How they differ in practice.
Search and a connected graph answer different kinds of questions. The difference shows up as soon as the answer needs more than one system.
Glean finds the right document
Glean indexes documents, wikis, chat, and tickets across your company and ranks the most relevant results for a person or an assistant. It is built for questions like "where is the security policy" or "what did we decide about pricing last quarter".
SixDegree resolves the business
SixDegree reads the systems of record themselves, such as Salesforce, Zendesk, Stripe, and product analytics, and resolves the same customer, deal, or service across them. Each fact keeps its source and the time it was observed.
That supports questions like "which renewals this quarter have an open P1 and falling usage", where the answer is a set of accounts with evidence, not a list of documents.
An example
Ask both tools why the Meridian renewal is at risk. Search can return the account plan, a few Slack threads, and a QBR deck. SixDegree returns the account itself: renewal date and value from the CRM, two open escalations from Zendesk, a 30 percent usage drop from product analytics, and a changed invoice amount from Stripe, each linked to its record.