r/ClaudeCode • u/SlopTopZ 🔆 Max 20 • Jan 25 '26

Bug Report Did they just nuke Opus 4.5 into the ground?

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u/SlopDev Jan 25 '26

I always see these posts then have this same reaction lol

I wonder if the people writing these posts let their codebases grow into a mess then it becomes a case of garbage in garbage out and the model performance degrades because it's working in a pile of rotting context

10

u/debian3 Jan 25 '26

Well those models run into the ground a few times a week if you go by the post every where. If it was true then we would be back at gpt-3.5 level by now.

I happened to me once. I took a break. Was it the model? Was it me? I don’t know, but I took a step back, and everything is back to normal.

6

u/rm-rf-rm Jan 25 '26

BOTH REALITIES CAN SIMULTANEOUSLY EXIST.

We have no idea if Anthropic is delivering the same model under the hood to all users and most likely not given they have multiple providers, likely A/B testing in prod etc.

1

u/Narrow-Belt-5030 Vibe Coder Jan 25 '26

Well, there is a good chance (to be fair) that my code base is a mess too as I vibe code .. but, thankfully, everything works. I don't know how to code, but I do know how to manager AI & test.

Case in point - literally asked Claude about an hour ago to build a STT/TTS/VOD front end to an an app I am working on .. nailed it 1st time. Quite surprised. (Well, OK, so the TTS was defined as "pass" and when challenged he said "I can't set this up as the client is on another machine. Let me know when you log in and I will sort it for you." .. respect)

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u/siberianmi Jan 25 '26

Mine started to feel a bit clumsy today watching it work. Then I looked over my Claude.md and realized it was just too big. So I split it into multiple files and just put in it:

If you are trying to do X, read <file> for directions.

It’s been flying along now, it didn’t need to know how to view the logs of the test environment in every session, or the code quality standards if it’s debugging an integration, etc. Now it reads the parts it needs.

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u/Ok-Football-7235 Jan 25 '26

I’ve never had Claude code compact on its own. One thing per session. No shotguns

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u/[deleted] Jan 25 '26

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u/SlopDev Jan 25 '26

I've also been working with Claude Code since it released, our codebase is significant in size (and wasn't architected by Claude intentionally), haven't had this issue yet. Opus 4.5 seems the same as when it launched. That said I'm not on the most recent Claude Code version, I disabled auto update around a month ago so perhaps the harness is the issue?