Claude

What is Claude?

Claude is a large language model (LLM) and AI assistant developed by Anthropic. Founded in 2021 by former OpenAI employees — including Dario and Daniela Amodei — Anthropic has established itself as a leading AI company with a valuation exceeding $60 billion (2025).

What sets Claude apart: a special focus on safety (Constitutional AI), one of the largest context windows on the market (up to 1 million tokens), and outstanding reasoning on complex tasks.

The Claude Model Family

Claude Opus 4 is the most powerful model — Anthropic's flagship for the most demanding tasks. It outperforms GPT-4o on many benchmarks for complex reasoning, coding, and long-form analysis.

Claude Sonnet 4 offers the best balance of performance and speed — fast enough for interactive use, powerful enough for demanding tasks.

Claude Haiku is the fastest and most affordable model — ideal for high throughput and batch processing.

Claude Code

Claude Code is Anthropic's CLI tool for AI-powered software development. It runs directly in the terminal and can write code, edit files, run tests, and automate Git workflows. For developers and AI implementation, Claude Code is a game-changer.

Claude vs. ChatGPT vs. Gemini

Compared to ChatGPT, Claude excels at long documents, nuanced reasoning, and code quality. ChatGPT has the larger ecosystem. Gemini is stronger through Google integration, while Claude offers the best text quality and largest context window.

The Anthropic API

The Claude API offers pay-per-use access to all models. Key features for businesses: Messages API with Tool Use, Batch Processing, and Prompt Caching (up to 90% cost savings). The Agent SDK enables building autonomous AI agents.