OpenAI has raised the maximum length of Custom Instructions from 1,500 to 5,000 characters, as announced via OpenAI on Bluesky. The feature allows users to configure ChatGPT with persistent instructions—such as preferred writing style, output format, or subject matter expertise.
At a glance
- Custom Instructions: 1,500 → 5,000 characters
- Source: OpenAI (Bluesky)
- Users can now set "hauntingly specific" instructions
What it means
The increased space allows for more precise context and requirement definitions—useful for agencies using ChatGPT in client workflows or enterprises calibrating the model to internal standards. Users who previously had to compress their instructions now have significantly more room. This is a straightforward feature update with no breaking changes—existing Custom Instructions remain valid.
Sources
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