TL;DR: If you want to use ChatGPT heavily, the most frustrating option might actually be the seemingly more advanced Business plan. Reddit's r/codex and r/OpenAI have been arguing nonstop this past month, and the conclusion is pretty counterintuitive—at the same $20/month tier, Business advertises 'almost unlimited,' but OpenAI enforces fair use much more strictly on it. In real-world tests, Plus users running Codex can go for 1-2 hours straight, while Business users often hit limits after just 10-30 minutes. Some people upgraded and burned through their '5-hour quota' in just two messages, leaving them so frustrated they wanted to cancel. What’s even crazier is the weekly limit for Thinking tasks: Plus, Business, and Pro all have the exact same cap of 3,000 messages per week. In other words, the extra money you’re paying for Business is for team features (workspaces, SSO, no data used for training), not for higher usage limits. Someone even crunched the numbers: the total usage for two Business seats is still less than what you’d get by switching between two Plus accounts on your own. So if you really want to run Codex heavily or do long-chain thinking, either stick with Plus or go all-in on Pro ($100 for 5x usage, $200 for 20x). The Business plan in the middle is meant for team collaboration, not for individuals looking to max out compute power. That said, these limits change super quickly, and the whole system feels like a guessing game. Before impulsively upgrading, check your actual weekly usage in the settings first.