It ain’t the best for sure, but if you have trouble letting it move 20 lines I don’t know what’s the cause but that’s not my experience at all. I do make pretty extensive use of guardrails and proper instructions in my AGENTS.md.

I also value super boring code bases with an as much as possible uniform shape. I guess that’s also helping out.

Depends on what you look at. Gemma 4 31B without reasoning benchmarks significantly higher than GPT-5.4 without reasoning on artificial analysis. Even the new Gemma 4 12B beats it. And while GPT-5.4 with xhigh reasoning beats the reasoning version of Gemma 4 31B, the question is why you would throw such a complicated task that needs so much reasoning at such a small model to begin with. So if you do coding, you'll probably not have much success with either model. But for actual simple tasks that these models were made for, they are extremely capable. E.g. hook it up to the Atlassian MCP and have it do all the stuff that is supplemental to coding in big enterprises.