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Known bias in the practice estimate you get today (measured on the engine that scores free accounts)

Two attempts were made to correct the behaviour below and both were measured, found not to work, and reverted rather than shipped. So this is how the scorer behaves in the product right now, and publishing it is not an admission — it is the point.

The estimate pulls toward the middle of the scale

Weak responses are marked up and strong responses are marked down at the same time, so the spread of estimates is narrower than the spread of real ability. Across all three re-measured runs of the held-out set, every estimate landed between 1.0 and 4.5, and 78% of them between 2.5 and 4.5.

The lower half of the scale is marked high

On the held-out set, responses written to rubric level 2 were estimated about 0.77 of a point high and responses written to level 3 about 0.71 high; levels 1 and 4 about 0.27 high. If you are early in your preparation, the practice estimate is more likely to flatter you than to discourage you — which is the direction that matters most, because it is the one that could send someone into a test they are not ready for.

The top of the scale is marked low, and 5.0 is effectively unreachable

Responses written to rubric level 5 were estimated about 0.56 of a point low, and the prompt as shipped awarded a 5.0 to none of the 40 held-out responses in any of its three runs — including none of its 24 attempts at level 5. A strong writer should read a 4.0 or 4.5 here as compatible with a higher official result, not as a ceiling.

Typical distance from the intended rubric level

Across the held-out set the estimate sat about 0.52 of a rubric point away from the level the response was written to, in either direction — mean absolute error, 0.49, 0.50 and 0.56 across three runs of the prompt as shipped.

What this was measured against

These responses were written to the published ETS descriptors and graded against them by this project, not scored by ETS. So this measures how consistently the scorer applies our reading of the rubric. It is not a measurement of agreement with an official result, and nothing here should be read as one.

Measured August 5, 2026 (UTC). Source: docs/reach120/32-SCORING-MODEL-BENCHMARK.md §12.2 — 40 held-out responses written to the ETS band descriptors, scored three times by the live production prompt as shipped after F-007; raw per-response runs in docs/reach120/benchmark-runs/scoring-accuracy-f007-*.json.