AI detectors ranked by minimum text length per check

Field sorted: the minimum input field on each card, written on 9 November 2026 from the input limits text that was read on 8 November 2026 for the first sixteen cards and 9 November 2026 for the twenty-six added that day. A figure qualifies when the vendor states it as a requirement ("minimum", "at least", "must", "requires", or a result returned only above the figure); a figure the vendor calls recommended, guidance or a tip does not qualify and sits in the second table. Where a vendor states two floors, the smaller one is sorted and both are printed. Word figures are converted to characters at 5.5 characters a word for ordering only, so a 30-word floor sorts as 165 characters, and the vendor's unit is printed beside it. Direction: smaller ranks higher, because the page answers which detector will check the shortest text. Tie rule: more study records first, then product name, so Originality.ai (7 records) sits above Surfer (0) at 550 characters and Turnitin (5) above Turnitin Clarity (0) at 1,650. 12 of 72 qualify; 9 state a recommendation or a code guard; 51 state no minimum. Full rules: methodology page. No record in the studies index measures a detector's behaviour at its minimum length; the OpenAI classifier record notes that OpenAI called its 2023 classifier "very unreliable" below 1,000 characters, the only vendor statement of reliability by length in the index (OpenAI classifier 2023).

Vendors state floors in different units on different pages, and some state two. Copyleaks states 255 characters for the web platform and 350 for the browser extension on one page (copyleaks.com, read 8 November 2026). Phrasly states 30 words on the detector page and 50 words in the Business API documentation (phrasly.ai, business.phrasly.ai, read 8 November 2026). Sapling states "about 50 words" on the web page and "at least 300 characters recommended" in the API documentation, both as recommendations (sapling.ai, sapling.ai/docs, read 8 November 2026). The 5.5 characters a word conversion is the rate every page of the index uses since 9 November 2026; the input limits ranking converted at 6 characters a word until that date and now prints the same rate, so the two pages give one character figure for the same word count. All read 8 and 9 November 2026; the Updated line is the date the page last changed.

The newsrooms view, added 9 November 2026, filters these floors by a second field, an API or browser extension, and finds 5 cards under 500 characters that state both.