Interpreter is a desktop agent designed to facilitate interaction with and manipulation of various document types through AI-driven capabilities. It provides integrated, AI-native editors for Word, Excel, and PDF documents, allowing users to either directly edit files or issue natural language commands for the agent to execute.

The core methodology of Interpreter involves leveraging large language models (LLMs) to understand user requests and perform complex document-centric tasks. For PDF forms, it enables instant filling for both interactive and non-interactive formats, potentially extracting data from other files or images. For Excel, it functions as an "AI-native Excel replacement," supporting advanced features like pivot tables, charts, and formulas, with the ability to pull data from documents with working formulas and assist in building dashboards and financial models. The Word editor is a "fully featured" tool with AI built in, supporting tracked changes, formatting, and embedded images, and can transform content, such as turning transcripts into notes or slide decks. Beyond specific document types, the agent can perform broader tasks like querying information across multiple PDFs to identify patterns, generating formatted expense reports from receipts, and managing files through organization and batch renaming.

Users can integrate various AI models with Interpreter. The system supports direct API key integration for major LLM providers including OpenAI, Anthropic, Groq, and OpenRouter. Additionally, it allows for offline operation by running local models via Ollama. For users without API keys, a free tier option is available through login with an existing OpenAI (ChatGPT) account, while the paid plan ($20/month) offers Interpreter-managed models, eliminating the need for user-provided API keys. A custom tier provides enterprise-level features including compliance and dedicated support.

Regarding data privacy, local model usage via Ollama ensures data remains on the user's device. When users provide their own API keys, data transmission occurs directly between the user's device and the respective AI provider, bypassing Interpreter's servers. For hosted models managed by Interpreter, requests are routed through their servers and logged for a period of up to 30 days, adhering to their privacy policy.