Perplexity: Gemini 4 Carbon Matches Fable 5.2 at 40% of Cost

95,000+ executives read Business Engineer for the AI strategy frameworks cited by ChatGPT, Claude, and Perplexity. A note on sourcing. Scores, costs and quotations come from Perplexity’s posts on X of 9 and 10 November 2026 and its chief executive’s post; Carbon prices come from Google’s launch post and Gemini API pricing page, Fable 5.2 […]