This is a submission for the Gemma 4 Challenge: Write About Gemma 4

Introduction

Cloud coding assistants are useful. I use them to explain unfamiliar code, generate tests, review changes, and sometimes help me debug weird problems faster than I could alone. But I have always had one question: What if I can use coding assistants locally? Is it possible?

That question led me to try a setup with latest open weight model of Google which is Gemma 4. This is my setup:

Gemma 4 26B A4B MXFP4 of Unsloth as the model

OpenCode as the coding agent

My own codebase as the test environment

The goal was simple: I wanted to see whether Gemma 4 could behave like a useful local coding agent inside my real development workflow. Not a benchmark. Not a perfect lab test. Just a practical experiment: give the model real coding tasks, let it inspect files, ask it to make changes, and see what actually happens.

What is OpenCode?

OpenCode is an open-source AI coding agent.…