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 2026-06-04

  references to internal coding benchmarks and an internal performance-engineering take-home exam, described as proprietary/internal, alongside (separately) public benchmarks