Microsoft Copilot supports file uploads across personal, business, and enterprise environments, allowing users to submit documents, spreadsheets, presentations, PDFs, and images for extraction, summarization, and structured interpretation. In late 2025 these capabilities differ depending on whether the user interacts with Copilot Chat, Copilot inside Word, Excel, or PowerPoint, or custom agents built with Copilot Studio. File-size limits, behavioral rules, storage locations,

xAI positions Grok 4 Heavy as its top-tier model for users who require high-bandwidth reasoning, multi-agent orchestration, larger context windows, and priority compute. The pricing structure combines premium monthly subscriptions for individual users with token-based billing for developers, and negotiated tiers for enterprise-scale workloads. Grok 4 Heavy sits at the top of this ecosystem, offering the richest capabilities but also the highest recurring cost. ····· ..... Gro

Claude Opus 4.5  and Sonnet 4.5  represent the two most important tiers in Anthropic’s frontier model lineup, designed to handle everything from high-volume production workloads to the most complex reasoning tasks requiring deep analysis, large-context comprehension and multi-step logic. Although they share the same generation family and many architectural similarities, their differences in capability, price, performance-per-token and enterprise scaling determine which model