I got Opus 5 lots of HTTP 529 errors. By switching to Fable 5, it seems to be working still.

4.8 for me. I can't afford the usage cost of switching to 5, but I never really noticed a difference to 4.7 when I tried it anyway.

The whole Opus family has exactly the same cost structure [1]. Since Opus 5 is smarter, you can use lower effort levels (= less tokens) making it cheaper to run than 4.8.

[1] https://platform.claude.com/docs/en/about-claude/pricing

5 definitely burns through my 5 hour quota quicker than 4.8 did.

yes. confirmed

now failing for me, esp auto mode classification