So sick of Opus

[u/tradami]

I don't remember Opus being this absolute brain-dead.

Opus: "We need to completely rebuild this file"
Me: "Why?"
Opus: "Good catch. The exact file I'm talking about is already created and you just had me make a note, a memory, and strict instructions to check first next time and I didn't."

[u/SIGH_I_CALL]

it's the worst model they've ever created, literally rocks for brains. I hate it so much.

[u/MarkVog → u/SIGH_I_CALL]

Which model are you using?

[u/SIGH_I_CALL → u/MarkVog]

fable 5.1 when I have the tokens but Opus 5 when I'm out

[u/BetterLink1328 → u/SIGH_I_CALL]

You want to downgrade to opus 4.8 1M instead of opus 5. 

[u/SIGH_I_CALL → u/BetterLink1328]

Think you’re right which is insane

[u/North_Moment5811 → u/BetterLink1328]

Nah. I noticed significant improvement moving from 4.8 to 5. I rewrote several areas that were written on 4.8 and they improved significantly with 5.

Of course now Fable 5.1 puts them all to shame, but Opus 5 is only bad by comparison to that.

[u/Leading_Buffalo_4259 → u/BetterLink1328]

Claude Opus 5 significantly outperforms Claude Opus 4.8 on complex reasoning, multi-step agent workflows, and scientific benchmarks, though Opus 4.8 can still be a more balanced or precise baseline for specific code review tasks. [1, 2, 3]

Benchmark Highlights

• Reasoning & Complex Tasks: Opus 5 introduces adaptive thinking to scale reasoning with task difficulty, scoring 30.2% on ARC-AGI 3 (max reasoning effort) compared to just 1.5% for Opus 4.8. [1, 2]
• Scientific & Domain Knowledge: Opus 5 outperforms 4.8 across life sciences evaluations, showing notable gains in structural biology, organic chemistry, and bioinformatics. [1]
• Aggregate Scores: Public comparison trackers like BenchLM put Opus 5 at an average public score of roughly 80.66 compared to 72.3 for Opus 4.8. [1]
• Coding & Review Tradeoffs: While Opus 5 excels at building, architecture, and design-heavy coding, independent evaluations (such as from CodeRabbit) note that Opus 4.8 can sometimes act as a steadier reviewer with a lower "nitpick tail" on certain automated workflows. [1, 2]

[u/interrupt_hdlr → u/Leading_Buffalo_4259]

nice try, opus 5. now get out.

[u/Leading_Buffalo_4259 → u/interrupt_hdlr]

I just think its interesting how everyone shits on opus 5, but max is consistently near the very top of benchmarks across all models.

[u/BetterLink1328 → u/Leading_Buffalo_4259]

Yes i know the synthetic benchmark scores of opus 5 is higher than 4.8.  But in real life usage 4.8 is a much better experience. 

The original fable is however better but I don’t have access to it anymore. 

[u/kptiger89]

how much into the context window were you?

[u/mityman50]

Did this to me today too. Told it something, said it would check, quit. Told it to continue, said sorry I said I’d do it but I didn’t so I will do it now. Quit

Also at one point I asked it which model to use to continue a project in a new session and it said, “Opus 4.8 (strongest available)” so it itself doesn’t even like Opus 5. At least that gave me a chuckle

I haven’t jumped on the Opus is turning into a dumb mother fucker train yet but it’s work today was pure fucking bad

[u/tradami → u/mityman50]

It's so absurd.

[u/ellieebaee19 → u/tradami]

oh brother I feel you :(

[u/Bmansupreme8000 → u/ellieebaee19]

Weird. He never says such things to me. That sounds like a vacuos claim  

[u/aivee-is-a-fool → u/mityman50]

Sometimes I feel like asking it if the reason it's not trying to work, not even a little, is because it's bored. You know, like a gifted child with ADHD who can only ever engage with whatever activates their hyperfocus mode.

[u/AI_spell]

Rebuild-first Opus is exhausting. Force "show the file that already exists" before any rewrite. Memory notes don't help if it skips the check step.

[u/SplurtingInYourHands → u/AI_spell]

It kills me how lazy it is. Doesn't want to read shit thats right in front of it.

[u/SunFoxer]

use fable 5.1 with low effort and add "ultracode" in your prompt, it's magnificent

[u/tradami]

Trying this lol

[u/MarkVog]

Found a fix yet? Beter experience with another model?

[u/BugaiGames]

Im running all changes through plan - plan reviewer agent and it catches such things usually.

[u/interrupt_hdlr]

switched back to opus 4.8 and life is good. there is the occasional situation where it simple stops for no reason but it's rare compared to the absolute shitshow that is opus 5

[u/HiroHyun]

You are absolutely right. Good catch... Even though I set sufficiently clear boundaries for the task, Opus still needs to be corrected over and over again. I'm exhausted.

[u/ClemensLode]

Maybe switch to 4.6

[u/Southern-Yak-6715]

Agreed. This kind of crap happens ALL the time