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Re:Claude Fable 5.2 and Mythos 5.2 by postalcoder on Monday November 09, 2026 @02:42PM (#50430766)
I’ve had a chance to use fable 5.2. Some observations:

- Anthropic is finally well balanced across models. Meaning: Opus 5.5 is so good that I do not feel Fable FOMO as I did when they were paired with Opus 4.8/5. And Sonnet sometimes makes me forget about Opus.

- Fable is good, but you really have to push the ambition of your prompt in order to see proper separation from Opus 5.5.

- It’s way faster and more reliable: one of the worst things about fable 5.1 was how slow it was an, on top of that, how frequently it would suffer from max output token overflows. I got none of these issues with 5.2.

- Fable is truly exceptional at drawing now. Fable’s ability to render an image with JavaScript actually has me questioning the value of dedicated image models. I prefer the images I’ve gotten fable/opus to make for me over the gpt-image lineup, it’s wild to think we’re at this point.

Re:Claude Fable 5.2 and Mythos 5.2 by hungryhobbit on Monday November 09, 2026 @03:06PM (#50431162)
And none of it matters ... because just as soon as you are happy with things "balanced across models" Anthropic will nerf the models you were happy with, and force you to use new and more expensive ones.
Re:Claude Fable 5.2 and Mythos 5.2 by wolttam on Monday November 09, 2026 @03:07PM (#50431178)
> Fable is good, but you really have to push the ambition of your prompt in order to see proper separation from Opus 5.5.

I love seeing this verbalized. We are pretty much at the point that increased model capability will only have utility to folks that are willing to let go of even more understanding of whatever the model is producing.

The best models can/will produce a year's worth of output that would take several days to weeks to properly understand in the span of an afternoon.

For everyone that still wants to feel like they own the end result, just use the lesser models with less ambitious tasks.

Big caveat: I think this mainly applies to coding. I would still like the best models possible to be working on e.g. new drug research to cure our various ailments.

Re:Claude Fable 5.2 and Mythos 5.2 by bobson381 on Monday November 09, 2026 @03:49PM (#50431904)
When you get good enough headphones, you can start to hear the limitations of the equipment stuff was recorded on. I wonder if this is like that
Re:Claude Fable 5.2 and Mythos 5.2 by gwerbin on Monday November 09, 2026 @03:08PM (#50431198)
Does Fable outperform Opus for data science work? Not just "iterate on this XGBoost model" but actually looking at a problem and designing and carrying out a short-term R&D program including probability modeling, model fitting diagnostics, how to respond to various kinds of results, how to interpret/reason about what it finds, etc. That's really where I saw all the models perform poorly, and where I saw the first big step increase from Opus 5 (pre-5.5) to Fable. But then Opus 5.5 came out and I haven't needed Fable since. Mind you, I'm doing slightly different work (and I'm very much "in the loop" still), but it's really amazing, I now have a powerful data science AI assistant that not only can write any script I need it to (including some scripts I didn't even realize I needed), and it has an encyclopedic knowledge of everything ever, and it constantly checks me on oversights, it handily derives expressions and clever model reparameterizations, and it has great insight into model behavior + amazing ability come up with ad-hoc experiments and tests that would have taken me all afternoon to even think of, let alone implement by hand. It's not at the scared-to-lose-my-job phase yet, but it's become a tremendous force multiplier for a smaller data team.
Re:Claude Fable 5.2 and Mythos 5.2 by acbart on Monday November 09, 2026 @03:39PM (#50431729)
I'm teaching "Data Science" to computer science majors next spring, and I'm overwhelmed by the prospect of what to teach them in the age of AI. It seems like Fable already way outperforms anything I could historically expect my students to do at the end of the semester, and perhaps even outperforms me. I can describe a vague analysis on the data, and it will handle every step: transformation, preliminary analysis, formulating more precise questions, creating visualizations, running statistical tests, interpreting results, thinking about stakeholders... And in some of those steps, it finds things that I might not have considered.

I wish I had a bigger N so I could rely on that experience a bit more, but it sure does feel like I'm not really contributing anything in terms of "Data Science expertise" in my own research right now.

Re:Claude Fable 5.2 and Mythos 5.2 by estetlinus on Monday November 09, 2026 @04:24PM (#50432386)
From my experience working with data scientists, it outperforms humans on an extreme level. I’ve seen so much bad data science, and here I have a model that can do all of that from one prompt. It is getting really good on finding caveats in data too.
Re:Claude Fable 5.2 and Mythos 5.2 by porker on Monday November 09, 2026 @03:55PM (#50431997)
I mean I found Fable 5.1 outperformed Opus 5.5 for data science, so I expect 5.2 to.

But then I'm someone who hasn't found Opus 5.5 good for much beyond web UIs and related frontend development. I find it more forgetful than GPT-5.6 or 6.1 or Fable, so despite having a 1M context window it gets lost in a big codebase or goes of target. Opus 5.5 doesn't manage agents particularly well IMO.

I'm surrounded by people raving about Opus 5.5 and God only knows why I'm not getting their results.

Re:Claude Fable 5.2 and Mythos 5.2 by vunderba on Monday November 09, 2026 @03:23PM (#50431455)
> Fable is exceptional at drawing. It’s ability to render an image with JavaScript actually has me questioning the value of dedicated image models

I’ve been shifting away from using more traditional GenAI models in favor of just giving LLMs access to a custom drawing language (LOGO-like) to generate imagery and its been going shockingly well - Opus 5.5 in particular.

I put together a simple LLM driven skill that creates old adventure game (EGA) environments from simple pencil sketches and it works really well. And being procedural, they're much easier to make surgical changes to without degradation.

https://kq-styles.specr.net

Re:Claude Fable 5.2 and Mythos 5.2 by MadameMinty on Monday November 09, 2026 @03:31PM (#50431602)
Charming!
Re:Claude Fable 5.2 and Mythos 5.2 by trcf23 on Monday November 09, 2026 @03:45PM (#50431823)
how do you use Fable for drawing? directly editing a .svg or through claude design/or something else?
Re:Claude Fable 5.2 and Mythos 5.2 by postalcoder on Monday November 09, 2026 @03:54PM (#50431986)
Tell it to draw a picture of something with JavaScript in the style you desire. It helps to provide it with reference images.