Living Worlds

Research · Lifetimes · Oct 11, 2026

Siblings on both sides, in three years never read

Met18 cells, 2002, 2006 and 2014

The test at a glance

What it tests
Accuracy against reality: reported brothers and sisters, on both sides.
Data
General Social Survey, US-born respondents, 18 cells in 2002, 2006 and 2014; the engine lives from 1900.
Held out
The sibling answers of those three years.
Compared against
Gemini 3.8 Flash answering from what it has read, and the earlier engine.
Bar
Lower mean error over the 18 cells than both.
Result
0.31 against 0.45 and 0.55: met.

Counting brothers and sisters on both the mother's and the father's side, Living Worlds came within 0.31 on average across Americans aged 25 to 59, against 0.45 for a frontier model answering from what it has read and 0.55 for the earlier engine, and was closer than the model in 2002 and 2006. It was built without a single sibling answer; on a check it never saw, 14% of its fathers have children with more than one woman in 2014, against 14.6% in the Census survey that year. Registered before any sibling answer from 2002, 2006 or 2014 was read; scored on 18 cells of the General Social Survey.

Protocol, result and scorer

Protocol Engine answers, 2002 Engine answers, 2006 Engine answers, 2014 Earlier engine, 2002 Earlier engine, 2006 Earlier engine, 2014 Text-model answers Scorer Result

Next

Step and half brothers and sisters, as people born after 1975 report them, on survey years not yet read.

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