountains reflected in a crystal clear lake at sunset"
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | google/imagen-3/fast |
| Inputs | aspect_ratio, prompt, seed |
| Required inputs | prompt |
| Output fields | content_type, url |
| Execution | Async (submit, then poll for result) |
| Aspect Ratio | 21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16 |