Context rot

In plain language

A longer prompt can make useful information harder for the model to use.

In a sentence

• The team tested context rot by placing the same answer in prompts of different lengths.
• Context rot appeared before the model reached its advertised input limit.

Examples written for this glossary

Usage note

The cited report measures uneven use of long inputs across tested models and tasks. It does not imply that every extra token causes a predictable decline.

See also

• Long-horizon task

  Piece of work requiring a sustained sequence of dependent actions over a period long enough that finishing it tests an agent's ability to maintain progress.