Claude — Anthropic's AI Assistant
Claude by Anthropic is an AI assistant renowned for its thoughtful, nuanced responses, exceptional coding ability, and best-in-class performance on long document analysis with a 200K token context window.
What is Claude?
Claude is an AI assistant built by Anthropic, a safety-focused AI research company founded by former OpenAI researchers including Dario and Daniela Amodei. Claude is designed from the ground up to be helpful, harmless, and honest — a philosophy Anthropic calls "Constitutional AI."
What makes Claude unique is its combination of exceptional intelligence with careful, nuanced thinking. Claude doesn't just generate text — it reasons through problems, considers multiple perspectives, and provides balanced, well-structured responses. It's particularly strong at understanding the intent behind your question, not just the literal words.
Claude supports a 200K token context window — large enough to process an entire novel, codebase, or hundreds of pages of documents in a single conversation. This makes it the go-to choice for professionals who work with large amounts of text, code, or data.
Key Features
- Massive 200K Context WindowProcess entire books, codebases, or document collections in a single conversation. Claude maintains high recall even across extremely long inputs, making it ideal for legal, research, and engineering work.
- Extended ThinkingClaude can reason through complex problems step by step before responding. This "thinking" capability dramatically improves performance on math, logic, coding, and analysis tasks.
- Best-in-Class CodingTop-tier performance on SWE-bench and other coding benchmarks. Writes production-quality code, identifies subtle bugs, designs system architecture, and works across all major programming languages.
- Safety & Honesty FirstBuilt with Constitutional AI principles. Claude is transparent about uncertainty, avoids harmful outputs, and provides balanced perspectives. It will tell you when it doesn't know something rather than making things up.
- Exceptional Writing QualityProduces nuanced, well-structured prose that reads naturally. Particularly strong at academic writing, technical documentation, long-form content, and adapting to specific editorial voices.
- Agentic CapabilitiesClaude can use tools, browse the web, execute code, and work autonomously on multi-step tasks. The Claude Code SDK enables building sophisticated AI agents for software engineering and beyond.
Available Models
Choose a Claude model to start chatting
Claude 3.7 Sonnet introduced "extended thinking" — the ability to reason through complex problems step by step...
Claude 4 Sonnet is Anthropic's newest and most capable model, delivering state-of-the-art performance in codin...