What is Claude AI and what makes it unique compared to other AI assistants?

Claude is an AI assistant made by Anthropic, a safety-focused AI company founded by former OpenAI researchers. The latest family is Claude 4, which includes Claude Sonnet 4 and Claude Opus 4. You can access it at claude.ai or through the Anthropic API.

Claude is well known for its very long context window — it can read and reason over extremely long documents like entire books, legal contracts, or large codebases in a single conversation. This makes it very useful for summarization and analysis of lengthy material.

Anthropic puts a strong emphasis on honesty and safety. Claude tends to refuse harmful requests more consistently and is generally less prone to confidently hallucinating false information compared to some other models, though no AI is perfect in this regard.

For coding, Claude is considered among the best AI assistants available. Claude Code is a command-line agentic coding tool that can autonomously write, edit, test, and fix code across an entire project with minimal supervision.

Claude.ai offers a free tier and a Pro plan. For developers, the API provides access to all models. Many users find Claude better than ChatGPT for nuanced writing, careful instruction-following, and handling very large inputs in a single session.