What’s the difference between Llama 2 7B, 13B, and 70B?

Llama 2, an open-source language model developed by Meta AI, is designed to outperform other open-source models in various benchmarks like reasoning and coding. It is available in three main variants—7B, 13B, and 70B parameters—each tailored for different performance and resource needs. Llama 2 has been fine-tuned into "chat models" for specific tasks and is supported by platforms like Replicate, which allows users to run these models with ease. The 70B model offers the highest accuracy for chatbot applications, while the 13B and 7B models provide faster and more cost-effective alternatives with slight trade-offs in accuracy. In addition to the chat models, base models are available for other language tasks, such as code completion and classification. The Llama 2 ecosystem is expanding rapidly, with ongoing developments and support from partners like Andreesen Horowitz. Users can experiment with these models using tools like Vercel’s AI Playground and can fine-tune them through platforms like Replicate, which facilitates running machine learning models in the cloud.