Not even close. "enterprise" companies are negotiating contracts. Call it pre-provisioned capacity, wholesale pricing, etc. Same is true for AWS, Azure, Salesforce, or literally any SaaS provider ever. There is a reason literally every single pricing page for any SaaS provider has an "Enterprise? call us" column.
From what I've heard those enterprise negotiated discounts for Anthropic tend to be in the 15-30% range, which isn't anywhere near the deal you could get from using the $100/ or $200/ or $500/month subscriptions.