Decoder. plain-English AI glossary

Capability evaluation

● Core

Testing whether a model can perform a specific skill (math, code, reasoning) at all, regardless of perfect execution.

Think of it like

A driver's test where you just check whether someone can parallel park, not how perfectly.

Example

Does the model know how to do chain-of-thought reasoning on math problems? You ask a few hard math questions and see if it attempts reasoning steps.

How it actually works

Capability eval answers "can this model do the thing?" Benchmark eval answers "how well?" Capabilities emerge unpredictably as models scale, so capability eval is how researchers discover new abilities. The catch: a model might have the capability but fail due to prompting, temperature settings, or just bad luck on the sample.

For product teams

Tells you what to expect from a model before detailed benchmarking.

For engineers

Write tests for each capability. Use simple examples first. Track emergence curves as models scale.

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