Claude AI is a family of advanced large language models developed by Anthropic, an AI safety and research company. These models, including high-performance versions like Opus and cost-efficient ones like Sonnet, are designed to be helpful, harmless, and honest. They operate on principles of Constitutional AI, using a set of guiding principles to steer their behavior and responses. Claude's architecture includes a remarkably long context window, allowing it to process and recall vast amounts of information within a single interaction, making it highly effective for complex tasks.