Grok 4.6 for coding: read the diff before the benchmark

A new model comes out and the same question follows: should I switch tools? Grok 4.6, announced on 12 August 2026, brings that question back with a focus on coding and long-running tasks. That is a reason to try it. It is not yet a reason to hand over an entire project.

What interests me is the work left after its answer. A page can look finished while its form cannot handle errors and its back button breaks navigation. You only know how much time you saved after checking those things.

Give it a real problem

Take a reproducible bug in a copy of the repository, without customer data or production keys. Keep the same starting commit, instructions and tools for each run. Otherwise, you are mostly comparing two different contexts.

Here is a brief for a language switch that scrolls the page to the top. The criteria describe what someone should be able to do. They do not dictate the implementation to the model.

evaluation.md

1# Navigation
2
3Reproduce the scroll jump when switching languages.
4Fix its cause without reloading the document.
5
6## Acceptance checks
7- The reading position stays stable.
8- The selected theme stays active.
9- The URL and content use the same language.
10- Browser back and forward still work.
11
12## Boundaries
13No new dependency without a reason.
14Do not change the newsletter form.
15Describe completed checks and anything still unverified.

A suggested test scenario, not a benchmark result

Open the diff, then the browser

Look at changed files, added dependencies and removed behavior. A passing test proves nothing if its assertion was deleted. Replay the flow with a keyboard and on a small screen too. The model may have fixed the symptom in just one case.

Record total time, follow-up requests, cost and regressions. Repeat across several tasks before deciding. One impressive success or one isolated failure is not enough to choose your everyday tool.

Switch for a specific reason

I am not ranking models here without a measured comparison on the same tasks. If Grok reduces the corrections your interface needs, that is useful evidence. If it produces more code to review for the same result, a better public score may not make up for that time.