Definition
An on-premise LLM is a large language model whose weights are downloaded and run entirely within infrastructure controlled by the deploying organization—either physical servers in their data center or virtual machines in a private cloud tenancy. Unlike API-based access to hosted models, on-premise deployment means that no inference data ever leaves the organization's environment, providing the highest level of data sovereignty and privacy control available for LLM deployments.
Engineering Context
On-premise LLMs are required when data sovereignty, privacy regulations (GDPR, HIPAA), or security policy prohibit sending data to external API providers. Leading on-premise options: Llama 3 (70B, 405B), Mistral (7B, 8x22B), Qwen 2.5, Gemma 3. Requires significant GPU infrastructure: a 70B parameter model in FP16 requires approximately 140GB VRAM. Model quantization (INT4/INT8) can reduce this to 40GB, enabling deployment on 2x A100 80GB GPUs. Serving frameworks: vLLM, TGI, and Ollama. Organizations must also manage model updates, security patching, and operational monitoring that cloud providers handle automatically with API-based LLMs.
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