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Claude Fable 5

anthropic.com

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Re: Claude Fable 5

#491

Post by gpugreg »

mohsen1 wrote: post #436

It seems like Fable will refuse to do any work when it comes to developing LLMs or even asking questions about topics related to LLM. Simple things like asking to explain a paper fails! From the model card: In light of the ability of recent models to accelerate their own development, we've implemented new interventions that limit Claude's effectiveness for requests targeting frontier LLM development (for example, on…

Anthropic probably trained Mythos on their own code and found that it is too got at reproducing it.

Re: Claude Fable 5

#492

Post by cute_boi »

Used it for simple task and I got this message.

Fable 5's safety measures flagged this message. They may flag safe, normal content as well

Re: Claude Fable 5

#493

Post by Chance-Device »

mohsen1 wrote: post #436

It seems like Fable will refuse to do any work when it comes to developing LLMs or even asking questions about topics related to LLM. Simple things like asking to explain a paper fails! From the model card: In light of the ability of recent models to accelerate their own development, we've implemented new interventions that limit Claude's effectiveness for requests targeting frontier LLM development (for example, on…

I was wondering when something like this would happen. I got my first and only two content violation warnings in Claude Code last week when asking it about something ML related. It was a real head scratcher because I couldn’t figure out what about the requests could have violated anything.

Might be worth going back and taking a harder look at what I was asking it about if it somehow triggered a “forbidden knowledge” alert. Or maybe it was just a random bug.

Re: Claude Fable 5

#494

Post by raffael_de »

simonw wrote: post #46

Pelican for Fable 5 on default settings is a clear improvement on Opus 4.8 Fable 5 default: https://gist.github.com/simonw/036bee5a703e7ec84e34efa974438... Opus 4.8 (the "max" one is closest to Fable): https://simonwillison.net/2026/May/28/claude-opus-4-8/#and-s... Now here are the Fable pelicans for all five of the thinking effort levels - low, medium, high, xhigh, max: https://tools.simonwillison.net/markdown-svg-r…

I find it quite interesting that while the picture looks better the more advanced the model is, but apparently none so far "understands" that the pelicans legs are on both sides of the bike / top bar.

Re: Claude Fable 5

#495

Post by renjimen »

unsupp0rted wrote: post #374

> Drug design: Using Mythos 5, our internal protein design experts accelerated aspects of the drug design process by around ten times. In one example, they found that Mythos 5, with protein design and bioinformatics tools but no human assistance, matches or beats skilled human operators. In doing so, the model executes all of the tasks that are normally completed by a scientist: choosing binding sites, selecting and…

Drug design isn't the bottleneck anymore, it's trials. Still cool they can do this with a general purpose model though.

Re: Claude Fable 5

#496

Post by iillexial »

frevib wrote: post #83

At this point Anthropic is a pure marketing and PR company. Super catchy names like Opus, Mythos and Fable trying to get you to think that these software products are actually super-human life changing experiences. Boris Cherny coming to HN “Hi! it’s Boris from the Claude Code team” to get real tech people’s goodwill. From Opus 4.6 there are no noticeable improvements for me in code generation. It works very well, ti…

>Hey! Boris from the Claude Code team!

>TOP 5 METHODS FROM BORIS ON HOW TO SPEND MORE MONEY ON TOKENS

>Boris from Claude just told he doesn't prompt anymore. He LOOPS instead

>"chatgpt has gotten soooo much better with the latest update."

>"codex is the best AI coding product and we want to make it easy to try."

Karpathy about Fable 5:

>"You can give it a lot more ambitious tasks than what you're used to, the model "gets it""

Sam Altman about gpt-5.4:

>In my experience, it "gets what to do"

What a time to be alive. Models are great, but all the slop, marketing, and fakeness around them is just unbearable.

Re: Claude Fable 5

#499

Post by spaceman_2020 »

eggbrain wrote: post #24

For those of us on subscription plans: * From today through June 22, Fable 5 is included on Pro, Max, Team, and seat-based Enterprise plans at no extra cost. * On June 23, we’ll remove Fable 5 from those plans. Using it after that will require usage credits. If capacity allows, we’ll extend the included window. * After this point—when sufficient capacity allows us to do so—we aim to restore Fable 5 as a standard part…

Kimi 2.6 has been my workhorse now. It's as good as Opus 4.6, which, to me, was the last "useful" Claude model.

The newer models are smarter but really ficklle and hard to get meaningful work out of

4.6 was a workhorse

Re: Claude Fable 5

#500

Post by timmytokyo »

brusselssprouts wrote: post #334

I had it review a single, large commit with /code-review. It burned through over $50 in API calls, ran my account balance out, and output nothing. The fable part appears to be that it's affordable by mere mortals. Anthropic support told me "too bad" when I requested a refund.

You pulled the arm of the slot machine and discovered why they call it the one-armed bandit.
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