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

# FAQ

> Common LinkModel questions grouped by setup, billing, API integration, task polling, CLI, and troubleshooting.

Use these pages to find the right answer quickly.

| Category                                | Questions covered                                                     |
| --------------------------------------- | --------------------------------------------------------------------- |
| [Authentication](/faq-authentication)   | API keys, bearer tokens, environment variables, and key safety.       |
| [Billing & Pricing](/faq-billing)       | How requests are priced, where to check usage, and what affects cost. |
| [API Integration](/faq-api-integration) | Endpoint selection, schemas, SDK usage, and request formats.          |
| [Tasks & Polling](/faq-tasks)           | `task_id`, terminal states, polling intervals, and output URLs.       |
| [CLI](/faq-cli)                         | CLI setup, credentials, JSON output, and automation workflows.        |
| [Troubleshooting](/faq-troubleshooting) | Common errors, failed tasks, missing outputs, and support details.    |

## Most common questions

### Which endpoint should I call?

Use `POST /image-generation` for image models and `POST /video-generation` for video models. Chat-compatible endpoints are listed separately in the API Reference.

### Why does the create endpoint return a task instead of the final asset?

Image and video generation can take time, so create endpoints return a `task_id`. Use the matching query endpoint to poll status and retrieve final output URLs when generation completes.

### How do I know which parameters a model supports?

Open the model page in the API Reference. Each model page defines the exact request schema, required fields, enum values, defaults, pricing notes, and live request playground.

### What should I include when contacting support?

Include the `request_id`, `task_id`, model name, endpoint, request payload, and the approximate request time. Do not share your API key.