Beyond the benchmarks: Understanding the coding personalities of different LLMs

A Sonar report examines the "coding personalities" of five LLMs using static analysis on Java assignments. Models like Claude Sonnet 4 (verbose "senior architect") and OpenCoder-8B (concise "rapid prototyper") showed distinct traits but shared weaknesses, including high-severity vulnerabilities. Newer models with better benchmark scores often produced riskier code. Research on GPT-5's reasoning modes revealed that higher reasoning doesn't always improve performance and may introduce harder-to-detect flaws, emphasizing tradeoffs beyond benchmark scores.