Quick Answer
Free users get limited GPT-4o access. Plus gets ~80 GPT-5 messages per 3 hours. Pro is unlimited.
Detailed Answer
ChatGPT Free provides limited GPT-4o messages with fallback to GPT-4o mini when limits are hit. ChatGPT Plus at $20/month offers around 80 GPT-5 messages per 3 hours plus unlimited GPT-4o. ChatGPT Pro at $200/month gives unlimited access to all models. Limits reset on a rolling window, and exact numbers fluctuate based on demand.
Find Your Own Answer
The best way to decide is to try them yourself. Council lets you compare multiple AI responses to the same question.