The authentication credential that allows your application to call the Claude API, formatted as a long string starting with `sk-ant-`. Each API Key is linked to an Anthropic account; the system uses it to identify who is making requests, calculate billing, and apply corresponding usage limits. Must be kept secure — leaking it allows others to call the API at your expense.

An experimental Anthropic feature that lets Claude "look at a screen and operate a computer" like a human — moving the mouse, clicking buttons, typing text, taking screenshots to observe results. Without requiring API integration, Claude can directly operate any application with a graphical interface. A significant breakthrough in AI Agent capability.

Anthropic's enterprise-tier Claude subscription for large organizations, including higher usage quotas, centralized management with SSO integration, guarantee that data won't be used for training, and priority support SLA. Suited for organizations needing large-scale AI deployment with compliance and data security requirements.

A Claude.ai workspace feature for creating conversation spaces with fixed Instructions (system prompts) and uploaded documents. Every new conversation opened within a Project automatically carries these settings without needing to re-establish context. Particularly suited for workflows with repetitive tasks and fixed context requirements.