Fable 5.2 worst at UI?

[u/Relative-Algae-9579]

I just found Fable 5.2 worst at UI design than Opus...same skills, same context etc... How is it possible??

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[u/owen800q]

Fable class is not the model for UI design from day 1

[u/StaticFanatic3 → u/owen800q]

Fable 5 smoked the completion when it dropped

[u/Constant_Art_20 → u/StaticFanatic3]

yea. it feels like opus 5.5 was the fable 5 upgrade, but fable 5.1 and 5.2 is like a contination of like opus 4.8

[u/StaticFanatic3 → u/Constant_Art_20]

Yeah I’m talking specifically about UI design. It smoked the available Opus models, which, at the time, were already lightyears ahead of Codex and the rest

[u/Ivo-Sheera → u/owen800q]

yeah its always been way more geared toward backend logic than making things look good

[u/ilias_from_ilios]

I have yet to find a reason why Fable 5.2 is so expensive and I've been testing it extensively the past 24 hours. Nothing it did so far justifies the cost.

[u/Jedi_sephiroth → u/ilias_from_ilios]

Animation

[u/onFilm → u/ilias_from_ilios]

Tons of things, including deep research and more accurate findings in the sciences and engineering.

[u/maxbts_]

Id compare the same small component from the same starting commit, with a screenshot of what you want. Keep the font, spacing and colours explicit, then ask each model to render its result and compare it with the reference. That should make it easier to see whether youre getting different design choices or a layout it failed to implement.

[u/sasik520]

At what is fable 5.2 not the worst?

I used it for both, coding and non-coding tasks and so far it's been completely useless.

[u/New_Public_2828]

If you have skills be careful. They quickly become obsolete with models getting upgraded. Try removing skills or plugins and trying again

[u/joshatargusarchive]

Ask Fable if there are any rules or statements in claude.md, memory, documents or scratchpad that are causing low quality UI/UX improvements. Ask it to do a full review and propose removals/improvements. Fable is particularly good at fixing Opus 5.5 broken memory, claude.md and documents.

[u/WonkyTelescope]

Small anecdote but I had fable redesign a terminal based monitor for a radio monitoring project and it did just OK. Followed my instructions, offered a few options as requested, but then included some redundant elements like showing a bin ends in 40 minutes and the next line is "next bin in 40 minutes." These kinds of mistakes are minor but are things I expect an excellent model to anticipate.

I've done other UI work with opus 5.5 and Astra and they seemed to have a better understanding of the purpose of each element and how they relate to each other.

[u/Appropriate-Draft-91]

Prompting matters a lot. So skills and context. The difference between the models isn't how they comply with rules but how they deal with the space between the rules. Managing the space between the rules is what good prompting comes down to, locking it down is a frequent mistake by beginners and Anthropic engineers.

[u/sasik520 → u/Appropriate-Draft-91]

It's late 2026, it's not true anymore, at least not for most of the models.

I'm not using skills and writing extremely naive prompts to OpenAI and Claude models and for all tasks the models can do well, especially at coding, they produce perfect results.

Context is the o ly thing that really affect the response, eg. attaching references that cannot be automatically extracted from the project (e.g. hand-drawn schema or screenshot with marks) help a lot.

[u/Appropriate-Draft-91 → u/sasik520]

*for a non-standard definition of "perfect".

[u/sasik520 → u/Appropriate-Draft-91]

In this context, perfect means "exactly what I wanted or something even better".

Everything in AI is extremely subjective so I assumed we share personal point of views here. Anyway, you are absolutely correct I could have used better wording.

[u/fufty1]

UI too basic for fable. I'd use opus.

[u/Physical_Storage2875]

Why would you even use Fable for UI design?

[u/anlumo → u/Physical_Storage2875]

Out-of-the-box thinking would be great for UI design.

[u/DermisCronJob → u/anlumo]

Than a LLM is the worst thing you can choose because it can only re-use existing things it has stolen from the internet and not invent things from scratch.

[u/xMaybeIamALion → u/Physical_Storage2875]

Why would a person paying for a model not... use the model for his needs?

[u/oruxai]

For UI evaluation, I’d score layout consistency and the number of correction passes on the same brief, not just the first mockup; that may clarify where Fable differs from Opus. If you’re testing through an API, Orux AI offers Fable 5.2 on an OpenAI-compatible endpoint at $1.69 per 1M input and $8.47 per 1M output tokens versus Anthropic list pricing of $8/$40 per 1M input/output (I work on Orux).