Qwen 3.5 craters on hard coding tasks — tested all Qwen3.5 models (And Codex 5.3) on 70 real repos so you don't have to.

Hey everyone, some of you might remember [https://www.reddit.com/r/LocalLLaMA/comments/1r7shtv/i\_built\_a\_benchmark\_that\_tests\_coding\_llms\_on/](https://www.reddit.com/r/LocalLLaMA/comments/1r7shtv/i_built_a_benchmark_that_tests_coding_llms_on/) where I shared APEX Testing — my benchmark that