I have found this to be true too and I thought I was the only one. Everyone is praising 4.6 and while it’s great at agentic and tool use, it does not follow instructions as cleanly as 4.5 - I also feel like 4.5 was just way more efficient too
I use 4.6 as the brain and then handoff to a more rigid llm like GPT 5.2 or Opus 4.5