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Perplexity AI is an American web search engine that leverages large language models (LLMs) to process user queries and synthesize responses. Unlike traditional search engines, Perplexity aims to provide direct, accurate, and real-time answers, often citing its sources directly. It functions as an AI-powered answer engine, designed to cut through clutter and deliver credible, up-to-date information. The platform is versatile, serving as a tool for answering questions, learning new skills or concepts, and conducting in-depth research. It offers various underlying models, including a lightweight, cost-effective search model for quick, grounded answers, and an offline chat model that provides local AI capabilities without requiring internet search. Perplexity also integrates advanced third-party AI models like OpenAI's GPT-4 Omni and Anthropic's Claude 3.5 Sonnet & Haiku for its premium users. Perplexity is accessible across multiple platforms, including a web application, and dedicated mobile apps for Android and iOS. It also offers a developer API, notably including its proprietary 'Sonar' models, allowing external applications to integrate Perplexity's AI search capabilities. The service operates on a freemium model, offering a free plan with core features and a 'Pro' subscription for enhanced capabilities.

Mistral is a family of powerful large language models (LLMs) developed by the French AI startup Mistral AI. These models are designed for a wide range of generative AI tasks, excelling in areas such as high-complexity reasoning, knowledge acquisition, and coding capabilities. Mistral AI emphasizes efficiency and performance, with their models often outperforming larger competitors like Llama 2 on various benchmarks. The Mistral models cater to diverse needs, ranging from compact, efficient versions suitable for cost-effective deployments to top-tier models for state-of-the-art performance. They are capable of instruction following, conversational assistance, and can be integrated into various applications. The company also offers specialized models, including those for multimodal tasks like image processing. Accessibility is a key focus, with Mistral models available through their API services, allowing developers to customize, fine-tune, and deploy AI assistants and autonomous agents. Mistral AI has also launched a mobile AI assistant called "Le Chat," making their language models accessible on iOS and Android devices, offering features like multilingual conversation, image generation, and real-time web searches.

Microsoft Copilot is an advanced AI-powered virtual assistant developed by Microsoft, designed to be an everyday AI companion for individuals and organizations. It leverages the power of the latest OpenAI models, including the GPT-4 series of large language models, to provide a wide range of capabilities. Copilot integrates seamlessly across various Microsoft platforms, including Windows, macOS, and mobile devices (iOS and Android), as well as within Microsoft 365 applications like Word, Excel, PowerPoint, Outlook, and OneNote. Its core functionality revolves around enhancing productivity and creativity by assisting with tasks such as deep research, content generation (text and images), summarizing documents, creating presentations, analyzing data, and managing emails. The model is designed to offer a versatile AI experience, from straightforward answers and advice to more complex generative tasks. It aims to streamline workflows, save time, and empower users to learn, grow, and communicate with confidence, making advanced AI assistance accessible wherever users work or create.