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

# Models

> Choose a Writer & Humanizer model

| Model                      | Use                                                                                                             | Price                |
| -------------------------- | --------------------------------------------------------------------------------------------------------------- | -------------------- |
| <span id="super" />`super` | Highest detector bypass. Its structural rewrite also removes Claude and Gemini SynthID text watermarks.         | \$0.05 / 100 words   |
| `standard`                 | General-purpose full rewrite that balances quality and cost. Removes Claude and Gemini SynthID text watermarks. | \$0.20 / 1,000 words |
| `lite`                     | Fast, light cleanup for drafts. Not designed for detector bypass or watermark removal.                          | \$0.20 / 1,000 words |

See [Pricing](/api-reference/pricing) for account billing and rate limits.

## Supported interfaces

All three current model IDs work with:

* [`POST /api/stealthify`](/api-reference/endpoints/stealthify) for synchronous generation or humanization.
* [`POST /api/stealthify/runs`](/api-reference/endpoints/stealthify-runs) for asynchronous humanization, including PDF, DOCX, TXT, and MD uploads up to 4 MB.
* MCP [`humanize_text`](/api-reference/integrations/mcp) for asynchronous humanization from MCP clients.

## Usage

* For humanization, send only the source text in `prompt` (synchronous) or `text` (asynchronous). Do not add instructions such as "Humanize this."
* `qualityMode: "quality"` is the default. Use `"fast"` for a single-pass rewrite.
* `outputFormat` accepts `"text"` or `"markdown"`. All models accept multilingual source text.

### Synchronous

```bash theme={null}
curl --request POST \
  --url 'https://stealthgpt.ai/api/stealthify' \
  --header 'api-token: YOUR_API_TOKEN' \
  --header 'Content-Type: application/json' \
  --data '{
    "prompt": "Source text to humanize.",
    "rephrase": true,
    "model": "super"
  }'
```

### Asynchronous

```bash theme={null}
curl --request POST \
  --url 'https://stealthgpt.ai/api/stealthify/runs' \
  --header 'api-token: YOUR_API_TOKEN' \
  --header 'Content-Type: application/json' \
  --data '{
    "text": "Source text to humanize.",
    "model": "super"
  }'
```