/Tech3h ago

Claude Fable 5 Passes GardenPathBench, First Model to Succeed

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#1888

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Nathan is sometimes at Summer Camp (say hi👋) 🔎#1888

fabian@fabianstelzer

OMG!

Fable passed my GardenPathBench.

Which is really just one question, but NO model so far could do it.

You might think this is a stupid question but it requires a specific understanding of syntax/semantics (ie language!) which LLMs ironically have been very bad at!

Claude@claudeai

Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

Its capabilities exceed those of any model we’ve ever made generally available.

10:53 AM · Jun 9, 2026 · 2K Views

/Tech3h ago

Claude Fable 5 Passes GardenPathBench, First Model to Succeed

217362K

#1888

Original post

Nathan is sometimes at Summer Camp (say hi👋) 🔎#1888

fabian@fabianstelzer

OMG!

Fable passed my GardenPathBench.

Which is really just one question, but NO model so far could do it.

You might think this is a stupid question but it requires a specific understanding of syntax/semantics (ie language!) which LLMs ironically have been very bad at!

Claude@claudeai

Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

Its capabilities exceed those of any model we’ve ever made generally available.

10:53 AM · Jun 9, 2026 · 2K Views

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Users praise Claude Fable 5 passing GardenPathBench as really cool because it shows advanced syntax understanding.

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fabian@fabianstelzer

Fable on why it’s hard for LLMs (and actually humans) to conceive of new garden path sentences:

3h3702

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Chris@ChrisBarnes3D

@fabianstelzer that's really cool

3h461

fabian@fabianstelzer

@ChrisBarnes3D yeah it’s a deceptively hard problem and I’ve been trying it with every new model since GPT2 😅

3h201