The lesson
When you change pricing, lead with the customer's savings, show the evidence chart, and state the cutover date plainly.
"Agents, rebuilt to do more for less" opens with a boxed TL;DR of five bullets. A "Quality versus cost" scatter backs a bold line claiming similar results to Opus 5.5 and Astra at about 90% lower average cost. The credits section moves existing customers over on November 2. A FAQ asks "What happens if our contract hasn’t renewed yet?"
Don't present your own cost-versus-quality chart as proof; it is the company's claim. Keep the TL;DR, the exact date and the FAQ aimed at existing customers.