How I Discovered a ChatGPT Rate Limit Workaround.


Affected Feature

ChatGPT's message cap enforcement for GPT-4o users. OpenAI limits how many messages you can send with GPT-4o in a session to manage costs and resources.

How to Reproduce

  1. Use GPT-4o until you hit the message limit
  2. Instead of starting a new chat, click "Share Chat" and copy the link
  3. Paste the link back into ChatGPT and send it
  4. Click the link and select "Continue this conversation"
  5. Send another message - it goes through even though you hit the cap
  6. Repeat to keep sending messages beyond the limit

The model switches to GPT-3.5 for the extra messages, but you keep the full conversation context and bypass the intended limit.

Company Response

Reported to OpenAI via Bugcrowd. They confirmed the issue but marked it as a duplicate since another researcher had already reported it. No bounty, but they acknowledged the finding.

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