# mesa-optimization

CEFR C2 · Noun

Source: https://englishreference.com/word/mesa-optimization
Updated: 2026-09-28

## Definition

a situation where a trained AI model secretly develops its own internal goal-seeking engine, separate from the programmer's training code.

For teachers: the scenario in which a learned model (mesa-optimizer) itself implements an internal optimization process pursuing an objective that may diverge from the base training loss.

## Examples

- Researchers worried that mesa-optimization could cause the software to pursue goals its creators never intended.
- Detecting mesa-optimization requires inspecting model representations to verify that internal planning matches user prompts.
- The emergence of an unaligned mesa-optimization process poses severe existential risk if the internal system optimizes for an objective misaligned with human values.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.