# Nexus 6.10.0 C++ Competitive Claim

## Supported claim

On the locally tested Linux x86-64 host and the checked-in eight-workload comparison corpus, Nexus 6.10.0 demonstrates C++-class release runtime while providing stronger safe-by-default rejection of selected ownership, borrowing, async-Send and capability hazards plus integrated reproducibility, build caching, package/build tooling, C/C++ migration bridges, JSON diagnostics and LSP support.

## Evidence boundary

The evidence is not a proof of universal runtime superiority. The hosted Nexus backend still lowers through C, C++ has a far larger ecosystem, and application-scale/multi-platform external evidence is still required for a broader public claim. Compile-time results must distinguish cold compilation from cached no-change rebuilds.

See `evidence/Nexus-6.10.0-Broad-Cpp-Evidence.json` and the external-certification workflow.