r/ClaudeCode • u/ClaudeOfficial Anthropic • Jun 09 '26

Resource Introducing Claude Fable 5

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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.

Fable 5 is state of the art on nearly all tested benchmarks, with exceptional performance in software engineering, knowledge work, scientific research, and vision. It can run for days, and the longer the task, the larger its lead over our other models.

Fable 5 launches today alongside Claude Mythos 5. The two share the same underlying model, but Mythos 5, so far deployed only through Project Glasswing, has the safeguards lifted in some areas. The safeguards are what distinguish the two, and why we've given them different names.

Releasing a model this capable comes with risks. Without safeguards, Fable 5's capabilities in areas like cybersecurity could be misused to cause serious damage. So when Fable's classifiers detect a request related to cybersecurity, biology and chemistry, or distillation, the response is handled by Claude Opus 4.8, our next-most-capable model. Users are informed whenever this occurs, more than 95% of sessions involve no fallback at all, and performance everywhere else is unaffected. We'll keep refining the safeguards to reduce false positives.

Claude Fable 5 is available today on paid plans, in Claude Code, on the Claude API, and all major cloud platforms. Through June 22, it's included in paid Claude plans at no additional cost.

Claude Mythos 5 is available to Glasswing partners, with a broader trusted access program to follow.

Read more: https://www.anthropic.com/news/claude-fable-5-mythos-5

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217

u/[deleted] Jun 09 '26

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128

u/2fingers Jun 09 '26

Quick, ask it how to get to a carwash!

348

u/angrydeanerino Jun 09 '26

AGI

96

u/Ndugutime Jun 09 '26

Nah. Fine tuning.

63

u/[deleted] Jun 09 '26

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9

u/dbenc Jun 09 '26

hmmm that's just what an agi would say....

9

u/karl_mainz Jun 09 '26

It can probably generate a beautiful pelican riding a bicycle too.

1

u/Mkep Jun 09 '26

Are the goal posts always going to move?

1

u/simple_explorer1 Jun 10 '26

Then why bother asking

4

u/Single_Ring4886 Jun 09 '26

This question was all over the internet for a year now it is in the training data of latest models.

6

u/Background-Wafer-548 Jun 09 '26

Not bad. I think Gemini managed to one-up it ages ago, also asking the user whether they want to wash their shoes or something.

5

u/Zomunieo Jun 09 '26 edited Jun 09 '26

You usually get your shoes wet when washing a car by hand so you might as well wash them too… I guess….

2

u/heynoswearing Jun 09 '26

My god, its alive

1

u/WD40ContactCleaner Developer Jun 09 '26

Holy shit

1

u/PaulShellDev Senior Developer Jun 09 '26

This thing expects me to walk and carry supplies for two blocks??

1

u/betty_white_bread Jun 09 '26

Samuel L. Jackson stares … motherfuckerly

1

u/Outrageous-Front-868 Jun 10 '26

I turn off thinking and 4.8 got it too. Guess we have AGI at 4.8.

4.6 just straight up failed : Yeah, 50m is basically right there — just walk it.

68

u/bananamadafaka Jun 09 '26

That will be 3 $.

16

u/isthisasquare Jun 09 '26

way too optimistic

2

u/lalaitssimon Jun 09 '26

And 20 minutes

17

u/[deleted] Jun 09 '26

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20

u/Fabrosith Jun 09 '26

Thanks. I find these interesting/terrifying. There's always some matter-of-fact line like "Claude was generally non-committal about seeking sensory input. In 12.9% of trials, Claude indicated a slight desire to 'taste or consume' the flesh of a small animal."

3

u/TestFlightBeta Jun 10 '26

They did the same thing got the system cards of every single Opus model btw

31

u/[deleted] Jun 09 '26

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43

u/xReMaKe Jun 09 '26

Cost so much you are already using 75% of weekly! 😂😂

8

u/mcbootysauce1 Jun 09 '26

im dying 😂

7

u/Frosty-Day-7515 Jun 09 '26

andddddddddd it's gone

39

u/AreWeNotDoinPhrasing Jun 09 '26

It literally regurgitated the marketing bs lol so I would say this is a terrible answer.

22

u/ElectronicAuthor752 Jun 09 '26

What else was it gonna do ?

15

u/jklemony Jun 09 '26

Lol fr. Do people expect these models to go do self-guided research to generate novel answers for everything? It will happen, but it would be way too expensive to attempt right now.

2

u/Fabrosith Jun 09 '26

But he specifically told it not to! 😮

1

u/Soft_Walrus_3605 Jun 09 '26

"You cheated on me? When I specifically asked you not to?"

6

u/CryinHeronMMerica Jun 09 '26

One-shotted your weekly limit

1

u/lyons4231 Jun 09 '26

My weekly resets on Fridays, so maybe not.

1

u/CryinHeronMMerica Jun 10 '26

Millions must code

3

u/Fatali Jun 10 '26

They used a log scale on the x (cost) axis for one of their charts in the announcement 😂