Fable 5 Writes CUDA Kernels to Boost Qwen-3 Decoding by 30%+
adonis_singh · x · 2026-07-03
A user had Fable 5 (Claude Fable 5) directly write CUDA kernels tailored for Qwen-3. Tested on an RTX 5090, decoding speed increased by over 30%, and the file size was smaller than the llama.cpp baseline at the same quantization precision.
This is a practical case of a frontier AI model taking on real underlying inference optimization tasks, showcasing the value of AI coding assistants in high-performance computing scenarios rather than just serving as conceptual demos.
For individual developers, this case proves that AI coding assistants can participate in inference stack optimization, yielding measurable performance gains without requiring a deep background in CUDA.
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