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

# Gateway

> Unified API gateway for multiple LLM providers

Gateway provides a unified API across OpenAI, Anthropic, and other LLM providers.

```mermaid theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
graph LR
    subgraph "Gateway"
        A[🤖 Agent] --> G[🚪 Gateway]
        G --> O[OpenAI]
        G --> AN[Anthropic]
        G --> OL[Ollama]
    end
    
    classDef agent fill:#6366F1,stroke:#7C90A0,color:#fff
    classDef gateway fill:#F59E0B,stroke:#7C90A0,color:#fff
    classDef provider fill:#10B981,stroke:#7C90A0,color:#fff
    
    class A agent
    class G gateway
    class O,AN,OL provider
```

## Quick Start

<Steps>
  <Step title="Switch Providers">
    ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
    use praisonai::Agent;

    // Same code works with any provider
    let agent = Agent::new()
        .name("Assistant")
        .model("gpt-4o")  // OpenAI
        .build()?;

    let agent = Agent::new()
        .name("Assistant")
        .model("claude-3-opus")  // Anthropic
        .build()?;

    let agent = Agent::new()
        .name("Assistant")
        .model("ollama/llama3")  // Local
        .build()?;
    ```
  </Step>
</Steps>

***

## Supported Providers

| Provider  | Prefix    | Example         |
| --------- | --------- | --------------- |
| OpenAI    | (none)    | `gpt-4o`        |
| Anthropic | (none)    | `claude-3-opus` |
| Ollama    | `ollama/` | `ollama/llama3` |
| Azure     | `azure/`  | `azure/gpt-4`   |

***

## Related

<CardGroup cols={2}>
  <Card title="LLM" icon="microchip" href="/docs/rust/llm">
    LLM configuration
  </Card>

  <Card title="Failover" icon="rotate" href="/docs/rust/failover">
    Provider fallback
  </Card>
</CardGroup>