Anthropic (Internal)

data

closed(internal coding eval/take-home exam sets, never published)

datasheet

no

license

none

access

internal-only(referenced in announcements/system cards, not distributed)

Internal proprietary coding eval sets; only narrative results are mentioned, the data is not redistributable.

• https://www.anthropic.com/news/claude-opus-4-5 recorded 2026-08-13

  "We give prospective performance engineering candidates a notoriously difficult take-home exam. We also test new models on this exam as an internal benchmark."; partner quotes reference surpassing "internal coding benchmarks". Neither the exam nor the benchmarks are published, and no license or datasheet appears anywhere on the page