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

# OpenRouter

> OpenRouter in ZeroTwo — unified access to 200+ models from dozens of providers through a single aggregator.

OpenRouter is a **model aggregator** that provides a unified API interface to 200+ AI models from many different providers. Rather than ZeroTwo integrating with each provider individually, OpenRouter acts as a gateway that makes a vast catalog of models accessible through a single integration.

***

## What OpenRouter Provides

In ZeroTwo, the OpenRouter integration expands the available model library beyond ZeroTwo's direct provider integrations. Through OpenRouter, you can access:

* **Additional model variants** from providers already in ZeroTwo (e.g., additional Llama sizes, additional Mistral variants)
* **Specialized and niche models** not available through direct provider integrations
* **Newer or experimental models** that OpenRouter adds before direct integrations are available
* **Rare open-source models** that don't have their own hosted API

The exact OpenRouter model selection in ZeroTwo's model picker reflects what OpenRouter currently offers and what ZeroTwo has surfaced from that catalog.

***

## Typical Models Available via OpenRouter

OpenRouter's catalog changes frequently as new models are added. Models often available through OpenRouter include:

* Additional Llama variants (Meta's open-source models in various sizes)
* Mistral model variants not in ZeroTwo's direct Mistral integration
* Research-focused models from academic institutions
* Specialized domain models (medical, legal, coding-specific)
* Newer open-source releases before direct integration

<Note>
  The specific OpenRouter models visible in ZeroTwo's model picker may differ from OpenRouter's full catalog. ZeroTwo surfaces a curated selection of OpenRouter models. Check the model picker for current availability.
</Note>

***

## Strengths

**Widest model variety:** OpenRouter provides access to the largest number of distinct models of any single integration in ZeroTwo. If you're looking for a specific model not otherwise available, check OpenRouter first.

**Access to rare models:** Some specialized models exist only through OpenRouter — they don't have standalone public APIs.

**Model experimentation:** Power users who want to test specific model versions or compare across many variants will find OpenRouter's breadth useful.

***

## Best Use Cases

<CardGroup cols={2}>
  <Card title="Model exploration" icon="search">
    Testing and comparing model variants to find the best fit for a specific task or use case.
  </Card>

  <Card title="Accessing niche models" icon="layers">
    Specialized models (domain-specific, research models) that aren't available through direct integrations.
  </Card>

  <Card title="Early access to new models" icon="star">
    OpenRouter often adds new models quickly — useful for accessing recent releases.
  </Card>

  <Card title="Power users" icon="zap">
    Users who need access to the broadest possible range of models beyond ZeroTwo's direct integrations.
  </Card>
</CardGroup>

***

## Availability

OpenRouter model availability and the specific model selection surfaced in ZeroTwo may vary over time as:

* OpenRouter adds and removes models from its catalog
* ZeroTwo updates which OpenRouter models it surfaces in the model picker

Always check ZeroTwo's **Model Picker** for the current list of available OpenRouter models.

***

<Tip>
  If you're looking for a specific model and can't find it in ZeroTwo's direct provider integrations, check the Model Picker's OpenRouter section — it's likely the best place to find niche or newly-released models.
</Tip>