On November 30, Sonnet 4.5 is retired and the Carbon promotion also ends: handle the 2 things separately
Author’s note: Two things happen on November 30. Anthropic retires Sonnet 4.5, and Google’s introductory pricing for Gemini 4 Carbon ends. They come from different vendors and are handled differently, so this article covers them separately. All platform prices use the 2026-11-11 price list. On November 30, you may get two reminders at once: Sonnet … Read more