Claude

Freemium | Paid | Essential AI

Overview

Claude is an AI assistant built by Anthropic, a safety-focused AI company founded in 2021 by Dario Amodei, Daniela Amodei, and other former OpenAI researchers. Unlike tools that optimize purely for capability, Anthropic designed Claude with a Constitutional AI framework — making it one of the most thoughtful, reliable assistants for high-stakes work. Claude is used by millions of individuals, developers, and enterprises worldwide. Claude is available on web, desktop, iOS, and Android via claude.ai, and through a powerful API on AWS Bedrock and Google Cloud Vertex AI. The current model family includes Claude Haiku 4.5 (fast and cost-efficient), Claude Sonnet 4.6 (the balanced workhorse), and Claude Opus 4.6 (the most capable flagship). All models support a 200K token context window, with 1M context available on Opus 4.6 and Sonnet 4.6 at standard pricing as of March 2026. What sets Claude apart is extended thinking mode, which lets it reason step-by-step through complex problems, and Claude Code, which handles agentic software development. Anthropic reports Claude Code now writes the vast majority of its own internal engineering code. Claude also supports computer use — completing tasks autonomously on your actual computer — making it one of the most capable AI execution environments available in 2026.

Features

  • Extended thinking mode -- Shows step-by-step reasoning on complex math, logic, and analysis tasks before delivering answers
  • 200K token context window -- Process entire codebases, legal contracts, or long documents in a single conversation
  • Claude Code -- Agentic software development mode that reads, writes, and edits code autonomously
  • Computer use -- Claude navigates browser interfaces and desktop apps to complete multi-step tasks on your computer
  • Constitutional AI -- Safety framework built into training rather than bolted on, giving Claude consistent, principled behavior
  • Projects -- Persistent workspaces that maintain context, custom instructions, and documents across conversations
  • Cross-platform availability -- Web, desktop app (Mac/Windows), iOS, and Android with seamless sync
  • Memory across conversations -- Remembers relevant context from past sessions and updates automatically
  • Multi-modal analysis -- Analyze images, PDFs, documents, and data files alongside text
  • Web search -- Real-time web access for up-to-date research and fact-checking
  • Claude API -- Full programmatic access for developers building on top of Claude in apps and pipelines
  • Artifacts -- Create standalone documents, code, and visualizations that update as you refine the conversation
  • 1M context window -- Opus 4.6 and Sonnet 4.6 support 1M token context at standard pricing
  • Deep Research mode -- Multi-step autonomous research that synthesizes findings across sources into structured reports

Best For

Developers and engineers who want an AI pair programmer with agentic coding capabilities, Knowledge workers who regularly process long documents, contracts, and complex research, Businesses and teams looking for a safe, reliable AI that performs well on nuanced analysis, Content creators and writers who need an AI that produces natural, reasoning-grounded prose, Organizations integrating AI into products via API with strong safety and reliability requirements

How It Works

Claude operates through a Constitutional AI training approach, giving it internalized values and principles that guide its behavior without requiring explicit rules for every scenario. When you send a message, Claude reasons through context, identifies the most helpful response, and applies safety principles to avoid harmful outputs. Extended thinking mode enables Claude to show its reasoning process step-by-step before answering, which improves accuracy on math, logic, and multi-step analysis tasks. Projects let you maintain persistent context across conversations, store instructions, and build ongoing working relationships with Claude on specific domains. Claude Code is a specialized agentic mode for software development. It reads codebases, writes and edits files, runs tests, and completes multi-step engineering tasks autonomously. Computer use extends this further, allowing Claude to navigate browser interfaces and desktop applications to complete tasks on your behalf. Memory across conversations (available to all plans as of early 2026) lets Claude retain relevant context from past sessions automatically.

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