Claude is Anthropic's AI assistant, available on the web at claude.ai, on iOS and Android, and as a desktop application — making it one of the most accessible frontier-model AI tools for everyday users. Its design philosophy centers on being genuinely helpful, harmless, and honest, which means it pushes back, asks for clarification, and admits uncertainty rather than confidently hallucinating. The key mental model for getting value from Claude is thinking of it as a persistent collaborator rather than a search engine: the more context you provide — through Projects, instructions, and uploaded files — the more useful and consistent its output becomes across sessions.
What This Cheat Sheet Covers
This topic spans 19 focused tables and 127 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Plans and Pricing
Claude offers five tiers for individuals and organizations, each with distinct usage capacities and features. Choosing the right plan determines how much you can do per session, whether you get Claude Code access, and whether your data trains future models by default.
| Plan | Example | Description |
|---|---|---|
claude.ai — no credit card required | • Gives limited daily usage • good for occasional queries but hits caps quickly on long sessions • No data training opt-out by default | |
20/month or 200/year | • Standard usage (~44K tokens per 5-hr window) • includes Claude Code, Projects, all models, and priority access during peak hours | |
$100/month | • 5× Pro session capacity (~88K tokens/window) • same features as Pro, designed for frequent daily users who hit Pro limits |