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RAG Explained: What Is Retrieval-Augmented Generation?

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It can be used for RAG by orchestrating calls to Azure Cognitive Search (a vector search service) and an LLM (like Azure OpenAI Service). For example, Vectara and Azure OpenAI with Cognitive Search allow you to send a query and get an LLM answer grounded in data youve indexed with them.

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Top LLMs in 2025: Best Large Language Models for AI, SaaS & Development

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In practice, GPT-4 powers ChatGPT , GitHub Copilot , and countless SaaS integrations. Developers access GPT-4 via OpenAIs API or ChatGPT ecosystem, using prompt engineering and fine-tuning. Data scientists can run Llama 3 on-premise or via cloud partners like AWS Bedrock, Azure, IBM, etc.