Claude

Claude is a suite of large language models (LLMs) that operate as AI assistants focused on safety, interpretability, and extended context handling. Its foundation is a Constitutional AI framework that embeds explicit ethical principles into behavior, guiding responses toward helpfulness, honesty, and harmlessness.

Anthropic designs Claude models across tiers—Haiku (fastest), Sonnet (balanced), and Opus (flagship)—catering to use cases from quick tasks to complex reasoning and coding. Recent models support up to one‑million‑token context windows for deep document processing and long‑form work. Claude can function autonomously in agent‑style workflows including planning, tool usage, and coding.

• Constitutional AI alignment: Claude is trained to follow an explicit ethical “constitution,” prioritizing safe, honest behavior instead of overreliance on human feedback — increasing reliability and transparency.
• Tiered model architecture (Haiku, Sonnet, Opus, plus Mythos/Fable): Users select based on task complexity—Haiku for speed, Sonnet for general use, Opus for deep reasoning, and Mythos/Fable for scientific or vision‑enhanced tasks.
• Ultra‑long context windows: Supports up to one‑million‑token context (beta), enabling coherent analysis of entire novels, research reports, or extensive codebases in a single session.
• Agentic coding with Claude Code: CLI/IDE integrated agent that reads, edits, debugs, and runs code autonomously, enabling streamlined development workflows.
• Claude Science workbench (beta): A purpose‑built environment for scientific workflows, consolidating research tools like Jupyter, terminals, and literature access into one interface.

• Software developers / engineers: Use Claude Code for autonomous code generation, debugging, and project navigation within terminal or IDE.
• Knowledge workers and analysts: Leverage Opus or Sonnet for processing long documents, reports, or legal/financial materials with high context retention.
• Researchers and scientists: Use Claude Science to integrate scientific workflows and tools, reducing fragmentation in research pipelines.
• Enterprises / technical teams: With Team, Max, or Enterprise tiers, gain administrative controls, secure deployment, and extensive usage capacity for agents and reasoning workflows.

• Visit claude.ai or download desktop/mobile app; sign up for Free, Pro, Max, or Enterprise plan.
• Select model tier: Haiku, Sonnet, Opus, or access agentic tools like Claude Code or Claude Science.
• For chat-based tasks: input prompt—Claude reasons using its model and applies Constitutional AI principles to produce outputs.
• For code workflows: activate Claude Code in terminal/IDE; it analyzes context, suggests edits, runs tests autonomously.
• For scientific workflows (beta): launch Claude Science workbench to access consolidated research tools via Claude’s interface.
• Receive output: document summaries, code snippets, plans, or scientific insights. Claude may cite sources or indicate uncertainty when using web search tool.

Claude uses tier-based pricing logic. It offers a Free plan, Pro subscription for standard usage, and Max tier in two multipliers (5×, 20×) for power users. Enterprise option provides custom pricing and administrative features. Access to models scales with plan: Free includes Sonnet with daily limits; Pro unlocks Sonnet and Opus, higher usage, and agent tools; Max multiplies usage capacity and priority. API pricing is token-usage based via model tier and includes batch and speed discount options.