Every time I use Composer 2.5 I have to spend a bunch of time cleaning up its mistakes. It is unusable compared to GPT 5.4 or 5.5.

My time is more valuable that I will use a model that doesn’t f** up my code base.

Keep composer away from anything configuration related—it will ruin your day.

give it a structured plan and it it does really well compared to similar priced models. I'd never use it for anything that required heavy reasoning and it's not built for that.

Isn't Composer 2.5 designed to be used from the Cursor harness, and is otherwise not that useful?

I use it from the Cursor harness.

Weird I use it 8 or so hours a day and I haven’t had that issue

I think we need to be explicit about the domains we're applying Composer 2.5 to in these discussions.

I mentioned here (https://news.ycombinator.com/item?id=48766275) how poorly it handles my specific use cases. My coworkers in DevOps and frontend UI swear by its cost-effectiveness, whereas I strongly prefer the reasoning capabilities of Opus 4.8 and Fable 5.

Composer 2.5 seems to be SOTA for Helm charts and React/Vue, but, for my usecases it absolutely struggles spectacularly when tasked with rigid body dynamics or kinematic logic.