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LiteLLM

API Tool Free

Unified OpenAI-shaped API over 100+ LLM providers. SDK or proxy mode, with cost tracking, fallback, and virtual keys.

Key features

100+ providers
OpenAI-compatible
Cost + spend tracking
Proxy with virtual keys

Pros

Swap providers without code changes
Production-ready proxy
MCP + A2A support

Cons

Another layer to operate
Proxy adds latency for low-scale use

llm-gatewayproxyroutingobservability

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