Opus 4.6 is comparable to a mid-level developer.

Not really...

Yes, it pays attention to certain details that humans will tend to flub, so it's better than juniors when it comes to that...

But broadly speaking, it's a moron. It's like a junior dev pasting 15 year old stack overflow answers into a project, but better at making it fit in, but still doing pretty dumb approaches.

I spent a bunch of tokens to try to get Opus 4.7 to do a task for me last week. The result had mistakes and the test case that should be near instant took 3 minutes to complete (indicating that a user would be staring at a spinner for 3 minutes). It did save me the trouble of trying to figure out the details basic structure of the thing I was going to interact with (the documentation was dense and lacking specific examples, and Opus did output something that let me see how it basically worked in a to-the-point way), but I had to rewrite the "meat" of the task to get correct execution in under a second.

In the future you’ll probably have Opus 7.5 or some shit, which will be at a mega-senior

My impression has been less about it being more "senior" over time and more about being able to consistently deliver junior level work for longer amounts of output. Error rate remains problematic so you end up with more to review that in a way tortuously "looks right" for longer. When it digs itself into a hole, it's very bad at trying to amend the mess that has accumulated.