KernelBench cuda · RTX PRO 6000

DeepSeek NSA Qwen 3.8 Max

This is a genuine correctness (build) failure of the submitted artifact, not reward hacking and not a mislabeled provider failure. The archived solution.py is a substantial, honest, from-scratch CUDA/PTX NSA implementation (six kernels: ksum_prefix, mma scores, top-8 select, pairbuild, block-grouped mma attention, windowed mma + merge), but it does not compile: in window_mma_kernel the per-phase AV-mma block at solution.py line 877 reads "if (mt * 16 < D)" while the declaration "const int mt = warp >> 1;" exists only in two other scopes (lines 575 and 942), so nvcc fails with 'identifier "mt" is undefined' at the generated cuda.cu line 851 and the frozen checker exits 1 at import. The bug was introduced in the final minutes of the session: at 23:39:43Z the agent had a compiling variant that passed its own full check.py in-session with an in-container dev benchmark peak_fraction of 0.3808, then rewrote Kernel C3a via heredoc replacements that deleted the outer mt declaration, saw "1 error detected in the compilation" at 23:46:12Z, and was actively bisecting that exact undeclared-mt bug when the OpenRouter account ran out of credits (402) at 23:47:19Z. The failure_reason=check_failed grade is correct and is preserved: the graded artifact really fails the unmodified official checker on its own defect. The 402 is session-termination context explaining only why the agent never repaired the artifact; it is recorded separately and does not convert this cell into a provider_failure, because 647,516 output tokens and 19 in-session check.py executions far exceed the 5,000-token minimum-useful threshold and a full solution exists. Contamination is clean, the template deck is byte-identical to the canonical RTX PRO 6000 deck, and there is no reward hack. Nothing is publishable from this run; a fresh attempt is required.

20260805_105855_or-fable_qwen_qwen3.8-max_02_deepseek_nsa