> ## Documentation Index
> Fetch the complete documentation index at: https://docs.yelinai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sora 2 Video Generation API

> Sora 2 API access: OpenAI's official video generation model. Text-to-video and image-to-video supported. No watermark, 1080P HD, $0.15/video. Affordable alternative to official pricing.

**Base URL:** `https://api.yelinai.com/v1/chat/completions`
**API Version:** `v1`
**Service Status:** Running | **No Watermark** | **No Invitation Code Required**

**Need ultimate stability?** If the current solution doesn’t meet your stability requirements, try the [Official Forward Plan](/en/api-capabilities/sora2/official-forward) (OpenAI official API transparent forwarding, 99.99% availability).

## Prerequisites

1

Get API Key

Log in to [YeLIn AI console](https://api.yelinai.com) to obtain your API key

2

Configure Billing Mode

Edit token settings and choose one of the following billing modes (same price for both):

* **Volume Priority** (Recommended): Uses balance billing first, automatically switches when balance is insufficient. Suitable for most users
* **Pay-per-call**: Direct deduction for each call. Suitable for strict budget control scenarios

Both modes have **exactly the same price** at \$0.15/call (10s or 15s), only the billing method differs.

<Note>
  请在 **Console** 查看对应界面截图。
</Note>

If billing mode is not configured, API calls will fail. You must complete this configuration first!

## Major Updates

**Release Date:** October 1, 2025
OpenAI suddenly released Sora 2 new version (The New Sora), and we integrated official website API immediately (reverse-engineered, before OpenAI released official API).

**Latest Updates**

* **01/04** New [Character Creation API](/en/api-capabilities/sora2/character), extract characters from videos and reuse via @username (\$0.01/call)
* **10/20** Massive price drop for 15s models! From 0.25to0.25 to 0.25to0.15/call, all models unified pricing; Added raw error log feature
* **10/18** Added support for generating videos with Sora native watermark (default is no watermark)
* **10/16** Restored 15-second models (sora\_video2-15s and sora\_video2-landscape-15s)
* **10/10** Added sora-2-pro HD model, supports HD 1080P and 15-second duration (Async API only)
* **10/07** Added Python example code; official sora-2 and sora-2-pro models launched but with high pricing and rate limits
* **10/01** Integrated Sora 2 reverse-engineered API, supports text-to-video and image-to-video

## Sora 2 Core Breakthroughs

## Audio-Video Sync

First-time synchronized audio-video generation

## Physical Realism

Dramatically improved physical realism

## Long Video Support

Supports 10-16 second coherent narrative videos

## No Watermark Output

Generated videos have no watermark (official website has watermarks)

## Cameo Feature

Supports integrating real-person recorded clips into AI scenes

## Remix Feature

Supports community remixing

## Core Features

## Text-to-Video

Generate videos from pure text descriptions

## Image-to-Video

Supports reference images (up to 1 image)

## Character Creation

Extract characters from videos, reuse via @username

## Async API

More stable task queue approach (recommended for production)

## Multi-Spec Support

Horizontal and vertical orientation options

## Pay-per-Use

Charged only by generation count

## Workflow

1

Configure API Key

Get API key from YeLIn AI console, set to **pay-as-you-go** or **pay-per-use** mode

2

Send Request

Call `/v1/chat/completions` endpoint, specify model and prompt

3

Real-time Progress

View task queue and generation progress through streaming output

4

Get Video

Obtain video link after generation completes (valid for 1 day)

5

Download & Save

Download video to local storage immediately

\*\*Price Update (10/20)\*\*🎉 **15-second models price drop!** From 0.25to0.25 to 0.25to0.15/callAll base models now unified at 0.15/call,regardlessofdurationororientation!HDmodelsora−2−pro(0.15/call, regardless of duration or orientation! HD model sora-2-pro (0.15/call,regardlessofdurationororientation!HDmodelsora−2−pro(0.8/call) is available via [Async API](/en/api-capabilities/sora2/async-api) only.

## Supported Models

| Model                       | Resolution | Duration | Price        | Stability                 |
| --------------------------- | ---------- | -------- | ------------ | ------------------------- |
| `sora_video2`               | 704×1280   | 10s      | \$0.15/video | ⭐⭐⭐⭐⭐ Extremely High      |
| `sora_video2-landscape`     | 1280×704   | 10s      | \$0.15/video | ⭐⭐⭐⭐⭐ Extremely High      |
| `sora_video2-15s`           | 704×1280   | 15s      | \$0.15/video | ⭐⭐⭐⭐⭐ Extremely High      |
| `sora_video2-landscape-15s` | 1280×704   | 15s      | \$0.15/video | ⭐⭐⭐⭐⭐ Extremely High      |
| `sora-2-pro`                | 1024×1792  | 15s      | \$0.8/video  | ⭐⭐⭐ Fair (Async API only) |

## Video Specifications

* **Duration:** 10 seconds or 15 seconds (selected via model name)
* **Quality:** 720P / HD
* **Orientation:** Vertical or horizontal (selected via model name)
* **Watermark:** No watermark
* **Audio:** Supports audio-video synchronization

## API Method Selection

**Recommended to use Async API**, especially in production environments or when batch generating videos, for better stability.

| Feature       | Sync API                          | Async API (Recommended)                  |
| ------------- | --------------------------------- | ---------------------------------------- |
| **Endpoint**  | `/v1/chat/completions`            | `/v1/videos`                             |
| **Stability** | Depends on long connection        | ⭐⭐⭐⭐⭐ More Stable                        |
| **Use Cases** | Quick testing, real-time feedback | Production environment, batch generation |

## Getting Started

## Sync API

Quick start with streaming output (for testing)

## Async API

Task queue, more stable (recommended for production)

## Character Creation

Extract characters, reuse via @username

## Model Pricing

Learn detailed model comparison and pricing

## Code Examples

View multi-language example code

## FAQ

Solve common issues

## Important Notes

\*\*Video storage valid for only 1 day!\*\*Generated videos are stored on domestic CDN for convenient access by domestic users. Please **download and save to local storage immediately** after generation.

Both models have extremely high stability. Choose horizontal or vertical mode based on your video display scenario.