LiteLLM provides a unified interface for calling 100+ different LLM providers.

Key capabilities:
- Translate requests to provider-specific formats
- Consistent OpenAI-compatible responses
- Retry and fallback logic across deployments
- Proxy server with authentication and rate limiting
- Support for streaming, function calling, and embeddings

Popular providers supported:
- OpenAI (GPT-4, GPT-3.5)
- Anthropic (Claude)
- AWS Bedrock
- Azure OpenAI
- Google Vertex AI
- Cohere
- And 95+ more

This allows developers to easily switch between providers without code changes.