anthropik 0.1.2

Anthropic client for Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104

# Anthropik

A Rust client for the Anthropic API, named for my love of pikpik carrots.

[![Crates.io](https://img.shields.io/crates/v/anthropik.svg)](https://crates.io/crates/anthropik)
[![Documentation](https://docs.rs/anthropik/badge.svg)](https://docs.rs/anthropik)
[![License](https://img.shields.io/crates/l/anthropik.svg)](LICENSE)

## Status

This library is functional and actively used in [strands-rs](https://github.com/chaynabors/strands-rs), which I develop for fun. If there's interest or need, I'm happy to productionize it further. Open an issue if this would be useful to you.

## Why This Library?

I wrote this because existing Anthropic clients for Rust lack active maintainers with serious Rust experience, and a client is straightforward to implement and maintain properly.

**Alternatives considered:**

- [anthropic](https://crates.io/crates/anthropic) - Last updated over a year ago
- [anthropic-sdk-rust](https://crates.io/crates/anthropic-sdk-rust) - 7 months since last update
- [anthropic_client](https://crates.io/crates/anthropic_client) - Over a year old
- [genai](https://crates.io/crates/genai) - Multi-provider, actively developed

## Features

- All Claude models (Sonnet 4.5, Haiku 4.5, Opus 4, legacy models)
- Streaming and non-streaming responses
- Tool use (function calling)
- Vision support (images and PDFs)
- Extended thinking mode
- Prompt caching
- MCP server integration
- Type-safe with non-exhaustive structs for forward compatibility

## Installation

```bash
cargo add anthropik
```

## Getting Started

```bash
cargo add anthropik
cargo add tokio --features full
```

```rust
use anthropik::{
    AnthropicClient, Content, InputMessage, MessagesRequest,
    MessagesRequestBody, Model, Role,
};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let client = AnthropicClient::new();

    let response = client
        .messages(&MessagesRequest {
            x_api_key: std::env::var("ANTHROPIC_API_KEY")?.into(),
            body: MessagesRequestBody {
                model: Model::ClaudeSonnet4_5,
                messages: vec![InputMessage {
                    role: Role::User,
                    content: Content::String("Hello, Claude!".to_string()),
                    ..Default::default()
                }],
                max_tokens: 1024,
                ..Default::default()
            },
            ..Default::default()
        })
        .await?;

    println!("Response: {:?}", response);

    Ok(())
}
```

For streaming, use `messages_stream()` and set `stream: true` in the request body.

## Documentation

Full API documentation is available on [docs.rs](https://docs.rs/anthropik).

For Anthropic API details, see the [official documentation](https://docs.anthropic.com/).

## Design Notes

Most structs are marked `#[non_exhaustive]` to prevent breakage when new API fields are added. This trades some ergonomics (requiring `..Default::default()`) for stability as the library approaches 1.0.

## Contributing

Contributions welcome. Open an issue or submit a PR.

## License

Licensed under either of:

- MIT License ([LICENSE-MIT](LICENSE-MIT))
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE))

at your option.