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

# FAQ

> Frequently Asked Questions

<AccordionGroup>
  <Accordion title="Is the API free to use?">
    We offer a free tier for developers and researchers. For high-volume commercial use, please contact us.
  </Accordion>

  <Accordion title="What languages are supported?">
    We support a wide range of African languages. Please refer to our [Supported Languages](/languages) page for the full list and their corresponding codes.
  </Accordion>

  <Accordion title="Do API tokens expire?">
    No, API tokens do not expire. You can generate a token once and use it indefinitely for your integrations.
  </Accordion>

  <Accordion title="What are the rate limits?">
    We currently have soft limits on concurrent requests. If you require higher throughput for enterprise applications, please contact support.
  </Accordion>

  <Accordion title="Can I fine-tune the models?">
    **SALT Library**: Yes, you can use the open-source `salt` package to fine-tune our models on your own datasets.
    **API**: The API serves pre-trained models and does not currently support custom fine-tuning via the endpoint.
  </Accordion>

  <Accordion title="How do I handle large audio files?">
    Files over 100MB should be uploaded via the signed URL workflow. See the [Speech to Text guide](/guides/speech-to-text) for details.
  </Accordion>
</AccordionGroup>