ChatGPT — July 15, 2026

This update delivers a major enhancement to custom instructions, significantly increasing the character limit. Plus, Pro, Enterprise, Business, and Education users now benefit from an expanded capacity to save up to 5,000 characters, a substantial rise from the previous 1,500. This expansion provides much greater flexibility for users to fine-tune ChatGPT’s response style and behavior, enabling more personalized and precise interactions.

Source: official ChatGPT & Codex release notes. Summaries are written from the official notes; see how we work.