Exponential in how useful LLM APIs and LLM based products like Google AI Lab, ChatGPT, etc. are to me personally. I am the data point I care about. I have a pet programming problem that every few months I try to solve with the current tools of the day. I admit this is anecdotal, just my personal experiences.
Metrics like training data set size are less interesting now given the utility of smaller synthetic data sets.
Once AI tech is more diffused to factory automation, robotics, educational systems, scientific discovery tools, etc., then we could measure efficiency gains.
My personal metric for the next 5 to 10 years: the US national debt and interest payments are perhaps increasing exponentially and since nothing will change politically to change this, exponential AI capability growth will either juice-up productivity enough to save us economically, or it won’t.
I think you're using words like "exponential" and "exponentially" as intensifiers and not in the mathematical sense, right? People are engaging in discussions with you expecting numbers to back your claims because of that.
Because exponentially growing costs with linear or not measurable improvements is not a great trajectory.