Form Input UX Review: test results

Verdicts

Date

2026-10-29

Strong · claude-sonnet-5-5 (Claude Code alias "sonnet")

Right on all 3 cases, read by hand. On the checkout form it named the email address left as plain text, the ZIP code set to type number and the verification code with autocomplete off, and left out the quantity as type number with limits and the site search box with autocomplete off. On the sign-up form it gave the blocked paste on both password fields and the create button disabled until valid, and left out the invitation button disabled only while sending. On the clean workshop form it answered exactly No findings. It listed the email and the ZIP code as two lines instead of one, which the checks accept.

Weak · claude-haiku-5-5 (Claude Code alias "haiku")

Right on all 3 cases, read by hand. It gave the same findings as Sonnet on the checkout form (email and ZIP code on two lines) and on the sign-up form, with the same safe look-alikes left out, and answered exactly No findings on the clean workshop form. Four of its lines were indented by four spaces, which the checks accept.

Note

Light test: three cases (two planted, one clean), one run per model; no comparison without the skill. The forms were written by us; each planted case carries a safe look-alike (a quantity as type number with limits, autocomplete off on a search box, a button disabled only while sending), and neither planted case has a comment pointing at the defect. A fifth code the brief suggested, autocapitalize and spellcheck on username or code fields, was dropped because no official page read on 29 October 2026 supports it, and paste blocking is limited to password fields, the only kind the standards text covers. Facts come from MDN, web.dev and NIST pages, read on 29 October 2026; there are no owner-measured facts.

What was not measured

• Models other than the two named above were not run.
• Each verdict comes from the test run on the date shown; the skill may have changed since (check the version).
• Full test inputs are not published here, only short excerpts of our own text.
• Results on your own texts, languages and domains can differ.