Major drop in intelligence across most major models.

As of mid Apr 2026, I have noticed every model has had a major intelligence drop. And no I'm not talking about just ChatGPT. Everything from Claude(Even Sonnet along with Opus), Gemini, z.ai, Grok all seem to ignore basic instructions, struggle at simple tasks, take very long to respond, and the output seems deliberately shortened and very shallow. Almost like it's in a "grumpy" mode. I tried this in incognito mode so it's not my customization or memory influencing this. It's like they deliberately want you to stop using their service. I guess our data is no longer needed.