ChatGPT custom instructions now allow 5,000 characters
mark_k · x · 2026-07-21
OpenAI increased the Custom Instructions limit in ChatGPT from 1,500 to 5,000 characters for Plus, Pro, Enterprise, Business, and Education users.
The change gives users much more room to encode detailed preferences, workflows, formatting rules, and writing style instructions so ChatGPT can follow them more consistently.
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