Any benchmarks of speed and quality of ChatGPT Plus vs Pro subscriptions (same model, same prompts, different subscription)?

Has anyone done a controlled comparison of response speed and quality between ChatGPT Plus and Pro – testing different subscriptions while keeping the model and prompts the same.

I'm interested in measurements of
– Latency
– Response speed
– Accuracy or correctness when reasoning, expert, or coding tasks

If you’ve logged or measured anything or know of relevant studies or benchmarks, please share. I'd love to see any benchmarks or reproducible tests.

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