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Model components / Benchmark / eval datasets

Anthropic Internal Coding Evals

Anthropic (Internal)

Coding evaluation sets Anthropic uses internally to benchmark Claude during development, covering agentic coding tasks, multi-file editing and tool use. They are referenced in model cards and responsible-scaling documents, and the take-home exam Anthropic sets for performance-engineering candidates is used as one of them.

Distinct from the public benchmarks Anthropic also reports, such as SWE-bench Verified and Aider Polyglot. Verified 2026-08-13 via Anthropic's Claude Opus 4.5 announcement.

Openness

0 high confidence
0.0
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

Adoption

not assessed

Internal-only eval sets used solely by Anthropic: no external users, no downloads, and no third-party citation as a runnable standard. There is no honest external adoption signal to record, so the level is left deliberately unscored rather than guessed at.

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

    the coding evaluations are described as internal benchmarks used to assess Claude, with no released artifact and no usage figure, so there is nothing external to band

Capability

not assessed

Capability is not a meaningful axis for an eval dataset, so it is left unscored. The announcement reports the model's scores rather than any capability of the eval sets themselves.

Verified 2026-08-13