Free lunch here relates to pricing/speed I would say, because gpt-4 and gpt-4-turbo are sold together. If gpt-4-turbo is cheaper, faster and has much larger con

Free lunch here relates to pricing/speed I would say, because gpt-4 and gpt-4-turbo are sold together. If gpt-4-turbo is cheaper, faster and has much larger context window, why would it make sense to also sell gpt-4... Unless it's a marketing trick or perhaps for backwards compatibility, which could also be.