# Flux 1.1 Pro

Faster, better FLUX Pro. Text-to-image model with excellent image quality, prompt adherence, and output diversity.

## API Information

- **Model Slug:** flux-1-1-pro
- **Branded URL:** https://www.eachlabs.ai/black-forest-labs/flux-1-1/flux-1-1-pro
- **Provider:** Black Forest Labs
- **Category:** Text to Image
- **Output Type:** image
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** Fixed price per execution: $0.04
- **Estimated Processing Time:** 1 seconds
- **Last Updated:** 2026-06-01
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/flux-1-1-pro

## Pricing

- **Charge Type:** dynamic
- **Estimated Price (default example):** $0.0400
- **Pricing Details:** Fixed price per execution: $0.04

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| Rule 1 | Fixed price per execution: $0.04 |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | Text prompt for image generation |
| image_prompt | string | No | - | jpeg, jpg, png, webp | Image to use with Flux Redux. This is used together with the text prompt to guide the generation towards the composition of the image_prompt. Must be jpeg, png, gif, or webp. |
| aspect_ratio | string | No | 1:1 | custom,1:1,16:9,2:3,3:2,4:5,5:4,9:16,3:4,4:3 | An enumeration. |
| width | integer | No | - | 256–1440 | Width of the generated image in text-to-image mode. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16). Note: Ignored in img2img and inpainting modes. |
| height | integer | No | - | 256–1440 | Height of the generated image in text-to-image mode. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16). Note: Ignored in img2img and inpainting modes. |
| safety_tolerance | integer | No | 2 | 1–5 | Safety tolerance, 1 is most strict and 5 is most permissive |
| seed | integer | No | - | - | Random seed. Set for reproducible generation |
| prompt_upsampling | boolean | No | false | - | Automatically modify the prompt for more creative generation |
| output_format | string | No | jpg | jpg,png | 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 |

## 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-1-1-pro",
  "input": {
    "prompt": "Ultra realistic woman, IMG_5432.HEIC, nyc background"
  }
}'
```

## 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-1.1-pro — Text-to-Image AI Model**

flux-1.1-pro from Black Forest Labs delivers faster generation speeds up to 6x quicker than previous models while maintaining exceptional image quality, making it the go-to text-to-image AI model for professional workflows demanding speed and reliability. Developed as part of the flux-1.1 family, this 12B parameter model excels in prompt adherence, output diversity, and consistent results ideal for batch production in commercial design and marketing. Whether you're seeking a **Black Forest Labs text-to-image** solution or **flux-1.1-pro API** integration, it produces vivid, realistic images with precise anatomy, lighting, and materials in seconds.

## 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.