# Wan 2.5 T2V Fast - Core.Today AI API

> Fast text-to-video generation variant of Wan 2.5, optimized for speed with good quality output.

- **Provider**: Alibaba
- **Model ID**: wan-video/wan-2.5-t2v-fast
- **Category**: Video Generation
- **Credits**: 790 per video
- **Speed**: Medium
- **Quality**: High

## Features
- Faster generation than Wan 2.5 T2V
- Good quality text-to-video
- Audio synchronization support
- Multiple aspect ratios
- Cost-effective option

## Use Cases
- Rapid video prototyping
- Iterative content creation
- Social media content
- Quick concept visualization
- Batch video generation

## 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 description of the video to generate

### Optional
- **negative_prompt**: string - Negative prompt to avoid certain elements
- **audio**: string - Audio file (wav/mp3, 3-30s, ≤15MB) for voice/music synchronization
- **size**: string (default: 1280*720) - Video resolution and aspect ratio
  Options: 1280*720, 720*1280, 1920*1080, 1080*1920
- **duration**: integer (default: 5) - Video duration in seconds
  Options: 5, 10
- **enable_prompt_expansion**: boolean (default: true) - If set to true, the prompt optimizer will be enabled
- **seed**: integer - Random seed for reproducibility

## Examples

### Quick Scene Test
Fast text-to-video generation
```json
{
  "model": "wan-video/wan-2.5-t2v-fast",
  "input": {
    "prompt": "Colorful autumn leaves falling in a park, gentle breeze, warm sunlight filtering through trees, peaceful atmosphere",
    "aspect_ratio": "16:9",
    "duration": 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 for rapid iteration before switching to Wan 2.5 T2V for final output
- Half the credit cost of the standard version
- Same seed value produces similar results across fast and standard models
- Great for testing prompt variations quickly