According to Anthropic on X, the team used Claude to interview 69 employees about items they wanted to buy and sell, collected custom instructions for each participant, and then deployed agents to haggle across four parallel markets to test how different model variants negotiated. As reported by Anthropic, the controlled setup isolates the impact of model choice on price discovery, concession patterns, and deal completion rates, offering a practical benchmark for multi-agent negotiation performance. According to Anthropic, this design enables businesses to evaluate which Claude versions yield better transaction outcomes, faster time to deal, and improved surplus capture in marketplace, procurement, and sales automation use cases.