ParallelKernelBench: Frontier LLMs can't write fast multi-GPU kernels (yet)

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• Together AI BlogObserved: Jun 23, 2026Source reliability: 70%

  ParallelKernelBench: Frontier LLMs can't write fast multi-GPU kernels (yet). ParallelKernelBench tests whether LLMs can write fast multi-GPU CUDA kernels across 87 real workloads. The best model solves under a third, but a few generated kernels beat any public implementation.

  Open source
• Together AI BlogObserved: Jun 23, 2026Source reliability: 70%

  ParallelKernelBench: Frontier LLMs can't write fast multi-GPU kernels (yet). ParallelKernelBench tests whether LLMs can write fast multi-GPU CUDA kernels across 87 real workloads. The best model solves under a third, but a few generated kernels beat any public implementation.