LiteLLM Rust

This workspace contains the staged Rust implementation for LiteLLM.

litellm-core is the LiteLLM SDK in Rust: one entrypoint per top-level call that makes the LLM call and hands back a typed response, the same shape as litellm.messages() in Python.

let response = litellm_core::messages::messages(MessagesRequest {
    model: "claude-sonnet-4-5",
    body,
    api_key: Some(key),
    ..
})
.await?;

Python continues to own configuration, retries, routing policy, logging, callbacks, spend tracking, and customer plugins until each Rust path has parity coverage and production evidence.

Crates

Crate	Role
litellm-core	Provider transformations and shared types. OCR is deterministic transformation only.
litellm-runtime	Reusable OCR resolution, auth, preparation, lifecycle, HTTP, and polling.
litellm-ai-gateway	Axum and WebSocket host plus host-specific OCR logger/guardrail adapters.
litellm-python-bridge	PyO3 cdylib. Calls runtime directly for OCR and retains gateway for unrelated legacy paths.

Dependency direction (acyclic): ai-gateway/python-bridge -> runtime -> core.

Layout

crates/
  core/           Shared types and provider transformations.
    src/messages/   Legacy whole-call route implementation.
    src/providers/anthropic/messages/transformation.rs
  runtime/        Reusable OCR execution.
  ai-gateway/     Axum server + WebSocket hosts; adapts OCR runtime hooks.
  python-bridge/  PyO3 bridge for Python LiteLLM.

The folder shape follows the Python provider tree: core/src/providers/<provider>/<route>/transformation.rs. The bridge exposes one function per top-level route, calling the matching core or runtime entrypoint.

Checks

Run these before pushing Rust changes. GitHub Actions runs the same checks for changes under litellm-rust/.

cargo fmt --check
cargo clippy --workspace --all-targets -- -D warnings
cargo test --workspace

1.9 KiB Raw Permalink Blame History

LiteLLM Rust

Crates

Layout

Checks

1.9 KiB

Raw Permalink Blame History