Copilot knows your company. Rhizome knows your regulator.
Copilot is the AI your IT department already rolled out to a thousand people. You can rely on it to find emails, you can't rely on it to find precedents.
How they differ
Your tenant vs the public record. Copilot's design center is your data: SharePoint, Teams, Outlook, the deck from last quarter. Grounding in the tenant is the feature Microsoft sells, and for internal knowledge work it's genuinely useful. But point it at a regulatory question and the same design works against you: it keeps pulling your own information back when what you need is what FDA, EMA, or MHRA actually said. The frustration buyers describe is exactly that: I don't want my documents again. I want what the rest of the world is thinking.
Rhizome is built on the outside world: >45 million documents across >75 health-authority databases in >12 markets (as of August 2026) — approvals, reviews, guidances, trials, enforcement — ingested down to the line and the scanned image. A hard question reads hundreds of those sources, sometimes thousands, and comes back with every claim cited to the exact passage.
The standardization logic — and its limit. Rolling one AI out to everyone is rational: one governance review, one training effort, one vendor. IT is right to want it. The mistake is treating the interface decision as a corpus decision: standardizing on Copilot doesn't put the health-authority record inside your tenant, and no amount of prompt skill fixes a corpus that isn't there.
The good news is you don't have to choose. Rhizome connects to Copilot over MCP: your team keeps the assistant they were trained on, and the regulatory research runs through an agent grounded in the primary record. You get most of the value without asking a thousand people to open a new tab, and the ones doing serious precedent work can go direct.
Nothing from memory. For everyday work, a plausible answer is fine. For a position you'll defend to a regulator, plausible is the problem: poor advocacy can harden a reviewer's position, and a citation that doesn't survive the click ends the trust right there. Rhizome's agents can only state facts pulled from primary-source documents (memory doesn't count as a source), and we benchmark them on that discipline. No hallucinations reported in 18 months; the passage-level citations are there so you never have to take that on faith.
Traceability. Copilot cites your files and web pages. Rhizome cites the exact passage of the exact filing: click it and you're reading the lines it came from, not skimming a 500-page review hoping to find them.