/Tech4h ago

Claude Fable 5 Refuses All 200 ProgramBench Tasks on Vals.ai Leaderboard

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Lisan al Gaib@scaling01#1215inTech

Fable 5 refused 200 out of 200 ProgramBench tasks lmao

4:07 PM · Jun 11, 2026 · 60.7K Views
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Many users criticized Claude Fable 5 for refusing every ProgramBench task, calling its excessive guardrails comically overdone and making the model impractical or unusable despite the cost.

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22 comments with sentiment.
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Lisan al Gaib@scaling01

https://www.vals.ai/benchmarks/programbench

Lisan al Gaib@scaling01

Fable 5 refused 200 out of 200 ProgramBench tasks lmao

4hViews 5.3KLikes 8Bookmarks 1
LIKES11REPLIES1
Naga@_Nagaa____

@scaling01 Lives up to its name ig

3hViews 412Likes 11
Shreshth Saini@shreshthsaini

@scaling01 You can't lose a battle if you refuse to fight it!

3hViews 445Likes 5
Chris Allen@theodorvaryag

@scaling01 @usr_bin_roygbiv

4hViews 19Likes 2
Conor@jconorgrogan

@scaling01 Absolutely should not be rated as NA. Should be rated at 0

3hViews 218Likes 2
MRLN@mrlnonai

@scaling01 and still they CHARGE for it

4hViews 180Likes 2
Qwinah@MaaSonder

@scaling01 Guardrails so high we can’t even use it for anything except one prompting knock off games.

4hViews 247Likes 1
Đoc@ponzibaron

@scaling01 Lollll

4hViews 70Likes 2
Maciej Pióro 𐙼@maciejpioro

@scaling01 Acc is 0/0, we've literally reached singularity.

4hViews 217Likes 1
Greg@greghappens

@scaling01 I haven’t been able to get it to do any besides answer basic ass questions

3hViews 423
Mahaoo@mahaoo_ASI

@scaling01 haha similar to my experience with the model thus far

unfortunately, because when it doesn't refuse its great actually

4hViews 350
Ed@edinwaw

@scaling01 You can't beat someone who is not competing. Smart move from Antrophic.

3hViews 307
uboa97@uboa97

@scaling01 “you can just not do things” -claude fable 5

3hViews 273
Igor@igorimx

@scaling01 Hey, at least it was nice enough not to charge you 🤣

3hViews 257
Prathmesh@psv2522

@scaling01 wait why would you run fable on benchmarks??

Wouldn't the whole thing leak?

2hViews 233
Pino@pinocookies

@scaling01 Only if @elder_plinius released his prompt we would actually be getting proper benchmarks on this thing.

4hViews 135
An0n@an0n_an0n_an0n

@scaling01 It still leads in every other benchmark that http://Vals.ai has for coding so one could assume it still would win there too?

4hViews 67
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