Adjust character limits for ChatGPT custom instructions
Understand the character limits for custom instructions based on your ChatGPT plan.
Free and Go users can save up to 1,500 characters. Plus, Pro, Enterprise, Business, and Education users can save up to 5,000 characters.
Where
Settings > Personalization > Custom Instructions
Why
Different user tiers have varying capacities for custom instruction text, impacting the detail you can provide.
What it does and when to use it
Be aware of the character limits for ChatGPT's Custom Instructions. Free and Go users have 1,500 characters, while paid tiers offer 5,000 characters, influencing how much detail you can provide for personalization.
Sources and credit
- ChatGPT Custom Instructions ↗OpenAI · OpenAI Help Center · Sep 6, 2026 · paraphrased
First seen on Subvolts Sep 6, 2026. Updated Sep 11, 2026. Spotted a problem? Tell us.
Where it shows up
- ChatGPT Custom InstructionsOpenAI · OpenAI Help Center · Sep 6, 2026
Terms used
Related in the PlaybookPlaybook →
The Playbook: reusable how-tos, prompts, configs and tips pulled out of the news.
- Setting tipConfigure ChatGPT custom instructions for personalized responsesSet up custom instructions in ChatGPT to tailor its responses to your specific needs and preferences. · 5 min
- Setting tipDelete custom instructions from ChatGPTRemove your custom instructions from ChatGPT via the settings menu. · 1 min
- Troubleshooting fixApply custom instruction updates to all current and future chatsUpdates to custom instructions are applied immediately to all current and future conversations. · 1 min
- Setting tipCustomize ChatGPT behavior with Custom InstructionsSet stable preferences for ChatGPT's role, tone, and formats to avoid repetition. · 5 min
- Troubleshooting fixRemove custom instructions from past ChatGPT conversationsClear chat history to remove custom instructions from previous conversations. · 5 min
- Setting tipUse custom instructions for persistent preferencesSet default personality and preferences in Settings > Personalization for consistent AI behavior. · 5 min
Questions people ask
- Which AI tools does this work with?
- The sources used it with ChatGPT.
- Where did this come from?
- OpenAI (OpenAI Help Center). Subvolts collected, normalized and credited it; the link above opens the original.