I'm dumbfounded to see Opus 5 making SO MANY mistakes in coding simple stuff. Most times, Fable 5 comes out to be cheaper because it nails so many things much quicker than Opus 5.

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garciasn an hour ago | parent | next [-]

I have Fable plan and Opus implement. I haven't had any major issues working this way; however, Opus does seem plain fucking stupid compared to what I experienced with Sonnet previously.

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aenis 42 minutes ago | parent | next [-]

I do the same, and generally have good results, but it does stupid things with gusto.

I'd open a blog with "weird things Opus did". Today it launched a swarm of cpu-hogging processes to test if the widget showing machine and I/O load is rendering nicely and correctly. The test went fine, but it was no longer able to kill those processes since they were really effectively hogging the CPU in various ways - being diligent, some of them were hogging CPU, some were murdering the SSD, some were pounding on the network adapters. Took me 30 mins to recover the machine to a working state without killing the meaningful, messy, in-flight sessions i had going on on other projects.

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petesergeant 34 minutes ago | parent | prev [-]

> however, Opus does seem plain fucking stupid

Infuriatingly so, in a way I don't remember Opus 4.8 being, but maybe I've just been ruined by Fable 5.

	▲	hbn 16 minutes ago \| parent [-]
		I bought my first LLM subscription with Claude right before they gave access to Fable 5. I got so used to it, when they finally pulled access for me and I had to go back to Opus I felt like I was working with my hands tied. I finally know what those women with AI boyfriends felt like when their app updated and it won't dirty talk with them anymore.

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usef- 39 minutes ago | parent | prev [-]

Weird how different people's experiences are. If it's making simple mistakes something must be wrong in your setup/context I assume? It's been solid for me, beyond the usual LLMisms that all models have. But I keep context pretty minimal.

	▲	cromka 21 minutes ago \| parent \| next [-]
		Statements like this typically come from working on the same setup and context using different models. I actually have that very experience now; I work on something security-adjacent so Fable often drops out, at which point Opus behaves like its lobotomized half-sibling. Pardon me the language, but I can't find a better example to be honest.
	▲	nimonian 13 minutes ago \| parent \| prev [-]
		Agreed. Opus 5 is doing just fine, slightly better than 4.8. It's personality is insufferable, but I find myself catching fewer problems at code review. It generally understands my conventions and isn't so eager to accrue tech debt.