Qwen2.5 7B vs Qwen3 4B & 8B for Writing Correction: 60 Local Ollama Responses on Windows
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…
The source material outlines an experiment comparing the writing correction abilities of three Qwen models: Qwen2.5 7B, Qwen3 4B, and Qwen3 8B. The key findings are:
1. In a benchmark of 20 paired writing cases, Qwen2.5 7B and Qwen3 4B achieved identical complete case outcomes, succeeding on the same 18 cases and failing on the same 2 cases. Qwen3 8B achieved 95% success.
2. For the primary metric - complete correction of expected errors - Qwen3 4B and Qwen2.5 7B both achieved 90% success, while Qwen3 8B achieved 95%.
3. The local cold-start execution times showed a notable difference. Qwen3 4B required only 23.99 seconds, compared to 54.37 seconds for Qwen2.5 7B and 60.24 seconds for Qwen3 8B. This makes Qwen3 4B approximately 2.27 times faster than Qwen2.5 7B in the tested configuration.
4. In terms of error localization, Qwen3 4B localized 20/21 expected error regions (97.6% F1), while Qwen2.5 7B also localized all 21 regions (97.6%). Qwen3 8B achieved perfect localization at 100%.
5. For expected-correction coverage, Qwen2.5 7B and Qwen3 4B matched at 90.5%, while Qwen3 8B achieved 95.2%.
6. The explanation checks showed that Qwen2.5 7B and Qwen3 4B both had 100% compliance in explanation-language and consistency, while Qwen3 8B had 100% compliance as well.
The source concludes that while Qwen3 8B achieved the best overall performance, Qwen3 4B preserved the same complete-case outcome as Qwen2.5 7B across all 20 cases and responded much faster. The experiment does not identify a universal "best model," but demonstrates that a smaller, newer generation model (Qwen3 4B) can match the primary correction performance of a larger previous generation model (Qwen2.5 7B) while being substantially faster.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
