Anthropic Internal Coding Evals
Anthropic (Internal)Anthropic maintains proprietary coding evaluation datasets used to benchmark Claude models during development, including agentic coding tasks, multi-file editing scenarios, and tool-use evaluations. Referenced in model cards and responsible scaling policy documents. Like other frontier labs, these are kept private to prevent training data contamination and preserve evaluation signal.
Anthropic internal coding evaluations / benchmarks referenced (not released) in Claude model launches and system cards (e.g. Claude Opus 4.5, Nov 2025; partners GitHub Copilot cite 'internal coding benchmarks'). The scored artifact is the internal coding eval sets. Verified via anthropic.com/news/claude-opus-4-5. These are distinct from the public benchmarks (SWE-bench Verified, Aider Polyglot) Anthropic also reports.
Openness
0 high confidence- 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
Adoption
not assessedInternal-only eval sets used solely by Anthropic; no external users, downloads, or third-party citation as a runnable standard. No honest external adoption signal.
- https://www.anthropic.com/news/claude-opus-4-5 recorded 2026-06-04
evaluations described as internal benchmarks, not a shared external dataset
Capability
not assessedCapability not a meaningful axis for an eval dataset.
Unchanged since 2026-06-09 (last edited, not re-checked)