ChatGPT vs Glean

ChatGPT is OpenAI's conversational AI assistant and the most widely used AI product in the world. Launched in November 2022, it answers questions, writes and edits text, analyzes files, spreadsheets and images, generates images, searches the web with citations, runs code in a sandbox and produces multi-step research reports with Deep Research. Voice mode supports natural spoken conversation, and apps are available on web, desktop and mobile.

Projects group chats and files around a topic, memory lets ChatGPT remember preferences across conversations, and custom GPTs let anyone package instructions, knowledge and tools for a specific task. Agent mode, introduced in 2025, can operate a virtual browser to complete multi-step tasks such as research, form filling and comparison shopping. The free plan gives limited access to OpenAI's GPT-5 family of models; Plus raises limits and unlocks advanced features, Pro offers the highest limits, and Business (called Team until August 2025) and Enterprise add a shared workspace, admin controls, SSO and a commitment not to train models on business data.

ChatGPT is the default general-purpose assistant for individuals and companies, strong on breadth of features and integrations. Answers can still contain errors, so important facts need checking, and usage limits apply even on paid plans. Claude is often preferred for long documents, writing and coding, Gemini integrates tightly with Google Workspace, and Perplexity focuses on cited search answers.

Glean is an enterprise work AI platform that indexes a company's apps, documents and conversations and lets employees search, ask questions and run agents over that knowledge. It was founded in 2019 in Palo Alto by former Google search engineer Arvind Jain, who previously co-founded Rubrik, and it raised a $150 million Series F at a $7.2 billion valuation in June 2025.

The platform has three layers: Glean Search, a ranked enterprise search; Glean Assistant, a chat assistant grounded in company data; and Glean Agents, which automate multi-step work from natural-language instructions. Underneath sit 275+ connectors, an Enterprise Graph that maps people, content and activity, and permission enforcement that mirrors each source system in near real time. It also offers APIs and MCP support. Pricing is not published; it is sold per seat through sales, with demos instead of a self-serve trial.

Glean fits large organizations with knowledge scattered across Slack, Google Drive, Confluence, Jira, Salesforce and code hosts. It is overkill and likely too costly for small companies, and results depend on clean permissions in source systems. Microsoft 365 Copilot is the natural rival for Microsoft-centric firms, ChatGPT Enterprise offers broader general AI with connectors, and Notion AI covers search well if Notion is already your wiki.

Glean announced in December 2025 that its annual recurring revenue had passed $200 million, doubling in nine months. When evaluating, run a pilot on your messiest knowledge sources and test permission boundaries with a few restricted documents.