No. The developer pays the buyer agent's compensation, and the price sheet is the same price sheet whether you walk into the sales gallery alone or with representation. Buying directly from the developer's team does not earn you a discount; it removes the one person in the transaction whose job is your side of it.
What representation adds: knowledge of how this developer's past projects actually delivered, which lines and floors in the building hold value, how this project's contract compares to the market, and negotiation on the terms that are negotiable, which is more than the gallery lets on.
The one rule that matters: the developer's registration policies generally require your agent to be with you from the first contact. Register together at the start and the representation costs you nothing for the life of the deal. Rangely covers projects from Miami up to Fort Lauderdale and is registered with developer sales teams across the pipeline.