# FLUX 1.1 Pro Ultra - Core.Today AI API

> FLUX1.1 [pro] in ultra and raw modes. Images are up to 4 megapixels — the highest-resolution tier of the FLUX 1.1 Pro family. Use raw mode for realism.

- **Provider**: Black Forest Labs
- **Model ID**: black-forest-labs/flux-1.1-pro-ultra
- **Category**: Image Generation
- **Credits**: 140 per image
- **Speed**: Medium
- **Quality**: Ultra

## Features
- Up to 4-megapixel ultra-resolution output
- Raw mode for less processed, more natural-looking images
- Flux Redux image_prompt support for composition guidance
- Wide range of aspect ratios (21:9 to 9:21)
- Adjustable safety tolerance

## Use Cases
- Print and large-format marketing imagery requiring high resolution
- Photorealistic product or lifestyle photography with raw mode
- Composition-guided generation using a reference image_prompt
- Premium hero images for landing pages and campaigns

## API Endpoint

Base URL: https://api.core.today/v1
Create Prediction: POST /predictions
Get Status: GET /predictions/{job_id}

## Authentication
Header: X-API-Key: YOUR_API_KEY

## Input Parameters

### Required
- **prompt**: string - Text prompt for image generation

### Optional
- **raw**: boolean (default: false) - Generate less processed, more natural-looking images
- **image_prompt**: string - Image to guide composition via Flux Redux, blended with the text prompt
- **image_prompt_strength**: number (default: 0.1) - Blend strength between the text prompt and the image prompt (0-1)
- **aspect_ratio**: string (default: 1:1) - Aspect ratio for the generated image
  Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16, 9:21
- **safety_tolerance**: integer (default: 2) - Safety tolerance, 1 is most strict and 6 is most permissive
- **output_format**: string (default: jpg) - Format of the output images
  Options: jpg, png
- **seed**: integer - Random seed. Set for reproducible generation

## Examples

### Landscape Photography
High-resolution scenic landscape at 3:2 aspect ratio
```json
{
  "model": "black-forest-labs/flux-1.1-pro-ultra",
  "input": {
    "prompt": "a majestic snow-capped mountain peak bathed in a warm glow of the setting sun",
    "aspect_ratio": "3:2",
    "raw": false
  }
}
```

### Raw Mode Portrait
Natural-looking, less processed portrait using raw mode
```json
{
  "model": "black-forest-labs/flux-1.1-pro-ultra",
  "input": {
    "prompt": "a candid portrait of a chef in a busy kitchen, natural lighting",
    "raw": true,
    "aspect_ratio": "4:5"
  }
}
```

## Response Format
```json
{
  "job_id": "abc123",
  "status": "pending | processing | completed | failed",
  "result": "URL or data (when completed)"
}
```

## Usage Flow
1. POST /predictions with model and input -> receive job_id
2. GET /predictions/{job_id} -> poll until status is completed or failed
3. Result contains output URL(s)

## Tips
- Use raw=true for photorealistic, less stylized results
- image_prompt with image_prompt_strength lets you guide composition from a reference photo
- This is the premium 4MP tier of the FLUX 1.1 Pro family — use the standard FLUX 1.1 Pro for lower-cost needs
- Lower safety_tolerance for stricter content filtering in production apps

## Documentation
https://replicate.com/black-forest-labs/flux-1.1-pro-ultra