How to Use Claude: Complete Beginner's Guide (2026)

Claude is an AI assistant made by Anthropic, a company focused on AI safety. Claude is available as a chat interface at claude.ai, as a mobile app, and as an API for developers. It excels at coding, writing, analysis, and following complex instructions.

Claude is known for being more thoughtful and nuanced than competitors. It will sometimes push back on requests, ask clarifying questions, or suggest better approaches — behaving more like a knowledgeable colleague than an obedient assistant. This makes it particularly valued for professional work where quality matters more than speed.

claude.ai (Web & Mobile) — Visit claude.ai to start chatting immediately. Create a free account with your email or Google account. The free tier gives you limited daily messages with Claude Sonnet. Upgrade to Claude Pro ($20/month) for more messages and access to Claude Opus.

Claude API — For developers building applications. Sign up at console.anthropic.com to get an API key. The API supports text, images, tool use, and streaming. Pricing is per-token — check our pricing calculator for estimates.

Claude Code (CLI) — Anthropic's terminal-based coding agent. Install with npm install -g @anthropic-ai/claude-code. It works directly in your codebase, creating and editing files, running commands, and iterating on complex tasks. This is Claude's killer feature for developers.

Claude Opus 4.6 — The most capable model. Best for complex reasoning, coding, and tasks requiring deep understanding. More expensive and slightly slower. Use for: software development, research, complex analysis, important writing.

Claude Sonnet 4.6 — The best balance of capability and speed. Excellent for most tasks at a fraction of Opus pricing. This is the default model on the free tier. Use for: everyday tasks, quick coding, content creation, chat.

Claude Haiku 4.5 — The fastest and cheapest model. Ideal for simple tasks at high volume. Use for: chatbots, classification, simple Q&A, data extraction.

See our model rankings for detailed benchmark comparisons across all Claude models.

Coding & Software Development — Claude leads all major coding benchmarks (SWE-bench, HumanEval). Claude Code enables autonomous multi-file editing. It's the top choice for professional developers. See coding rankings →

Writing & Content — Claude produces more nuanced, varied prose than competitors. It avoids common AI writing patterns (like starting every paragraph the same way) and can match specific brand voices. See writing rankings →

Analysis & Research — Claude's 200K context window can process entire books. Its extended thinking feature breaks down complex problems step by step. Excellent for data analysis, literature reviews, and strategic planning.

Structured Data Tasks — Claude excels at JSON output, data extraction, classification, and formatting. It follows output format instructions more precisely than most competitors.

Use XML tags for structure. Claude responds exceptionally well to XML-tagged prompts: <context>...</context>, <instructions>...</instructions>, <examples>...</examples>. This helps Claude parse complex prompts reliably.

Enable extended thinking. For complex reasoning, enable extended thinking to let Claude work through problems step by step before responding. This dramatically improves accuracy on math, logic, and analysis tasks.

Be specific about format. Tell Claude exactly what you want: "Respond with a JSON object," "Use markdown with headers," "Write exactly 3 bullet points." Claude follows format instructions very precisely.

Provide context about your expertise. Claude adapts its explanations to your level. Saying "I'm a senior software engineer" vs "I'm new to coding" will produce very different responses to the same technical question.

Use artifacts for code and documents. When asking Claude to create code, documents, or other standalone content, it will use "artifacts" — a separate panel that makes it easy to copy, iterate, and download the output.

Free tier — Limited daily messages with Claude Sonnet. Good for trying Claude and light usage.

Claude Pro ($20/month) — More messages, priority access, Claude Opus access, and extended thinking. Best for individuals who use Claude regularly.

Claude Team ($25/user/month) — Shared workspace, admin controls, higher limits. Best for small teams.

Claude Enterprise — SSO, SCIM, extended context, custom retention. Contact Anthropic for pricing.

API pricing — Pay per token. Haiku is cheapest (~$0.25/M input), Sonnet is mid-range, Opus is premium. Use our pricing calculator to estimate costs for your usage pattern.