liter-llm 1.2.2

# Rust

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Universal LLM API client for Rust. Access 143+ LLM providers — OpenAI, Anthropic, Groq, Mistral, and more — through a single unified interface. Async/await with Tokio, streaming via BoxStream, composable Tower middleware stack, and compile-time type safety.


## Installation

### Package Installation






### System Requirements


- See [Installation Guide](https://github.com/kreuzberg-dev/liter-llm#installation) for requirements



## Quick Start

### Basic Chat

Send a message to any provider using the `provider/model` prefix:

```rust
use liter_llm::{
    ChatCompletionRequest, ClientConfigBuilder, DefaultClient, LlmClient,
    Message, UserContent, UserMessage,
};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = ClientConfigBuilder::new(std::env::var("OPENAI_API_KEY")?)
        .build();
    let client = DefaultClient::new(config, Some("openai/gpt-4o"))?;

    let request = ChatCompletionRequest {
        model: "openai/gpt-4o".into(),
        messages: vec![Message::User(UserMessage {
            content: UserContent::Text("Hello!".into()),
            name: None,
        })],
        ..Default::default()
    };

    let response = client.chat(request).await?;
    if let Some(choice) = response.choices.first() {
        println!("{}", choice.message.content.as_deref().unwrap_or(""));
    }
    Ok(())
}
```


### Common Use Cases


#### Streaming Responses

Stream tokens in real time:

```rust
use futures::StreamExt;
use liter_llm::{
    ChatCompletionRequest, ClientConfigBuilder, DefaultClient, LlmClient,
    Message, UserContent, UserMessage,
};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = ClientConfigBuilder::new(std::env::var("OPENAI_API_KEY")?)
        .build();
    let client = DefaultClient::new(config, Some("openai/gpt-4o"))?;

    let request = ChatCompletionRequest {
        model: "openai/gpt-4o".into(),
        messages: vec![Message::User(UserMessage {
            content: UserContent::Text("Tell me a story".into()),
            name: None,
        })],
        ..Default::default()
    };

    let mut stream = client.chat_stream(request).await?;
    while let Some(chunk) = stream.next().await {
        let chunk = chunk?;
        if let Some(choice) = chunk.choices.first() {
            if let Some(content) = &choice.delta.content {
                print!("{content}");
            }
        }
    }
    println!();
    Ok(())
}
```





### Next Steps

- **[Provider Registry](https://github.com/kreuzberg-dev/liter-llm/blob/main/schemas/providers.json)** - Full list of supported providers
- **[GitHub Repository](https://github.com/kreuzberg-dev/liter-llm)** - Source, issues, and discussions



## Features

### Supported Providers (143+)

Route to any provider using the `provider/model` prefix convention:

| Provider | Example Model |
|----------|--------------|
| **OpenAI** | `openai/gpt-4o`, `openai/gpt-4o-mini` |
| **Anthropic** | `anthropic/claude-3-5-sonnet-20241022` |
| **Groq** | `groq/llama-3.1-70b-versatile` |
| **Mistral** | `mistral/mistral-large-latest` |
| **Cohere** | `cohere/command-r-plus` |
| **Together AI** | `together/meta-llama/Meta-Llama-3.1-70B-Instruct-Turbo` |
| **Fireworks** | `fireworks/accounts/fireworks/models/llama-v3p1-70b-instruct` |
| **Google Vertex** | `vertexai/gemini-1.5-pro` |
| **Amazon Bedrock** | `bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0` |

**[Complete Provider List](https://github.com/kreuzberg-dev/liter-llm/blob/main/schemas/providers.json)**

### Key Capabilities

- **Provider Routing** -- Single client for 143+ LLM providers via `provider/model` prefix
- **Local LLMs** — Connect to locally-hosted models via Ollama, LM Studio, vLLM, llama.cpp, and other local inference servers
- **Unified API** -- Consistent `chat`, `chat_stream`, `embeddings`, `list_models` interface

- **Streaming** -- Real-time token streaming via `chat_stream`


- **Tool Calling** -- Function calling and tool use across all supporting providers

- **Type Safe** -- Schema-driven types compiled from JSON schemas
- **Secure** -- API keys never logged or serialized, managed via environment variables
- **Observability** -- Built-in [OpenTelemetry](https://opentelemetry.io/docs/specs/semconv/gen-ai/) with GenAI semantic conventions
- **Error Handling** -- Structured errors with provider context and retry hints

### Performance

Built on a compiled Rust core for speed and safety:

- **Provider resolution** at client construction -- zero per-request overhead
- **Configurable timeouts** and connection pooling
- **Zero-copy streaming** with SSE and AWS EventStream support
- **API keys** wrapped in secure memory, zeroed on drop



## Provider Routing

Route to 143+ providers using the `provider/model` prefix convention:

```text
openai/gpt-4o
anthropic/claude-3-5-sonnet-20241022
groq/llama-3.1-70b-versatile
mistral/mistral-large-latest
```

See the [provider registry](https://github.com/kreuzberg-dev/liter-llm/blob/main/schemas/providers.json) for the full list.



## Proxy Server

liter-llm also ships as an OpenAI-compatible proxy server with Docker support:

```bash
docker run -p 4000:4000 -e LITER_LLM_MASTER_KEY=sk-your-key ghcr.io/kreuzberg-dev/liter-llm
```

See the [proxy server documentation](https://docs.liter-llm.kreuzberg.dev/server/proxy/) for configuration, CLI usage, and MCP integration.


## Documentation

- **[Documentation](https://docs.liter-llm.kreuzberg.dev)** -- Full docs and API reference
- **[GitHub Repository](https://github.com/kreuzberg-dev/liter-llm)** -- Source, issues, and discussions
- **[Provider Registry](https://github.com/kreuzberg-dev/liter-llm/blob/main/schemas/providers.json)** -- 143 supported providers

Part of [kreuzberg.dev](https://kreuzberg.dev).

## Contributing

Contributions are welcome! See [CONTRIBUTING.md](https://github.com/kreuzberg-dev/liter-llm/blob/main/CONTRIBUTING.md) for guidelines.

Join our [Discord community](https://discord.gg/xt9WY3GnKR) for questions and discussion.

## License

MIT -- see [LICENSE](https://github.com/kreuzberg-dev/liter-llm/blob/main/LICENSE) for details.