Crate anthropic 

anthropic — community Rust SDK for the Anthropic API

This crate is an early port of the official anthropic-sdk-go to Rust. v0 implements only the non-streaming Messages API; streaming, tool use, multimodal, files, batches, Bedrock, Vertex, and the beta surface are tracked in ROADMAP.md.

Quickstart

use anthropic::types::{InputMessage, MessageCreateParams, model};

// Reads ANTHROPIC_API_KEY from the environment.
let client = anthropic::Client::from_env()?;

let response = client
    .messages()
    .create(
        MessageCreateParams::builder()
            .model(model::CLAUDE_HAIKU_4_5)
            .max_tokens(256)
            .messages(vec![InputMessage::user("Say hi in one short sentence.")])
            .build(),
    )
    .await?;

println!("{}", response.text());

Multi-turn

use anthropic::types::{InputMessage, MessageCreateParams, model};

let client = anthropic::Client::from_env()?;
let messages = vec![
    InputMessage::user("My name is Edinaldo."),
    InputMessage::assistant("Hello, Edinaldo! How can I help?"),
    InputMessage::user("What name did I just give you?"),
];
let response = client
    .messages()
    .create(
        MessageCreateParams::builder()
            .model(model::CLAUDE_SONNET_4_6)
            .max_tokens(256)
            .messages(messages)
            .build(),
    )
    .await?;
println!("{}", response.text());

Errors

All fallible operations return Result<T> (alias of Result<T, Error>). Non-2xx responses become Error::Api with the HTTP status, the parsed ErrorType, the server-supplied message, and the request-id header.

Re-exports

pub use crate::client::Client;

pub use crate::client::ClientBuilder;

pub use crate::error::Error;

pub use crate::error::ErrorType;

pub use crate::error::Result;

pub use crate::messages::MessagesService;

pub use crate::types::messages::ApiErrorBody;

pub use crate::types::messages::ContentBlock;

pub use crate::types::messages::ImageSource;

pub use crate::types::messages::InputMessage;

pub use crate::types::messages::Message;

pub use crate::types::messages::MessageContent;

pub use crate::types::messages::MessageCreateParams;

pub use crate::types::messages::Metadata;

pub use crate::types::messages::Role;

pub use crate::types::messages::StopReason;

pub use crate::types::messages::SystemPrompt;

pub use crate::types::messages::ToolResultContent;

pub use crate::types::messages::Usage;

pub use crate::types::model;

pub use crate::types::model::Model;

Modules

auth

Credential handling.

client

HTTP client for the Anthropic API.

config

Static configuration values and environment-variable resolution.

error

Error types.

http

Internal request/response plumbing.

messages

The Messages API surface.

retry

Retry policy.

stream

Streaming message responses.

types

Public data types: request bodies, response bodies, content blocks, models.