OpenAI has significantly enhanced the user experience for its paid customers by increasing the character limit for custom instructions in ChatGPT from 1,500 to 5,000 characters as of July 15, 2026. This major upgrade allows users to have more detailed and nuanced preferences encoded into the AI's behavior, enabling more tailored and consistent interactions across sessions.

Details of the Upgrade

The increase from 1,500 to 5,000 characters means users can now include complex requests and specifics that were previously constrained by the shorter limit. This change is especially beneficial for those using custom instructions to shape the conversation flow based on professional backgrounds or communication styles.

Initially launched in 2023, the custom instructions feature allowed users to input preferences like “always respond concisely” or “consider my background in software engineering.” However, the limited character count forced users to prioritize their requests, often compromising clarity for brevity. The update expands this framework, enabling richer user customization.

Impact on Users and Model Transition

This character limit increase applies only to subscribers on Pro, Enterprise, Business, and Education plans. Free users do not benefit from this enhancement at this time, and no timeline has been provided for extending this feature to them. The timing coincides with the broader transition within OpenAI’s models, moving from GPT-4.5 to GPT-5.5, and reports suggest improved compliance with user instructions in the current flagship model, GPT-5.1.

The guidelines published for GPT-5.6 also offer more nuanced prompting frameworks, assisting users in maximizing the extended character limit.

While this update has no direct implications for the crypto space, it reflects OpenAI's commitment to enhancing its product functionality and addressing user needs. The enhancements to custom instructions provide a greater level of expressiveness, following earlier updates that universally applied such customization across conversations.

This article is for informational purposes only and does not constitute financial advice.