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Claude Fable 5.2 and Mythos 5.2

https://www.anthropic.com/claude-fable-and-mythos-5-2
139•meetpateltech•23m ago

Comments

217•19m ago
omg FINALLY lets GO
shmoil•19m ago
>> Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities we evaluated.

Was this before you lobotomized Opus 5.5 or after?

https://news.ycombinator.com/item?id=50419019

monkeydust•14m ago
Leaps across the board but Robotics jump is huge.
minimaxir•13m ago
There were more than a few "leaks" saying it would be called Fable 5.5, so I'm curious if a) the leaks were just engagementbait or b) Anthropic changed it, despite the fact that Fable 5.2 being better than Opus 5.5 is confusing.

Surprisingly the model is available immediately in my Claude Code: usually there's a delay, either for rollout or safety.

BorisMelnik•8m ago
I'm a bit out of the loop - would the engagement bait be becuase it is 3 minor jumps forward?
bananaflag•3m ago
Probably they have a more impressive model in preparation, and they're gonna dub that Fable 5.5.
iammrpayments•13m ago
Too expensive for me
hmate9•13m ago
Its cheaper at $8 per million input tokens and $40 per million output tokens which is also pretty sweet.
minimaxir•6m ago
Additionally, the terms for the free resets are unusually generous: https://support.claude.com/en/articles/17506494-claude-fable...

> the number of Fable resets you get depends on how long you’ve been a paid subscriber [...] Subscription length is measured from the date of your first paid bill. If you canceled and came back, the time since your first paid bill still counts.

> These resets expire on March 8, 2027 at 11:59 pm PT.

tl;dr if you joined when Opus 4.5 became a thing, you got 2 resets.

guybedo•2m ago
i might be wrong here but it seems these are not resets of your weekly quota but resets of the Fable limit.

That means you can lift your Fable max 50% usage and you'll just end up burning through your quota faster. You won't have more tokens.

__natty__•13m ago
Maybe it's just me, but I found Claude's writing style terrible compared to GPT or Gemini. It's "smart", but the way it communicates seems somehow off compared to other models.
ealready_value•11m ago
Very interesting that they set the flagship's version number to 5.2, but their penultimate model is 5.5. Do they want people to to continue to think that Opus is based on more advanced technology? The decision these AI companies make continues to baffle me.
iamdelirium•10m ago
FrontierCode 2.0 is such a poor benchmark for Gemini since it's the only model forced to not use its own harness but Devin CLI.

I wonder why that team singles Gemini out like that.

aurareturn•9m ago
Is this the Model 4 internal name?

Reference: https://x.com/METR_Evals/status/2118412205662314935

tiffanyh•8m ago
I didn't realize that Opus 5.5 was more capable than Fable 5.1 in virtually every category.
cobri•6m ago
Does this coincide with the claimed nerfing of Opus 5.5? https://news.ycombinator.com/item?id=50422069
jasonlotito•4m ago
At this point, this is giving "She Deep Breaths More" from Onyxia in WoW.
pookieinc•5m ago
“Testers have found that Fable 5.2 and Mythos 5.2 communicate more clearly than past Fable and Mythos models. They generate outputs up to 30% faster than Claude Fable 5.1 and Claude Mythos 5.1, and they’re available at a lower price: $8 per million input tokens and $40 per million output tokens.”

Honestly incredible that they’ve managed to beat all benchmarks, while making it cheaper. Always happy to see improvements offered at lower costs.

Will be interesting to see what OpenAI does in response

privacyishuman•4m ago
They still need a response to Opus 5.5
canadiantim•5m ago
god bless token resets!
hello5010•3m ago
> god bless token resets!

You have session limits?

You should probably give OpenCode a try. Can run DeepSeek, Qwen, Kimi, … but also Fable 5.2, Opus 5.5 and GPT 6 Astra

theverycob•5m ago
+ 2 Fable resets HAHA. "Too expensive" who cares! Thanks Dario
awongh•5m ago
Doubling Remote Labor Index (RLI) - at 41.3% compared to around 20% for the other models - I wonder what kinds of new agentic work this is going to unlock.
bananaflag•5m ago
Those theoretical physics papers look like the real thing (i.e. not mathematical physics like the OpenAI Yang-Mills result). It looks like AI is finally branching out of math.
unshavedyak•4m ago
Looks like some plans get extra fable usage: https://support.claude.com/en/articles/17506494-claude-fable...
theverycob•4m ago
+2 Fable resets!!! "Too expensive" Who cares! Thanks Dario
artisin•4m ago
We'll see what my bank account has to say about this:

> Fable 5.2 at High effort scored about level with Opus 5.5 at Max effort, for roughly half the cost per task

mikert89•4m ago
The end of software is so close, very soon the code itself will be nearly obsolete, there will be schedulers, queues, a database, and the model
skeledrew•3m ago
Damn people were right about 5.5 being nerfed in preparation for a version release. This is not at all a good look.

- https://news.ycombinator.com/item?id=50422069

fermlon30000•3m ago
stop OPUS 5.5 FUCK, DAMMIT, THEY DIDN’T JUST NERF HIM—THEY ABSOLUTELY OBLITERATED HIM, THE FUCKING MISANTHROPES! I EVEN MADE A MISTAKE IN MY ENGLISH IN THE PREVIOUS SENTENCE—NOW THAT FUCKING CLAUDE IS TEACHING ME ABOUT BUGS!
butler14•2m ago
Just read the other thread about opus being nerfed and thought "cue the new release"... paha

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https://www.anthropic.com/claude-fable-and-mythos-5-2
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134•datareceipts•3h ago•77 comments