# Flux Dev

A 12 billion parameter rectified flow transformer capable of generating images from text descriptions

## API Information

- **Model Slug:** flux-dev
- **Branded URL:** https://www.eachlabs.ai/black-forest-labs/flux-dev/flux-dev
- **Provider:** Black Forest Labs
- **Category:** Text to Image
- **Output Type:** image
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** Fixed price per execution: $0.025
- **Estimated Processing Time:** 5 seconds
- **Last Updated:** 2026-07-13
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/flux-dev

## Pricing

- **Charge Type:** dynamic
- **Estimated Price (default example):** $0.0250
- **Pricing Details:** Fixed price per execution: $0.025

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| Rule 1 | Fixed price per execution: $0.025 |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | Prompt for generated image |
| aspect_ratio | string | No | 1:1 | 1:1,16:9,21:9,2:3,3:2,4:5,5:4,9:16,9:21 | An enumeration. |
| image | string | No | - | image/jpeg, image/png, image/jpg, image/webp | Input image for image to image mode. The aspect ratio of your output will match this image |
| prompt_strength | number | No | 0.8 | 0–1 | Prompt strength when using img2img. 1.0 corresponds to full destruction of information in image |
| num_outputs | integer | No | 1 | 1–4 | Number of outputs to generate |
| num_inference_steps | integer | No | 28 | 1–50 | Number of denoising steps. Recommended range is 28-50 |
| guidance | number | No | 3.5 | 0–10 | Guidance for generated image. Ignored for flux-schnell |
| seed | integer | No | - | - | Random seed. Set for reproducible generation |
| output_format | string | No | webp | webp,png,jpg | An enumeration. |
| output_quality | integer | No | 80 | 0–100 | Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs |
| disable_safety_checker | boolean | No | false | - | Disable safety checker for generated images. This feature is only available through the API |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux-dev",
  "input": {
    "prompt": "black forest gateau banner spelling out the words \"FLUX DEV\", tasty, dynamic shot"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "string (URL of generated image)",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "Authorization: Bearer YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `Authorization` bearer token |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**flux-dev — Text to Image AI Model**

flux-dev from Black Forest Labs delivers exceptional text-to-image generation as part of the pioneering FLUX family, excelling in high-fidelity photorealistic outputs and precise prompt adherence for developers and creators seeking **Black Forest Labs text-to-image** capabilities. This 12 billion parameter rectified flow transformer stands out for local development workflows, supporting up to 6 multi-reference images to maintain character consistency and style transfer in complex compositions. Ideal for users searching for a **flux-dev API** or advanced **text-to-image AI model**, flux-dev enables detailed image creation from structured text prompts, including HEX color codes and pose guidance, at resolutions up to 4MP.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `Authorization: Bearer YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.