In this work, we develop and release Llama 2, a collection of pretrained andfine-tuned large language models (LLMs) ranging in scale from 7 billion to 70billion parameters. Our fine-tuned LLMs, called Llama 2-Chat, are optimized fordialogue use cases. Our models outperform open-source chat models on mostbenchmarks we tested, and based on our human evaluations for helpfulness andsafety, may be a suitable substitute for closed-source models. We provide adetailed description of our approach to fine-tuning and safety improvements ofLlama 2-Chat in order to enable the community to build on our work andcontribute to the responsible development of LLMs.
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