OpenAI has bumped the custom instructions limit for ChatGPT to 5,000 characters, giving paying users more room to fine-tune the chatbot's behavior. The change applies to ChatGPT Plus, Team, and Enterprise subscribers, who can now write longer, more detailed instructions about how they want the AI to respond.
What the new limit means
Custom instructions let users set persistent preferences—like tone, format, or background context—so they don't have to repeat themselves every session. Before the update, the limit was lower, though OpenAI didn't specify the exact previous cap. The new 5,000-character ceiling roughly doubles the available space, according to reports from users who noticed the change in their settings.
The feature works by letting you write two sets of instructions: one for what you want ChatGPT to know about you, and another for how you want it to respond. Both fields now accept up to 5,000 characters each, meaning a total of 10,000 characters of guidance per account.
For people who use ChatGPT for complex, repetitive tasks—like drafting legal documents, writing code, or generating marketing copy—the extra space means they can include more examples, specify more constraints, and define more nuanced rules. That could reduce the number of follow-up corrections and make the AI's output more consistent.
Productivity gains are the obvious upside. A developer who needs code in a specific style can now paste in a full style guide. A writer who wants a consistent voice can include several sample paragraphs. The change is especially useful for teams that share accounts or want to enforce brand guidelines without re-entering them each time.
But there's a potential downside: longer instructions might slow down response times slightly, since the model has to process more text before generating an answer. OpenAI hasn't commented on any performance impact.
How to use custom instructions
To set or update your custom instructions, open ChatGPT, click on your profile name, select “Customize ChatGPT,” and fill in the two text boxes. The first box is for what you want the AI to know about you—your role, your goals, your preferences. The second is for how you want it to respond—tone, length, format, any rules it should follow.
The feature is available on the web and mobile apps for Plus, Team, and Enterprise users. Free-tier users don't have access to custom instructions at all.
With the new limit, users can now paste in entire documents or detailed briefs. Some early adopters have already started testing the boundaries, feeding in multi-paragraph instructions that cover everything from writing style to ethical boundaries.
Whether the extra capacity leads to better results depends on how carefully users craft their instructions. Vague or contradictory prompts will still produce mediocre outputs, even with more room to write.
