I IMPROVED 15 LLMS AT CODING IN ONE AFTERNOON. ONLY THE HARNESS CHANGED

Summary from the TLDR Dev newsletter

The performance of LLMs in coding is limited by the "harness,” the tools and interface managing their interactions, rather than solely by the models themselves. "Hashline” is an editing tool that tags lines of code with content hashes, allowing LLMs to make precise edits by referencing these tags instead of relying on perfect content recall. Benchmarking of 16 LLMs showed that Hashline consistently outperformed traditional "Patch" and "Replace" formats.