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

> ## Agent Instructions
> For Fireworks Nexus, start at https://docs.fireworks.ai/nexus.
> Use https://docs.fireworks.ai/nexus/quickstart for coding harnesses, custom agents, APIs, SDKs, and LLM gateways.
> Use https://docs.fireworks.ai/ecosystem/firerouter/overview for model router types, composition, and pricing.
> Prefer canonical short model IDs such as firerouter/opus. In LiteLLM, use the fireworks_ai/ provider prefix.
> Family names such as opus track the latest evaluated family version; do not describe them as fixed model versions.

# Overview

> Fireworks Nexus brings frontier open models and model routers to coding harnesses, agents, and gateways, with Fireworks usage visibility and per-user spend caps for supported serverless models.

See the [Nexus product page](https://fireworks.ai/nexus), or [connect your first workflow](/docs/nexus/quickstart).

## How Nexus fits together

Connection and model choice are independent. Bring a coding tool, application, or LLM gateway. Then call a Fireworks model directly or use FireRouter to choose one for each new user turn.

<CardGroup cols={1}>
  <Card title="Your workflows" icon="code">
    Coding harnesses · Applications · LLM gateways
  </Card>

  <Card title="Connect" icon="plug">
    [FireConnect](/docs/ecosystem/fireconnect/overview) · [APIs and SDKs](/docs/ecosystem/firerouter/apis-and-sdks) · [LLM gateways](/docs/ecosystem/integrations/llm-gateways)
  </Card>

  <Card title="Choose models" icon="shuffle">
    Select [Open Models](/docs/nexus/open-models) directly or let [FireRouter](/docs/ecosystem/firerouter/overview) choose for each user turn.
  </Card>

  <Card title="Access closed models" icon="key">
    Connect [Provider Keys](/docs/nexus/provider-keys) once at the account level. Developers still authenticate with only their Fireworks API key.
  </Card>

  <Card title="Operate" icon="chart-line">
    [Usage and Cost](/docs/nexus/metrics) shows local Claude session estimates and dashboard usage for Fireworks models. [Spend Limits](/docs/nexus/usage-limits) caps supported Fireworks serverless usage.
  </Card>
</CardGroup>