app.py

import gradio as gr

MODELS = [
    "sora-2",
    "veo-3",
    "runway-gen4",
    "kling-v3-pro",
]

MODEL_INFO = {
    "sora-2":       {"provider": "OpenAI", "resolution": "Up to 4K", "duration": "Up to 20s", "best_for": "Cinematic storytelling"},
    "veo-3":        {"provider": "Google DeepMind", "resolution": "Up to 4K", "duration": "Up to 8s", "best_for": "Realistic motion"},
    "runway-gen4":  {"provider": "Runway", "resolution": "Up to 4K", "duration": "Up to 16s", "best_for": "Creative/artistic"},
    "kling-v3-pro": {"provider": "Kling AI", "resolution": "Up to 4K", "duration": "Up to 10s", "best_for": "High quality, competitive"},
}

def generate_video(api_key, model, prompt, duration, aspect_ratio):
    if not api_key or api_key == 'your_nexaapi_key':
        return None, "⚠️ Please enter your NexaAPI key. Get one free at https://nexa-api.com"
    
    try:
        from nexaapi import NexaAPI
        client = NexaAPI(api_key=api_key)
        
        response = client.video.generate(
            model=model,
            prompt=prompt,
            duration=int(duration),
            aspect_ratio=aspect_ratio,
            quality='cinematic'
        )
        
        info = MODEL_INFO.get(model, {})
        result_text = f"""✅ Video generated!

**Model**: {model} ({info.get('provider', '')})
**URL**: {response.video_url}
**Cost**: ~$0.05–$0.20 (vs $0.30–$2.00 direct)

---
🔗 Get your API key: [nexa-api.com](https://nexa-api.com)
🔌 RapidAPI: [rapidapi.com/user/nexaquency](https://rapidapi.com/user/nexaquency)"""
        
        return response.video_url, result_text
    except Exception as e:
        return None, f"❌ Error: {str(e)}\n\nGet your API key at https://nexa-api.com"


with gr.Blocks(title="AI Video Generation Model Comparison 2026") as demo:
    gr.Markdown("""
# 🎬 AI Video Generation Model Comparison 2026
### Sora 2 vs Veo 3 vs Runway Gen-4 vs Kling AI — All via One API

Compare all major AI video generation models through **[NexaAPI](https://nexa-api.com)** — 
one unified endpoint, 5–10× cheaper than official pricing.

| Model | Provider | Resolution | Duration | Best For |
|-------|---------|-----------|---------|---------|
| sora-2 | OpenAI | Up to 4K | Up to 20s | Cinematic storytelling |
| veo-3 | Google DeepMind | Up to 4K | Up to 8s | Realistic motion |
| runway-gen4 | Runway | Up to 4K | Up to 16s | Creative/artistic |
| kling-v3-pro | Kling AI | Up to 4K | Up to 10s | High quality |

---
    """)
    
    with gr.Row():
        api_key = gr.Textbox(label="NexaAPI Key", placeholder="Get free at nexa-api.com", type="password")
    
    with gr.Row():
        model = gr.Dropdown(choices=MODELS, value="kling-v3-pro", label="Model")
        aspect_ratio = gr.Dropdown(choices=["16:9", "9:16", "1:1", "4:3"], value="16:9", label="Aspect Ratio")
        duration = gr.Slider(2, 10, value=5, step=1, label="Duration (seconds)")
    
    prompt = gr.Textbox(
        label="Video Prompt",
        value="A cinematic drone shot over a misty mountain range at golden hour",
        lines=2
    )
    
    btn = gr.Button("🎬 Generate Video", variant="primary")
    
    with gr.Row():
        video_out = gr.Video(label="Generated Video")
        result_info = gr.Markdown()
    
    btn.click(generate_video, inputs=[api_key, model, prompt, duration, aspect_ratio], outputs=[video_out, result_info])
    
    gr.Markdown("""
---
## 🚀 Get Started

- 🌐 **NexaAPI**: [nexa-api.com](https://nexa-api.com) — Free tier, no credit card
- 🔌 **RapidAPI**: [rapidapi.com/user/nexaquency](https://rapidapi.com/user/nexaquency)
- 🐍 **Python**: `pip install nexaapi` → [PyPI](https://pypi.org/project/nexaapi/)
- 📦 **Node**: `npm install nexaapi` → [npm](https://www.npmjs.com/package/nexaapi)
- 📊 **GitHub**: [ai-video-generation-api-benchmark](https://github.com/diwushennian4955/ai-video-generation-api-benchmark)
- 📝 **Tutorial**: [Dev.to Article](https://dev.to/diwushennian4955/how-to-access-sora-2-veo-3-and-runway-gen-4-with-one-api-key-5hno)

**50+ models. 5× cheaper. One API key.**
    """)

demo.launch()