Does length raise your Academic Discussion score? 3,692 answers measured

Official TOEFL materials say an effective Academic Discussion response contains at least 100 words. Almost every sample answer clears that bar: 49 of 3,692 (1.3%) fall short of it, and the median answer is 154 words. The question that matters is what happens above 100.

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<figure style="margin:0;max-width:880px">
  <img src="https://lingoleap.ai/research/charts/academic-discussion-length.svg" alt="Mean score by answer length" width="880" height="540" style="max-width:100%;height:auto" loading="lazy">
  <figcaption>Source: <a href="https://lingoleap.ai/research/academic-discussion-length">LingoLeap, Does Length Raise TOEFL Academic Discussion Scores? Data</a></figcaption>
</figure>

/research/charts/academic-discussion-length.svg

Sample

Every non-legacy TOEFL Academic Discussion task in LingoLeap's sample library, and the first 20 published sample answers for each: 3,729 sample pages. After exclusions, 3,692 answers across 1,467 tasks (mean score 25.17, SD 2.42; median length 154 words). These are real learner answers that LingoLeap publishes as samples, not every answer ever submitted.

Period

Retrieved 26 Sep 2026. The endpoint does not expose when an answer was written, so submission dates are not recorded.

Source

LingoLeap's public sample endpoint (the same data the sample pages show), read at no more than two requests a second: 3,723 of 3,729 pages returned a record.

How scores were produced

LingoLeap's AI estimate on the 0-30 scale and three rubric sub-scores on 0-5 (Relevance and Contribution to Discussion; Clarity and Elaboration of Viewpoint; Language Use and Grammar), parsed from the grader's report. Not ETS scores, and not on the 1-6 band scale ETS reports for tests from 21 January 2026.

Exclusions

13 records with no answer text and 8 grader failures (overall 0 with every sub-score 0). Any group smaller than 30 answers is not reported.

Limitations

Observational: longer writers may also be stronger writers, so length is not a lever. Published samples average 25.2 of 30, so weaker and shorter answers are under-represented. LingoLeap AI scores, not ETS.

Privacy

Only aggregates are published. No answer text, names, or individual scores appear on this page or in the download.

Length

Words are counted as runs of letters and apostrophes in the answer text, the same tokeniser as LingoLeap's template study. Numbers and punctuation do not count.

1. 1

   Not ETS

   The scores come from LingoLeap's AI grader. Nothing here tests how ETS scores length.

2. 2

   Not every learner

   The answers are LingoLeap's published samples, which average 25.2 of 30. Weaker and shorter answers are under-represented, so the under-100 share is likely lower here than among all test-takers.

3. 3

   Not causal

   Padding an answer is not the same as writing a longer answer with more to say. This data cannot tell the two apart.

4. 4

   No submission dates

   The public sample data does not say when each answer was written, so the study has a retrieval date, not a date range.