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Posted by lairv 22 hours ago

Claude Fable 5.2 and Mythos 5.2(www.anthropic.com)
797 points | 929 commentspage 6
rw2 8 hours ago|
WHo thinks Fable 5.2 is pretty similar to Fable 5.1 when it came out and it's just that 5.1 is so nerfed that a number shift make our perception think it's better.
mercnz 14 hours ago||
i've been trying to use sonnet and opus to keep my usage down on the low max plan, but i noticed today that somehow i'm 80% through my weeks usage. so i'm hesistant to even try fable 5.2 yet, but finding the right set point of usage vs model size has been a bit struggle for me, one of my biggest issues has been trying to pull back doing exhaustive testing or other such things that chew through context, and instead have programs that just measure things are working, but i continously seem to run into issues with claude wanting to repeat things for itself in an adhoc manner. i've tried fable directing opus or sonnet subagents, and the reverse. and i found that part of the issue with smaller models trying to direct subagents is that they over specified what they thought the problem was rather than the problem. like they'll have an "idea" about it which is wrong, and then try and feed that into the subagent.
drewnick 13 hours ago|
FWIW I got 2 resets on my Max plan today, the first in at least a month. You may want to check.
danmcr 19 hours ago||
The lack of transparency around model quality/usage limits on closed models makes me want to ditch them.

What I have learned is that any model from Anthropic/OpenAI is at it's absolute best right after release.

pohl 18 hours ago|
This isn’t really specific to LLMs, though, is it? Pretty much any modern SaaS product will silently siphon off some portion of requests off to stuff they’re A/B testing before release and you’ll not necessarily know about it.
lacoolj 20 hours ago||
Yet Opus 5.5 is only a few % under all of these benchmarks (cept the robotics and labor ones)

Do we need new benchmarks or are the models just plateauing in general? Or is it something I just don't see?

jeremyjjj 17 hours ago||
The same was said many times already. Like right before o1 and reasoning was released. Also, Opus 5.5 being so good definitely makes it hard to follow-up.

Finally, for coding the SOTA models are so good already - models shouldn’t be what’s holding anyone back!

andriy_koval 18 hours ago||
% improvement doesn't mean linear capability improvement.

New solved tests likely follow some polynomial/exponential complexity curve.

iammrpayments 21 hours ago||
Too expensive for me
ttul 21 hours ago|
Really? A $200/mo plan gives you an enormous amount of inference on this model.
LeBit 20 hours ago|||
200$USD is a lot of money for a lot of people.

It might explain why DeepSeek Flash v4.1 1017 is the most popular model at OpenRouter.

ttul 17 hours ago|||
I agree that's a lot of money for many people. But I just can't wrap my head around complaints about $200 a month to access that must computing power. It's worth $12,000 of API tokens (and that's without accounting for the three resets they granted today to many subscribers).

I would suggest calibrating what "a lot" means. In terms of dollars per unit of intelligence, it's extremely cost effective.

LeBit 13 hours ago|||
If Anthropic were telling you you were getting 500,000$ worth of compute for 5,000$ a month, would you still consider this a bargain?

People don’t care what the costs for the LLM providers are. They are paying for a service. 30$ a month is reasonable for a lot of devs. 100$ is a lot for many. 200$ is unreasonable for personal usage for most.

Everybody understands the economics are all skewed and this tech requires a lot of resources / compute. There are still absolutes in terms of pricing that are not acceptable/affordable by most.

ddxv 12 hours ago||||
Maybe I'm too cynical, but I've never trusted the worth $x of API tokens. It's like seeing an advertisement say $299 of value now for $19.99. It's not an actual number right? that $12,000 of "API Value" is just some made up marketing number isn't it?

I'm open to learning more, not trying to ask a rhetorical question.

rob 4 hours ago|||
Not everybody on HN works for a California startup and makes $500k a year. An extra $200 a month is a huge expense for a lot of people, especially those making < $100,000/year, which is a good portion probably.
andriy_koval 17 hours ago||||
> It might explain why DeepSeek Flash v4.1 1017 is the most popular model at OpenRouter.

by number of tokens? Also, we don't know numbers for native cli tools.

hbn 19 hours ago|||
You won't lose the house, everybody has three mortgages nowadays!
iammrpayments 2 hours ago||||
I’m happy with $20 plan. Almost never get limited and opus 5.5 can do almost everything I need.
mortalapeman 20 hours ago||||
What you need for real engineering and scaling is cheap and just enough smarts. I've found GPT 6 Luna to be cheap enough that I can pretend the cost doesn't exist and it's smart enough that I can get real work done. This let's me scale it in ways that I can't scale frontier models. And funny enough, the LLM I have running on my 5070 Ti is just about comparable to what I get from Luna. Unless frontier intelligence gets waaaaaay cheaper I basically don't care about them.
ChaseRensberger 20 hours ago||||
as long as anthropic requires me to use their trash UIs to use their amazing models, ill stick to other providers.
cyanydeez 20 hours ago||||
how much?
sick_of_slop 19 hours ago|||
[dead]
kimseungyong 14 hours ago||
The biggest relief is that the price has dropped by 20%. It’s still expensive, but with my $100 plan, Fable’s usage would spike instantly the moment I started using it, so it was always a source of fear. I will still use opus for general coding design, but for major designs.
FailMore 20 hours ago||
Here's a 20 page SmallDoc presentation on the most interesting aspects, including:

* Fable designed three electronic devices that worked after human assembly

* Fable solved two black-hole problems and Mythos predicted whole protein shells

* Fable controlled robots to unscrew a cap, solve a cube and draw

https://smalldocs.org/p/claude-fable-52-and-mythos-52-releas...

pacman1337 20 hours ago||
I can't understand why people continue using opus 5.5. Significantly more expensive than other models that produce exact same results (for coding results only)

If you are using Opus 5.5 I'm curious if it is because 1) your workflow is just stuck on it, 2) you don't care about money because you ain't paying it or 3 )do you think you get better results.

If you 3 please let me know your experience and how you actually measure it, or if you just feel it is better.

dilap 20 hours ago||
I haven't been able to run out of usage on the $100 plan with Opus 5.5. The model runs fast and gives me good results (I'm using it for coding). Prior to that I was on the OpenAI $200 plan; I jumped ship because I was burning through Astra usage in like 2 days.

I've played with some of the open models (GLM, DeepSeek Flash), but none of them have matched the results I get with Opus or Astra or (and a big jump down here) Sol.

Game_Ender 20 hours ago|||
What models should we be using? I have found it as good as Fable 5.1 for a lot of what I am doing at lower cost and decent speed. Where what I am doing it making reports, building small data pipelines, analyzing a large (millions of lines of code), code base.
or1gaminal 20 hours ago|||
subscription on claude code — usually inside the weekly limit. opus 5.5 for me felt better than any other model. not exactly on coding but rather it feels more pro-active. beside just doing a task it often provides insights besides the scope of the task but adjacent. like: look the llm provider apis have different priority queues. also it deals w/ vague instructions quite good and takes initiative. Astra in comparison is very autistic and follows instructions to the letter and rarely provide insights if not asked. Opus 5.5 is enjoyment to work with.
nater5000 17 hours ago|||
I've been a Claude Boi since December of 2025. A month or so ago, I decided to give ChatGPT a good go just to see how it properly compares. I've used a variety of models in a variety of contexts prior to this, but I figured with Astra out I had a good excuse to make it my "daily driver."

GPT is good. I actually really like Sol 6.1. It works fine. But I just switched back to Claude a few days ago and damn, Opus 5.5 is just better.

> 3) do you think you get better results.

It does. I really like to get my money's worth out of these things, so I'm constantly throwing stuff at these models while I have usage. The main things I've noticed is that Claude is much better at handling my more technical work "properly" compared to GPT. It has a certain "intuition" that makes a lot of sense to me; like someone with a lot of years of experience. Sol 6.1, on the other hand, is like someone who is very "booksmart" and knows how to do things in theory, but fails to grasp the "why" we do things often. You can really start to see how they diverge over long running, iterative tasks. Claude is just better at maintaining things as it goes. Sol starts to fall apart quickly if it didn't nail things on the first try.

> 2) you don't care about money because you ain't paying it

Despite being a very technical user, I have a hard time using up my usage. Maybe I'm not as hard-core a dev I thought I was, but if you're paying for more than just the $20 plan, I have hard time understanding what you're doing to have to really worry about usage.

cocoto 19 hours ago|||
I don’t even use half my Team Plan with Opus 5.5 high so I don’t care using a cheaper model. I’m not even limited by the speed of it (I’m compiler bound…).
zeroonetwothree 15 hours ago|||
It's the best model I've found for general coding and the $200 plan is enough for me to never run out of (sometimes if I do especially a lot I'll run out after about 5 days, but usually it's fine).
holbrad 16 hours ago|||
I can make it's usage fit inside my companies budgets and it produces noticeably better code that Sol 6.1 and needs less handloading because of that.

If the code doesn't matter and it's not that hard, Sol is fine and much cheaper.

jeremyjjj 17 hours ago|||
Better results than what? Opus 5? Then definitely.

But probably the answer to your question is subscription subsidization. With that, Opus 5.5 is SOTA and extremely cheap.

jcims 17 hours ago|||
other models that produce exact same results (for coding results only)

This is obviously not true. They are better or worse across many dimensions.

I don't have time to do a bunch of testing and optimization over which model to use for what task. I find Opus is the best that I regularly use so I stick with it until I have a task where I'm likely to spend more on it than I want to.

qingcharles 20 hours ago|||
Versus which models? Sonnet? Astra? Sol?
pacman1337 18 hours ago||
Varies, right now Argon 4 matches Sol / Opus and half price.
HDThoreaun 19 hours ago||
If youre on a sub claude and chatgpt cost pretty much the same as comparable open models
piter6917 7 hours ago||
I used Fable 5.1 today. It looks smooth.I look forward to Fable 5.2 to pick up my code loop holes.
gizmodo59 19 hours ago|
https://artificialanalysis.ai/#intelligence-efficiency-tabs this is the chart that matters for most of poor developers and companies. Pareto for a given intelligence index and looks like only openai is across the quadrant with muse at the bottom. They have really cooked efficient models!
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