Organizations often use multiple large language models. LiteLLM — created by BerriAI in 2023 — is the open-source abstraction layer that unifies how developers connect to those models. It provides a single API compatible with over 100 providers, including OpenAI, Anthropic, Mistral, Gemini, Groq, and Ollama.
As of late 2025, LiteLLM sits at version 1.34 and is integrated into frameworks like LangChain, CrewAI, and LlamaDeploy. It’s become the de facto open standard for multi-model routing because it mirrors the OpenAI API schema — meaning developers can swap models without refactoring.
Other tools in the multi-model ecosystem include:
OpenRouter — a hosted multi-model API with unified billing.
Hugging Face TGI — inference server for open-source model hosting.
Ollama / vLLM / Groq API — optimized runtimes for local or hardware-accelerated deployment.
Together, LiteLLM and MCP bridge reasoning and action: one standardizes how agents think across many models; the other standardizes how they act across many systems.
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