I've noticed this too.
Over the last 6 months I've been creating some truly mindblowing apps, apps that feel like they are entirely out of reach for today's Claude.
I've also noticed that if I do some assisted coding at 4-5am UK time, and then perform the same actions at 3-8pm UK time the results are vastly different:
- It takes much much longer to consider my input and work out a response
- Any response given has to be thoroughly considered (I've had to rollback changes)
- Changes scoped in the plan are stubbed or missing entirely
I've put it down to two things (a) Early enshitification, perhaps they simply don't feel the need to provide a consistent level of service because any observation of performance is highly subjective and (b) oversubscription, they scored massive marketing points by being blacklisted by US DoD (despite being integrated into many systems in a different capacity)