Claude

Claude (by Anthropic) is OpenAI's main competitor. It is famous for its large context window (200k+), low hallucination rates, and "Artifacts" UI.

When to Use

• Coding: Claude 3.5 Sonnet is widely considered the best coding model in 2025.
• Long Context: Analyzing massive PDFs or codebases.
• Safety: Enterprise-grade safety guardrails.

Core Concepts

Models

• Opus: The smartest, largest model.
• Sonnet: The sweet spot. Fast and incredibly capable.
• Haiku: Fast and cheap.

Artifacts