Yeah, Glimmer is excellent. You don't really test Glimmer with one-shots, because it's explicitly designed for multi-turn solution finding. The way I see it, if I've got a task that could be done either agentic or requires a lot of context (for example, dumping 600KB of API documentation and another 300KB of codebase for a project) then I would reach for Glimmer easy and it seems like it could get there most of the time.
Qwen might be useful to bring out for a second opinion on some more focused details that are largely information complete. Like, use Glimmer to bring together all the relevant critical data and evaluate what the actual problems are, then maybe prototype a solution. If it's still acting up, maybe throw the resulting context at Qwen and let it meditate on it.
I think there was some study done where ideally you would want to throw a bunch of different models at a problem since they don't all have the same perspective or diagnosis on what the problems or the solutions are.