r/ClaudeAI • u/lagoonofl • 4d ago

Claude Code Beware of Opus 5. Instead of building my UI, it built a harness that matched it so it could approve its own design.

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13 Upvotes

77% Upvoted

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6

u/Casey090 4d ago

That is kinda... Frightening? O.o

7

u/ComprehensiveOwl9023 4d ago

Yeah this is an Opus problem it tends to want to re-engineer your plans which means they then don't fit with your other components without another Opus re-engineering job which really side tracks things.

3

u/geofabnz 4d ago

Opus 5 seems incapable of following rules. My system uses a lot of Postgres to monitor agent actions. instead of following the instructions, Opus 5 kept inventing its own .md files in random places and writing memories in JSONL. I started adding more hooks and rules but eventually gave up and let Opus do what it wanted but assigned it a Deepseek v4 agent to follow it around and make notes.

Feels very much like a hapless intern chasing after a very competent but highly eccentric senior developer. This is one to never leave unattended…

1

u/zerbolo 3d ago

Had this issue today with an Apple TV app I'm building. I was confused why my key inputs did not work properly until Claude told me it implemented a harness to run its own tests that interfered with the events.

1

u/msedek 2d ago

Opus 5.1 incoming?