LLM stands for **Large Language Model**, a type of artificial intelligence designed to process and generate human-like text. These models are trained on vast amounts of data and can perform tasks like answering questions, summarizing information, translating languages, and even writing code.
As for the best LLM apps 2025, here are some of the top ones in 2025:
The "most advanced" large language model (LLM) today depends on your criteria—general intelligence, speed, context length, safety, or openness. Here’s how the top contenders stack up:
OpenAI GPT-4 Turbo / GPT-4o / GPT-5
OpenAI is an American artificial intelligence organization founded in December 2015 and headquartered in San Francisco, California. Its mission is to develop "safe and beneficial" artificial general intelligence (AGI)—highly autonomous systems that can outperform humans at most economically valuable work.
Anthropic Claude 3 Opus / Claude 3.7 Sonnet / Claude 4
Claude 3 Opus is praised for its ethical design, advanced reasoning, and extended context handling (up to 200K tokens). The latest versions focus on deliberate reasoning and excel in coding, summarization, and business automation.
Google Gemini Ultra / Gemini 2.5 Pro / Gemini 1.5 Pro
Gemini models are fully multimodal, handle up to 1 million tokens in context, and have real-time knowledge access. Gemini Ultra leads many benchmarks, especially in multitask language understanding and complex reasoning.
xAI Grok-2
Grok-2 is tailored for real-time insights and social media analysis, making it a strong choice for trend analysis and content personalization.
Meta Llama 3 / Llama 4
Llama 3.3 and Llama 4 (Scout) are open-source, multimodal, and offer very large context windows (up to 10 million tokens in preview). They are highly customizable and popular for both research and commercial use.
DeepSeek R1 / V3
DeepSeek models are notable for their large parameter sizes (up to 671B), strong reasoning, and high efficiency, all while being open-source and accessible via API.
Perplexity
Perplexity is an AI-powered answer engine and search platform developed by Perplexity AI, Inc., an American software company founded in 2022. This tool provides accurate, real-time answers to any user query by leveraging state-of-the-art large language models and live web search.
Key features of Perplexity include:
Conversational Answers: Allows natural, follow-up questions for deeper exploration and understanding.
Citations for Every Answer: Every result is backed by sources for verification.
Multi-Model Access: Users can utilize various language models such as GPT-4, Claude 4, Gemini, and Perplexity’s own models Sonar and R1 1776.
Perplexity Pro: A premium subscription that unlocks advanced models, file and web search integration, and features like Labs (complex project generation) and Internal Knowledge Search (simultaneous search across web and uploaded documents).
Mobile and Desktop Apps: Available on iOS, Android, Windows, and as a browser extension, with seamless syncing across devices.
Privacy and Data Control: Users can choose not to have conversations contribute to model training, while still accessing their own conversation history for reference
Cohere Command R+
Known for retrieval-augmented generation (RAG) tasks and enterprise use, Command R+ offers strong performance and open-source flexibility.
These models are shaping the future of AI, making interactions more natural and intelligent.