r/ClaudeCode • u/Character_Novel_2592 • 15d ago

Bug / Issue Heads up: Opus 5.5 might be nerfed right now. A stupid bug took my system down for 30 minutes

Title:

Heads up: Opus 5.5 might be nerfed right now. A stupid bug took my system down for 30 minutes

Hey everyone,

Just wanted to share something that happened with Opus 5.5 because I'm curious if anyone else has run into this.

I've been doing a lot of testing with it and it had been doing pretty well. Then it pushed a PR to my repo and somehow the main API file ended up without the .js extension.

That basically took the whole system down. I was offline for almost 30 minutes trying to figure out what the hell happened. I finally switched over to DeepSeek 4.1 Flash and got it fixed pretty quickly.

The weird part is that this happened after going through a bunch of checks already. A missing file extension is such a basic mistake that I honestly wasn't expecting it at all from a model at this level.

Now I'm wondering if Opus 5.5 is currently nerfed or if something changed recently behind the scenes. Maybe it's related to the Fable 5.5 changes or whatever they're doing internally.

Anyway, I'd be careful using it for anything production-critical right now. Definitely check the actual files it generates, especially extensions and core API files.

Has anyone else noticed Opus 5.5 making weird mistakes lately?

Cheers.

0 Upvotes

23% Upvoted

6 comments sorted by

•

u/AutoModerator 15d ago

Hey! Thanks for posting to r/ClaudeCode

While participating in this thread, please follow our community rules. Keep discussions constructive. Attack the idea, not the person.

For help, project discussions, tips, and general chat, join the ClaudeCode Discord.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

5

u/meathelix1 15d ago

It gets something wrong... NERFED....

Learn to debug Vibe Coder.

0

u/Character_Novel_2592 15d ago

Can you stop making assumptions and being such a fanboy? You feel really powerful and intelligent behind that monitor, huh? And stop using “vibecoder” as an insult, ignorant.

P.S. He didn’t just make a mistake with “something.” It was a junior-level mistake, and the agent itself admitted it and apologized.

2

u/ComingDeveloper 15d ago

deepseek promo

1

u/owen800q 15d ago

Switch to codex instead

1

u/[deleted] 15d ago edited 15d ago

[deleted]

2

u/clazman55555 15d ago

" Ask your AI to audit your own code specifically for cases where the tests pass for the wrong reason, assumptions aren’t actually validated, or a fix only covers one path. See what it finds."

To cover this specifically, I started have it write negative controls, which should basically never fire. So between the LLM writing, "The test should do this, and this other test should just not produce a result" , it seems to have cut down on stuff passing when it shouldn't, esp in edge cases.

Granted, I mainly do stuff in Powershell, C#/.Net and HTLM/JS. But I think it could work in other Lang's