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Claude Fable 5

anthropic.com

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Re: Claude Fable 5

#561

Post by linsomniac »

AquinasCoder wrote: post #42

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 of subscription plans. We intend to do this…

I was just saying last week: If Opus 4.8 max is as good as we get, and we plateau there, I think I'd be fine with it.

For the stuff I've thrown at it, that configuration has done a really great job. Including 70+KLOC go proxy with extensive test suite, some retro games, and more.

Re: Claude Fable 5

#563

Post by gck1 »

izzylan wrote: post #397

I've been testing this out and I think my SWE career is dead in the water. Genuinely wondering what value I bring to my employer right now. What value I will bring in a few months when this gets cheaper. I think we're screwed. I may only be an SDE 2 at FAANG but I don't think I have promotion opportunities in my future anymore.

Your job is just going to change. You may or may not appreciate/enjoy what it becomes necessarily, but it doesn't mean that you are going to not have a job.

People underestimate how people hate looking at terminals and "weird looking combination of characters" even if they didn't have to write them. If anything, you will likely have more career opportunities in the future, than ever.

And if you get a chance to wet your fingers in cybersecurity - I would take it.

Re: Claude Fable 5

#564

Post by imdsm »

can't use it for code review

> Fable 5's safety measures flagged this message for cybersecurity or biology topics. They may flag safe, normal content as well. These measures let us bring you Mythos-level capability in other areas sooner, and we're working to refine them. Switched to Opus 4.8. Send feedback with /feedback or learn more

super

Re: Claude Fable 5

#565

Post by jp0001 »

bottlepalm wrote: post #377
dannyw wrote: post #255

Impressions from testing Fable 5 prior to launch: • My most noticeable immediate jump was in how its frontend design was much more intentionally crafted, and delightful without feeling like 'AI vibe coded'; with better end-user usability too. • In some internal agentic harnesses, it achieved better results with about half the tokens, making it cost the ~same as Opus 4.8 price-wise! The real price increase is less tha…

I just ran it on a tough reverse engineering problem I'm having that neither Claude Code 4.8 or ChatGPT Codex 5.5 could figure out. 30 minutes later Fable has it all figured out perfectly.

I asked it to write security tests for an app and I was downgraded to Opus 4.8. I'm approved for their cyber program!

Re: Claude Fable 5

#566

Post by stalfie »

Tried to benchmark ECG interpretation capabilities, and I hit the guardrails no matter what I do.

Incredibly frustrating that medical performance seems to be a victim of "biological risk" guardrails.

Re: Claude Fable 5

#567

Post by thothless »

bkjlblh wrote: post #220

> 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 building pretraining pipelines, distributed training infrastructure, or ML accelerator design). Using Claude to develop competing models already violates our Terms of Service, but enforcing this restrictio…

the gall of these companies to regulate your usage of stolen knowledge is absolutely hilarious.

and they want me to pay $100+ a month to be their training?

i hope we can find morality again.

Re: Claude Fable 5

#568

Post by clbrmbr »

cge wrote: post #326

The safety gates on this are extreme , and seem considerably wider than "cybersecurity and biology"; they seem to make it essentially unusable for scientists in a number of fields. I have, so far, been bumped back to Opus on 100% of my prompts. It appears it can be tripped by things as simple as a mention of equilibrium, or anything involving something that looks like chemical kinetics, even at an abstract level. Eve…

Can you share an example? I've been happily using Fable this afternoon and it just seems like the usual upgrade so far with no interruption to my (fairly standard) SWENG problems.

Re: Claude Fable 5

#569

Post by [deleted] »

jumploops wrote: post #446

It's interesting that we're seeing these gains when it seems Mythos/Fable is "just" a scaled up version of their existing architecture[0]. When GPT 4.5 launched, the gains compared to the model size didn't seem that great, leading some to believe that the only progress we'd see would come from RL. This model certainly has quite a "substantial amount of post-training and fine-tuning", but it's also based on a new pret…

[deleted]

Re: Claude Fable 5

#570

Post by alecco »

simonw wrote: post #534

I've spent enough time with this now in Claude Code (and Claude.ai and Claude Code for web) to have an opinion on Fable 5: it's a beast. I'm throwing some VERY difficult problems at at - things I've been dragging my heels on for months - and it's crunching through them very happily. One that I'm willing to share (albeit from just a week ago) - I built a Python library last week that bundles MicroPython compiled to WA…

I hate how the Instagram/TikTok/YouTube influencer cancer is getting into AI. With early access and all that.

It made sense for people doing proper and fair AI breakdowns waiting on an embargo, but now it's just slop I don't trust anymore.

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