/Tech22h ago

FrontierCode benchmark shows Claude Fable 5 matches Claude Opus 4.8 peak accuracy at less than half the cost

At maximum settings, Fable 5 reaches 31% coding accuracy.

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Original post
Morgan@morganlinton

Fable low is better than Opus and GPT high.

Try it.

5:58 PM · Jun 10, 2026 · 5.3K Views
Sentiment

Some users praised Claude Fable models for strong FrontierCode accuracy results and balanced settings, while others dismissed the benchmarks as engineered bullshit and accused the company of blocking research access.

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40.0%
Neg
60.0%
10 comments with sentiment.
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William Stoner@noodle_saint_7

@ns123abc Humans are safe now by being cost competitive

22hViews 166
LIKES2
Marko@justsimplemarko

@ns123abc The craziest part is that this is just beginning

22hViews 133Likes 2
REPLIES1
Zeke Chan 🚢@zekeatchan

@morganlinton @timjang3 Most users won't have the time, resource or interest to invest into experiments like these so I'm really thankful you're working on it

4hViews 10Likes 1
EJ Lawless@elawless

@morganlinton Is this your experience?

5hViews 150Likes 1
Morgan@morganlinton

@danielendara Still experimenting, my own benchmarking tool should be finished soon so then I can do more systematic testing

5hViews 130Likes 1
Daniel Endara@danielendara

@morganlinton Interesting ... how do you determine this? I do understand and definitely there needs to be some dollar amount or some similar metric considers. Fable is awesome, but do you get the bang for the buck compared to GPT5.5 medium...

6hViews 146
Tim Jang@timjang3

@morganlinton fable is really good but this is a sus benchmark

6hViews 135
Morgan@morganlinton

@timjang3 It’s not a perfect benchmark so agree there

6hViews 121
Daniel Endara@danielendara

@morganlinton very cool Morgan! Looking forward to it.

5hViews 19Likes 1
Zeke Chan 🚢@zekeatchan

@morganlinton @timjang3 Looking forward to your release. Benchmarks are usually just to give a decent idea of capabilities. There are plenty of unique and edge cases where the benchmark is completely off if taken literally but it's still a very useful tool.

4hViews 14Likes 1
yacine@yacinekhoualdi

@ns123abc Man some of these benchmarks are engineered bullshit

22hViews 111Likes 1
Morgan@morganlinton

@elawless Yes, but I think Medium is the most optimal move, really good balance of thinking and token use, without the crazy tool calling you get with higher effort levels.

5hViews 66Likes 1
Val (osopher)@Valen_T_N

@ns123abc Everyone loves the democratization of intelligence (including slapping cushy names on capitalist objectives, like capitalizing competition in skills)

22hViews 127
Ashish@a_gangrade

@ns123abc Won't AI pricing come down, in a few years ? As the data center and power infra gets built out

22hViews 124
Morgan@morganlinton

@danielendara Ty Daniel! And somehow tonight came up with the perfect new name for it 🖖

5hViews 23Likes 1
Ryan Johnson@RyanWorkforceAI

@morganlinton And then there is Ultracode 😱

6hViews 49
Andrew Salzer@andrewjsalzer

@morganlinton i was looking at cursorbench and decided instead of using max and wasting usage i’m just going to use medium

6hViews 45
Morgan@morganlinton

@zekeatchan @timjang3 Ty Zeke! 🙏

4hViews 6Likes 1
Larry@nb666nn

@ns123abc ?

22hViews 4Likes 1
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