Recognises a definition failing the substitution test
Replacing the term with its definition in a normal sentence changes or breaks the meaning.
Can AI do this?
AI does this well Most of the tested AI models master this. 10 of 10 models master it.
| Model | Tier | Probability of mastery | Status |
|---|---|---|---|
| gemini-4-argon | Flagship | 100% | Mastered |
| gemini-3.1-pro-preview | Flagship | 100% | Mastered |
| gpt-6-astra | Flagship | 100% | Mastered |
| claude-fable-5-1 | Flagship | 100% | Mastered |
| gemini-3.8-flash | Mid tier | 100% | Mastered |
| gpt-6.1-sol | Mid tier | 100% | Mastered |
| claude-sonnet-5-5 | Mid tier | 100% | Mastered |
| gemini-3.5-flash-lite | Low cost | 100% | Mastered |
| gpt-6-luna | Low cost | 100% | Mastered |
| claude-haiku-5-5 | Low cost | 100% | Mastered |
Mastered means a probability of at least 90% that the model has this knobit, estimated from its graded answers. “Not shown” means the answers do not settle it either way. How the models are tested.
What it looks like in practice
Expected result: The sentence where substitution breaks and why
How it is assessed: Flags the deficient case and passes the acceptable one. Deficient: arrears rate: loans that are overdue. "The arrears rate rose to 3 %" becomes "The loans that are overdue rose to 3 %" Acceptable: arrears rate: proportion of loans whose arrears day count is above zero at the end of a given period. "The proportion of loans whose ... rose to 3 %" still reads correctly
Also known as: Fails substitution (business term)
Related knobits
Builds on
All 20 knobits of Define business terms.
Source: Review checklist 02-business-terms, row 12