Claude is Anthropic’s AI assistant, known for careful reasoning, excellent writing quality and professional-grade coding. The 2026 line-up includes Sonnet 5, Opus 5 and Haiku 5.5 models with context windows of up to 1M tokens, plus the Claude Code terminal agent and integrations with Microsoft 365 and Google Workspace.
The free plan covers everyday chat with usage limits; Pro at $20/month unlocks Claude Code, Projects and priority access, while Max tiers ($100 and $200/month) multiply usage 5x or 20x for heavy daily users.