does chatgpt pro plan really offer "unlimited" req...

The short answer

ChatGPT Pro advertises “unlimited” access to the o-series and GPT-4-family models for normal chat messages, but that does not mean you can hammer the service with 100 000 scripted requests in a day.

Plan	o3 usage cap	o4-mini-high	o4-mini	Notes
Free	Not offered	small daily pool	small daily pool	hard-throttled & cooldowns
Plus / Team / Enterprise	100 messages per week help.openai.com	100 / day help.openai.com	300 / day help.openai.com	resets rolling at 00:00 UTC on day 7
Pro ($200 / mo)	Advertised as “unlimited” help.openai.com	unlimited	unlimited	still subject to abuse guard-rails & ToS

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What “unlimited” really means

1. No fixed weekly/daily quota for normal chat messages.
   Unlike Plus, Pro does not cut you off after 100 o3 messages per week; there is no public numeric ceiling. help.openai.com

2. Dynamic rate-limits still exist.
   If the system detects behaviour that looks automated (very high frequency, identical prompts, etc.) you will see a “Slow down / Rate-limit” banner or a temporary lockout.

3. Terms of Use forbid scripted extraction.
   The ToS explicitly bans “automatically or programmatically” extracting data from ChatGPT and forbids attempts to bypass rate limits. openai.com
   Sending 100 000 requests in one day would clearly require automation and would violate that clause, so you would be throttled or suspended long before you reached the target.

4. Feature-specific quotas still apply.
   Deep research queries, for example, are capped even on Pro (250 full-strength runs per month). openai.com
   Similar per-feature limits exist for video/voice, image generation, file uploads, etc.

5. Operational guard-rails.
   OpenAI reserves the right to impose temporary limits “to prevent misuse” and restore access after manual review. help.openai.com

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Practical take-away

• Human-paced usage: If you’re genuinely typing and conversing—even for a long workday—you are very unlikely to hit Pro’s limits.
• Automation / scraping: Anything approaching tens of thousands of calls per day will trip rate-limits and breach the ToS. Use the OpenAI API instead, where high-volume usage is allowed and billed by tokens with clearly documented per-minute limits.
• Other features: Check each tool’s quota inside the ChatGPT interface (hover the model/tool name) so you know when its counter resets.

So, yes—Pro removes the headline message cap, but it is “unlimited within fair-use boundaries,” not an infinite fire-hose for bots.