I expected Qwen2.5 7B to retain a noticeable advantage over the smaller Qwen3 4B model for writing correction. In this experiment, it didn't. Across the same 20 paired writing cases, Qwen2.5 7B and Qwen3 4B produced exactly the same complete-case outcome: both succeeded on the same 18 cases and failed on the same 2. The difference became much more noticeable in local execution time: in the tested cold-start setup, Qwen3 4B averaged 23.99 seconds , compared with 54.37 seconds for Qwen...