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Posted by alvis 9 hours ago

Claude Opus 5(www.anthropic.com)
https://www.anthropic.com/claude-opus-5-system-card
1273 points | 694 commentspage 7
guess_who_is 5 hours ago|
I have started distilling
vinhnx 8 hours ago||
For anyone wanting a faster overview, I used NotebookLM to create a brief video summary after going through the system card and announcement blog using a cinematic video overview. Link: https://www.youtube.com/watch?v=SUFBhvQ2tY4. And a podcast companion: https://www.youtube.com/watch?v=nYZTW2snXow
pietz 6 hours ago||
I think content like this will be the next big challenge. Because it isn't obvious "slop". The voice sounds good, graphics look alright, animations work. People could watch this and feel like some serious time was invested making it.

But good god, what a steaming pile of bullshit this is. Completely exaggerated and overly technical language over 235 seconds that could have been explained in 30 to a 12 year old.

Trash content doesn't normally frustrate me, because it's usually quite easy to spot trash. But in the time of AI, trash can actually look good at first glance and it needs some actual knowledge to spot its problems.

Sorry for the harsh words, but for the love of humanity stop producing content or do it better.

vinhnx 3 hours ago||
Fair criticism, I understand your finding. It's not everyone's taste, when it from AI-generated contents.
cheema33 5 hours ago||
Cinematic video link is incorrect. Podcast link is correct.
vinhnx 3 hours ago||
Thank you, I have had updated the video link here

Video Special | Anthropic's Claude Opus 5 + https://www.youtube.com/watch?v=8Vdofv2vQ_M + https://www.youtube.com/watch?v=q-jHHx3J8m8

rad_val 7 hours ago||
After Opus 4.8 intelligence really started to matter less and less for the programming tasks I have. If I have to handheld anyway, why would I wait more or pay more?
CuriouslyC 7 hours ago|
The next frontier is taste, style and thoughtful organization. If all frontier models can solve a problem, the winner is the one that can solve it in the most clear, concise, durable way.
destring 9 hours ago||
Google is having their Meta moment where they failed to stay at the frontier
skybrian 8 hours ago||
Looks like the API price in tokens is same as previous Opus or Sol, double the price of Terra.

Maybe there’s a better comparison than cost per token, but it will be application-specific.

skerit 8 hours ago||
Interesting, they finally support `system` messages anywhere in a chat conversation:

> Mid-conversation system messages are available on the Claude API, Claude in Amazon Bedrock, and Google Cloud. > > This feature is available on Claude Fable 5, Claude Mythos 5, Claude Opus 4.8, and Claude Opus 5. No beta header is required. This feature is not available on Claude Sonnet 5; use the top-level system field instead.

For nearly all models EXCEPT Sonnet 5? That is weird. How old is Sonnet 5 really?

beydogan 7 hours ago||
my early and non scientific feeling:

- it has this annoying Opus response style(since Opus 4.7) with bunch of very hard to interpret word salad

- on >xhigh it eats tokens like there is no tomorrow

I don't like it. Since Fable is unaffordable for anything meaningful, I'll stick with Sol for now. I was on Max 5x, saying hi to Fable costs %5 weekly.

jatins 9 hours ago||
Better than Fable 5 on all but 3 evals.

Has Anthropic ever mentioned how do Opus and Fable differ? It used to be Haiku < Sonnet < Opus in terms of params. Where does Fable fit in this?

helloplanets 6 hours ago||
Pretty sure Mythos and Fable have way more params, but they've just been able to use the synthetic data off of them to get the leap in quality from Opus.

So, not a distilled version of Mythos or Fable, but those models likely helped a lot in the post training phase of Opus.

jatins 11 minutes ago||
> they've just been able to use the synthetic data off of them to get the leap in quality from Opus.

> not a distilled version of Mythos or Fable

isnt distilled == trained on synthetic data and reasoning traces?

CaveTech 9 hours ago||
Haiku < Sonnet < Opus < Fable
dehugger 9 hours ago||
Is Fable 5 just Opus 5 with some additional long-context management modifications for extended self-directed work? Or are they actually truly different models?
andrewl-hn 8 hours ago||
I suspect they make a big model first. In this case it's Fable. Then they run the shrinker steps to make Sonnet and Opus. Sonnet is smaller, takes less time to make, so it got released first. Opus needed few more weeks to cook.

With this iteration they had a delay because when the Mythos was ready they had some sort of "Oh shit" moment and spent half a year adding safety guards to it. Then slowly rolled it out, but got another delay due to a government block. So, maybe the work on making Opus and Sonnet only started after they got a green light from the administration.

Presumably, now that they learned how to do this safety-wrapping the next iteration of Mythos / Fable / Opus / Sonnet is going to show up faster.

Something like that.

Wowfunhappy 8 hours ago||
But I wonder how they were able to release Sonnet 5 during the period when even people inside Anthropic were legally barred from using Mythos/Fable?
anon373839 3 hours ago|||
There is word on the street that they allowed employees to work with a slightly stronger internal version of Mythos (5.1, if you will) that, in their parsing of the order, wasn’t restricted. If true, in practical terms, they ignored the order.
riknos314 8 hours ago|||
Iirc the ban only applied to non-Americans. While anthropic found collecting citizenship information on all customers too burdensome, it's a much smaller lift to collect such info for your own employees.

So I'm assuming at least a subset of employees could continue using the models during that time.

Wowfunhappy 7 hours ago||
Although the ban was only for non-Americans, Anthropic said that they'd also restricted access to their own employees internally, because they had no other realistic way to apply the government's orders. I guess it's possible they were lying, but seems unlikely.
tedsanders 7 hours ago|||
No, they're different models. Knowledge cutoff has been updated.
oh_no 8 hours ago||
based on pricing I think it's safe to say they're different. why would they charge half price when fable has been very popular?
somenameforme 7 hours ago||
They just got a huge amount of customer price info over the past few days after they went token only for Fable. I suspect the conversion rate was extremely low, with consumers far less sticky than they might have hoped. In my case I was planning on swapping, probably to a Chinese model, when my sub expired this month, but the release of Opus 5 is probably enough to keep me paying rent until the next open model/closed model face-off in a couple of months.
6thbit 8 hours ago|
"although Opus 5 shows improvements in its ability to identify software vulnerabilities, it is substantially behind Mythos 5 in its ability to exploit them."

"Opus 5’s safeguards match those of Claude Fable 5’s, with one change: it now permits source-code vulnerability discovery at all access levels".

This is probably great news, but then again, where does this leave Fable as a choice?

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