Large Language Model
What is it?
Large Language Models are neural networks with billions to trillions of parameters, trained using self-supervised learning on diverse text corpora. They learn statistical patterns in language and can perform a wide range of tasks including writing, coding, reasoning, and analysis without task-specific training. LLMs are typically based on the Transformer architecture and trained using next-token prediction. Fine-tuning and RLHF (Reinforcement Learning from Human Feedback) are commonly used to align LLMs with human preferences and safety guidelines. As of 2026, LLMs power most commercial AI assistants and are being integrated into enterprise workflows globally. The rapid scaling of these models has led to emergent capabilities that were not explicitly trained, including complex reasoning, code generation, and multilingual understanding.
How it works
LLMs use autoregressive training: predicting the next token given all previous tokens. The model learns to maximize P(token_n | token_1, …, token_n-1). Scale is critical: performance improves predictably with more parameters, data, and compute following scaling laws. Modern LLMs use techniques like grouped query attention, rotary position embeddings, and mixture of experts to improve efficiency. Context windows have expanded from 2K tokens to over 100K tokens. Training requires distributed computing across thousands of GPUs using data and model parallelism.
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