Loupe / Benchmarks / LMArena WebDev Arena

LMArena WebDev Arena

Human preference between anonymously generated front-end websites.

May republish0 incidents recorded

No fixed ceiling

Scored as a rating rather than a percentage, so there is no maximum to approach and saturation is not well defined for it.

Best reproduced
1628.056011784383Claude Fable 5high effortIndependentwebdev/overall

Observed 2026-07-28 · source

Saturation
Remaining headroom has not been measured. Unknown, not zero.
Contamination controls
  • fresh prompts
  • blind pairwise voting
Licence
CC BY 4.0 Recorded as republishable, so its figures appear on this site.
Update cadence
Continuous, snapshotted
Access path
Hugging Face datasets-server JSON

Incident log

Each entry states what was found, by whom, and when. The kind describes the finding, not anybody’s conduct. An entry without a primary source and a date is not published here.

No incidents recorded in this register.That is a statement about what we have recorded, not a finding that none exist. We have not audited every benchmark, and an absence here is an absence of evidence.