> For the complete documentation index, see [llms.txt](https://docs.alphaneural.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.alphaneural.io/core-concepts.md).

# Core Concepts

## 1. Models

Models represent the AI capabilities (chat, image generation, embeddings).

### List All Models

```bash
curl https://proxy.alfnrl.io/v1/models \
  -H "Authorization: Bearer YOUR_API_KEY"
```

Example response:

**json**

```json
{
  "object": "list",
  "data": [
    {"id": "qwen3"},
    {"id": "gemini-3-pro-preview"},
    {"id": "gemini/imagen-4.0"}
  ]
}
```

### 2. Tokens

Every request returns:

* prompt\_tokens
* completion\_tokens
* total\_tokens

### 3. Pricing

You are billed based on tokens used.

See your AlphaNeural Dashboard for pricing.

### 4. Rate Limits

Example rate limit error:

```json
{
  "error": {
    "message": "Rate limit exceeded",
    "type": "rate_limit_error",
    "code": 429
  }
}
```