Ramp published an updated AI index on September 9, 2026, finding that about 80 percent of enterprise revenue at OpenAI and Anthropic comes from just 1 percent of businesses. That top tier spends $50,000 to $100,000 per employee, and Anthropic's spend is largely coding-specific. Per-employee monthly spend at the top fell roughly 10 percent, from $8,000 to $7,200, while token volume rose, and open source models remain under 5 percent of business spend. Ramp also found 80 percent of the top 1 percent are VC-backed startups. The discussion is whether the AI trade is underpricing the concentration risk that dependence on venture-funded customers carries, though Garman says most of Anthropic's AWS spend runs through Bedrock across tens to hundreds of…