What Is Claude AI and How Does It Work? 2025 Guide
Quick answer: Claude is an AI assistant developed by Anthropic, available at claude.ai. It answers questions, writes content, analyzes documents, debugs code and holds extended conversations. Claude 3.5 Sonnet is the flagship model as of 2025, with a 200,000-token context window. Free to use with daily limits; Claude Pro costs $20/month.
Claude was built by Anthropic, an AI safety company founded in 2021 by former OpenAI researchers including Dario and Daniela Amodei. Anthropic raised over $7.3 billion and is valued at $18 billion as of 2024.
## What Can Claude AI Do?
Writing and editing: drafts emails, essays, blog posts, marketing copy, scripts and reports. Rated highest among AI assistants for long-form prose quality in independent evaluations.
Research and analysis: summarizes documents, explains complex topics and synthesizes information from uploaded files. The 200k context window allows Claude to read entire books or codebases in one session.
Coding: writes, reviews, debugs and explains code across Python, JavaScript, TypeScript, SQL and 20+ other languages.
Document analysis: extracts insights from PDFs, spreadsheets and text files uploaded directly to the conversation.
## How Is Claude Different from ChatGPT?
| Feature | Claude | ChatGPT |
|---|---|---|
| Context window | 200,000 tokens | 128,000 tokens |
| Long-form prose quality | Higher rated | Good |
| Image generation | No | Yes (DALL-E 3) |
| Web browsing | No (base) | Yes (Plus) |
| Custom GPTs | No | Yes |
| Free tier model | Claude 3.5 Haiku | GPT-4o mini |
| Pro price | $20/month | $20/month |
Claude is better for: long document analysis, nuanced writing and code review of large codebases. ChatGPT is better for: image generation, web search and custom GPT workflows.
## Is Claude AI Free?
Yes. Claude.ai offers a free tier with daily usage limits. Claude Pro ($20/month) unlocks Claude 3.5 Sonnet with higher usage limits. Claude for Work starts at $30/user/month with data privacy guarantees and no training on business data.
## FAQ: Claude AI
Q: Is Claude safe to use?
A: Claude is built with Constitutional AI, an Anthropic safety technique that trains the model to be helpful, harmless and honest.
Q: Does Claude remember previous conversations?
A: By default, Claude does not retain memory between separate conversations. Projects allow persistent context across sessions.
Q: Can Claude access the internet?
A: The base Claude models do not browse the web. Claude.ai has integrated web search in some regions and plan tiers.
Q: Who owns the content Claude generates?
A: Content you generate using Claude is yours to use. Anthropic does not claim ownership of outputs.