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Posted by alvis 20 hours ago

Claude Opus 5(www.anthropic.com)
https://www.anthropic.com/claude-opus-5-system-card
1630 points | 980 commentspage 18
emunova 19 hours ago|
[dead]
CurbStomper 13 hours ago||
[dead]
Nevin1901 20 hours ago||
Excited to use it? Will we be seeing Haiku 5 next? /s
midnightbobarun 17 hours ago|
I unironically hope Haiku gets an update considering it came out in October of last year and it seems like Anthropic just kind of forgot about it.
datakan 20 hours ago||
> Claude Opus 5 is not more capable overall than our most capable general-access model, Claude Fable 5

Ok then so what's the point?

vidarh 20 hours ago||
Fable is twice the price.
varispeed 20 hours ago||
If Fable gets correct answer quicker, then you might pay less than doing back and forth with Opus, plus you lose more of your own time.

I see no reason for using less able models in my workflows. There is this saying, penny wise and pound foolish

vidarh 13 hours ago|||
If doing a lot of heavy lifting there. Not only is it not a given that they'll get the correct answer for a lot of simpler tasks in fewer tokens, but smaller models are often available at far higher tokens/second inference.

There are certainly tasks where fable will be faster and/or cheaper, but there are plenty of tasks where even Haiku is as fast or faster and cheaper, or where you can e.g. get away with models like gpt-oss that you can get from inference providers providing 10x+ the token/second speed.

If you don't use enough tokens that relying only on Fable becomes a problem, then keep using just Fable. Personally, for my $200/week Max subscription I'd run out of the weekly quota for Fable in a day. At API pricing I'd go bankrupt if I tried doing the things I do with cheaper models using Fable.

SubiculumCode 20 hours ago||||
same as it ever was. It seems your argument implies a belief that you should always use the best model. Others think that not all tasks require the absolute most powerful, expensive, model.
sambaumann 20 hours ago||||
The CursorBench plot, for example, shows that fable does have slightly better performance, but Opus is pretty close, and is less expensive per task
stuartjohnson12 20 hours ago||||
fable on longer coding tasks with fable subagents will easily chew through hundreds of dollars in a single run.
signalchain 16 hours ago||
[flagged]
8note 20 hours ago|||
less expensive per task might also mean less of your own time
albert_e 20 hours ago|||
Fable 5 is NOT included in Claude Pro subscription
tamimio 20 hours ago|||
Aren’t they planning to remove it even from max and keep it only credit based? OpenAI will be happy if that would happen
javawizard 20 hours ago|||
Really? It's better than Opus 4.8, that's the point.

When they release new versions of Sonnet, no-one expects them to be better than Opus.

serf 20 hours ago|||
it's nice to know how to work the thing that fable fails down to when it dislikes your prompt.
Infinity315 20 hours ago|||
This is useful to me since I delegate most coding tasks to Opus and use Fable for planning.
afavour 20 hours ago|||
The cost?
merb 20 hours ago||
Same as 4.8
cmrdporcupine 20 hours ago|||
To have an answer to "Sol" GPT 5.6 which is far more cost effective and available than Fable.
occz 20 hours ago|||
Pricing, presumably
viccis 20 hours ago|||
This is confusing to me because in their blogpost they show model benchmarks and it spanks Fable pretty soundly in most tests.
danielbln 20 hours ago|||
Cost.
LeoPanthera 20 hours ago|||
Presumably, it’s cheaper.
simianwords 20 hours ago|||
You are being downvoted for a fair question and others are extremely wrong and confident.

The point is that Opus 5 is the best they can do without needing classifiers and absurdly broad safeguards.

pferde 20 hours ago||
The illusion of progress and advancement, to appease shareholders, and slightly postpone the looming bubble pop.
CaptWorld 20 hours ago||
Why are we still talking like ai is majorly used for increasing shareholder value only? Its coding performance is top notch and quality is increasing at a rapid pace. It wasn't even half this good a year back. It even is useful for a subset of math problems.
zormino 20 hours ago||
People don't seem to be able to reconcile the fact that there is likely an overbuild and overspend on AI that may be inflating a bubble, and that AI is actually incredibly useful and getting really really good for certain tasks. Both camps are right, except for when they say the other is wrong.
stri8ted 19 hours ago||
By what measure is there an overbuild? Every metric I look at, shows inference unable to satisfy current demands.
permalac 6 hours ago||
I know companies paying for AI and not training people to use it, so spending is higher than usage on those.
aleenz1102 20 hours ago||
this claude fable & opus 5 should be cheaper and can compete in pricing with chatgpt latest models
TheJCDenton 19 hours ago||
I think it's the first time Anthropic release a model without any meaningful disruptions while doing it
LoganDark 19 hours ago|
Have to wait 7 days to see if they receive a surprise order.
midnightbobarun 20 hours ago|
It looks great, and those coding benchmarks are impressive... now if only it didn't come out just days after I let my Claude subscription expire :')
nezhar 3 hours ago||
It's always like this, that's probably why they are pushing new models every few weeks.
Footprint0521 18 hours ago||
Long live K3 lol