Brex AI

Brex AI is a proactive AI assistant tool. Brex AI adds named agents to the Brex spend platform: an assistant that handles employee expenses and policy questions, plus audit and review agents that enforce uploaded policy, approve low-risk spend and flag anomalies.

Brex AI is the agent layer inside the Brex spend platform. Rather than a single chatbot bolted onto a card product, it is a set of named agents that each own a slice of the finance workflow: Brex Assistant for employees, an Audit Agent for monitoring, and a Review Agent for approvals. The pitch is straightforward. Categorization, receipt chasing, memo writing and policy checks stop sitting in a queue and start happening on their own, using rules the company supplies. Brex Assistant is the employee-facing piece. It writes expense memos, fetches missing receipts, answers policy questions at any hour and can file reimbursements without a human walking through a form. That last detail matters more than it sounds: most of the friction in expense reporting is not the accounting, it is the employee who does not know whether a purchase is allowed. The assistant absorbs those questions so finance teams field fewer interruptions. The Audit and Review Agents are the controller-facing half. You upload an expense policy and can edit it at any time; the agents then enforce it everywhere. The Review Agent approves low-risk expenses and requests, escalates exceptions and follows up with people who are out of compliance. The Audit Agent watches spend continuously, sorts potential violations by risk level and flags anomalies or abuse. Training is iterative: you give the agents your policy and standard operating procedures, then correct them as they work, and precision improves over time. An insights layer answers plain questions such as how much was spent on meals or which costs were trip related. This is aimed at finance and accounting teams at companies already running spend through Brex, especially those small enough that hiring another controller is not realistic. It is not a standalone tool you buy separately from the card and spend management product, so the comparison set is other spend platforms with AI review rather than generic accounting assistants. Brex cites Plaid, SeatGeek and Cluely as customers seeing faster categorization, automated GL coding and automated bill pay.