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

# Features

> What the API implements today.

One key reaches the catalog, the `model` string selects the model and its privacy level, and Nito handles routing, metering, and attestation. New to that frame? Read [How the API Works](/api/get-started/how-nito-works).

* [**Chat completions**](/api/features/chat-completions): messages in, reply out, at `/v1/chat/completions`.
* [**Streaming**](/api/features/streaming): the reply as Server-Sent Events.
* [**Tool calling**](/api/features/tool-calling): function tools the model asks to call; your code runs them.
* [**Server-side tools**](/api/features/server-side-tools): web search, web fetch, and the file parser, run by Nito.
* [**Reasoning**](/api/features/reasoning): think first, with effort and summary controls.
* [**Multimodal**](/api/features/multimodal): image and document input.
* [**Model Fusion**](/api/features/multi-model-routing): several models on one prompt, in the Browser App and Plugin.
* [**Prompt caching**](/api/features/prompt-caching): provider cache markers passed through.
* [**Safe retries**](/api/features/safe-retries): failed calls are not charged.
* [**Best practices**](/api/features/best-practices): latency, cost, keys, logging, fallbacks.

Also served: `POST /v1/messages` and `/v1/messages/count_tokens` (Anthropic shape) and a stateless `POST /v1/responses` and `/v1/responses/compact`. See [SDKs](/api/sdks) and the [API Reference](/api/api-reference).

## Related

<CardGroup cols={2}>
  <Card title="How the API Works" icon="gears" href="/api/get-started/how-nito-works">
    The request lifecycle.
  </Card>

  <Card title="Chat Completions" icon="message" href="/api/features/chat-completions">
    The main endpoint.
  </Card>

  <Card title="Privacy Overview" icon="shield-check" href="/privacy/overview">
    The four levels.
  </Card>

  <Card title="API Reference" icon="book" href="/api/api-reference">
    Every endpoint.
  </Card>
</CardGroup>


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