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Anthropic is the AI company behind Claude, a family of large language models known for strong reasoning, long context windows, and a focus on safety. UK developers use the Claude API to build AI features — summarisation, coding assistants, customer support — with a developer-friendly API and generous context (up to 200k tokens). The Claude family includes Haiku (fast/cheap), Sonnet (balanced), and Opus (most capable). Pricing is per-token, with free tier credits available. GDPR-compliant data handling options exist for business users. For UK startups building on frontier LLMs, Claude is a leading choice alongside OpenAI.