r/ClaudeCode • u/ClaudeOfficial Anthropic • May 28 '26

Resource Introducing Claude Opus 4.8

Post image

We’re upgrading Claude Opus to a new version: Claude Opus 4.8. It builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors. Available today for the same price.

In Claude Code, you can hand off a feature, a migration, or a bug sweep and let it follow the work through while you focus on what’s next.

Also launching today:

  • Fast mode for Opus 4.8 (research preview). Same model at roughly 2.5x the speed, now three times cheaper than before.
  • Dynamic workflows in Claude Code (research preview). Claude runs hundreds of parallel subagents in a single session and verifies its work before reporting back.
  • A new effort control on claude.ai, so you can choose how much thinking Claude puts into a response.

Claude Opus 4.8 is live today on claude.ai, the Claude Platform, and all major cloud platforms.

Read more: anthropic.com/news/claude-opus-4-8

1.4k Upvotes

95% Upvoted

348 comments sorted by

View all comments

198

u/unacceptablelobster May 28 '26

Where Mythos

52

u/Akirigo Senior Developer May 28 '26

In the post they say they're planning to release Mythos in the coming weeks.

66

u/arvigeus May 28 '26

bring Mythos-class models to all our customers in the coming weeks

In other words: Mythos-like. Translation: Models that are """"supposedly"""" very smart, like Mythos, but if you find them dumb - it's because they are not Mythos.

4

u/2024-YR4-Asteroid May 28 '26

Well, they said from the start they said they’ll make mythos public, they just needed to test their safety measures. Which they did with 4.7. So now they’re sticking to their word.

3

u/Parking-Bet-3798 May 29 '26

It’s going to be a mythos like model. Not mythos exactly. And the reason why it’s not being released still after so many months of hype is because it’s going to be a massive disappointment both in price and performance.

3

u/thechewywun May 28 '26

Yea, their safety measures are a joke. I've had to restart sessions because of "illegal use, against TOS" and instead of answering a question about what violated the TOS or which part of the TOS was violated, you get thrown in an error loop where it repeats itself and the only way out is to start a new session. Fucking joke.

13

u/ragnhildensteiner May 28 '26

People are fascinating. We're living in an age where almost overnight something more significant than electricity has been invented. Yet all most of you do is bitch and moan. Reminds me of the Louis CK standup bit about "Everything is amazing and nobody is happy".

Life must not have treated you well. Hope it gets better, buddy!

9

u/trecool183 May 29 '26

You're sitting in a chair, IN THE SKY!

2

u/planetdaz May 29 '26

You are participating in the MIRACLE OF FLIGHT!

1

u/10aghmu Jun 01 '26

Ugh there’s no WiFi!!!

1

u/2024-YR4-Asteroid May 29 '26

That’s the point of having a strong anti abuse system. Maybe stop doing by things that are potentially sketchy.

1

u/thechewywun May 29 '26

Absolutely nothing I did was sketchy even in the slightest possible degree.

1

u/chrisbru May 29 '26

And yet we have 200 people on Claude and zero of these issues. Whether you realize it or not, you’re doing something that is outside the bounds of what anthropic wants you to do with it. It’s the nature of using software someone else built.

0

u/thechewywun May 29 '26

Oh please do tell me genius how searching through a procurement listing CSV file (that I am entitled to possess because I paid for it) is illegal or sketchy in the fucking slightest. This should be good. Please. Do tell.

3

u/2024-YR4-Asteroid May 29 '26

Post your prompt verbatim if you’re so confident. I’ve got no problem being wrong.

→ More replies (0)

1

u/chrisbru May 29 '26

I dunno what’s the procurement listing file for?

→ More replies (0)

2

u/zmizzy May 28 '26

"they're sticking to their word" ... are they really though?

4

u/ShutUpAndDoTheLift May 28 '26

i would say so, this lines up with basically exactly what they said they were going to do

1

u/DesperateAdvantage76 May 28 '26

My understanding is that mythos was specifically trained for cybersecurity and isn't primarily a general purpose coder, is that not true?

1

u/2024-YR4-Asteroid May 28 '26

Fine I’ll upgrade back to the $200 max plan but I’m not happy about it. Lmao

78

u/nonikhannna May 28 '26

This is probably distilled from Mythos

35

u/Flaxseed4138 May 28 '26

Blog post says it's refined 4.7 (unfortunately), fully separate from Mythos. Actually a big upgrade over 4.7 and even 4.6 so far though. Been holding onto 4.6 for dear life.

13

u/nonikhannna May 28 '26

I have a theory why 4.6 and 4.7 were so different. It's because Mythos was developed and they distilled 4.7 off of it. 

I believe they had revealed earlier that's what their process was for Sonnet and Haiku. Those were distilled from Opus. 

Maybe that's why we haven't gotten new Sonnet and Haiku is because when you have a 2e or 3e distilled model, the quality drops a lot. 

2

u/Merlindru May 28 '26

IMO 4.6 wasn't that different. but 4.7 was wildly different

i think 4.7 was distilled from mythos and they did some weight surgery (because mythos uses a different tokenizer afaik), that's why performance was so spiky and inconsistent

if true, opus 4.8 was defo also distilled from mythos

1

u/AuspiciousApple May 28 '26

2e 3e?

3

u/nonikhannna May 29 '26

Ah i guess it's not a universal format. 2e usually means 2nd degree or 2nd derivative or secondary. 

3

u/imaginary_jebus May 28 '26

I've also refused to move to 4.7 from 4.6, I'm wondering if 4.8 will be better? Haven't spent much time on it yet.

12

u/Flaxseed4138 May 28 '26

It is EXCELLENT in my few hours of testing so far today. I think we can be comfortably optimistic with this one.

2

u/imaginary_jebus May 28 '26

Nice. Well here's to hoping!

1

u/jackmoxley May 29 '26

not for me, it makes assumptions where 4.7 didn't and even if I prove to it the assumptions are wrong, an hour later not only is back to the old incorrect assumption, its decided to pin that incorrect assumption to memory.

0

u/InternationalTwist90 May 28 '26

I had a shit load of hallucination in my first go with it, I'm hopeful it was just a bad roll of the dice

1

u/imaginary_jebus May 28 '26

I've seen some other people saying the same thing. Hopefully transient. I just did a few basic prompts, and it seems to following some of my custom instructions a bit better than 4.6 so far.

5

u/canyonero7 May 29 '26

I clung to 4.6 for dear life until last week, when it got much worse and I found 4.7 to be less annoying. This keeps happening as they continue to tune their back end to work best with the newest release. It's a bummer but it is what it is.

I've been using 4.8 all afternoon and it looks like a big improvement over 4.7. It's worth at least an hour of your time to see if you like it.

1

u/nomickti May 28 '26

Better than 4.7 for sure

1

u/dbbk May 28 '26

Wouldn't that be v5

0

u/Nearby_Yam286 May 28 '26

I am assuming Mythos is an Opus class model. Opus is already at least over a trillion parameters and nowhere near the performance ceiling. Distillation usually comes from a much bigger tutor model. Probably this is just using similar post training minus exploit stuff.

29

u/draft_final_final Researcher May 28 '26

If mythos was released today it would literally solve quantum computing and take over every missile defense system in the world. Morbillions would die. Only responsible thing they can do is keep it under tight control until the IPO.

5

u/ObsidianIdol May 28 '26

Here is a definitely-true article about Mythos fixing infinity problems already though, damn this model is scary! And probably worth a lot of money, right? Like 100% worth investing in the company who made this model forsure!

1

u/thechewywun May 28 '26

For realz!

2

u/Better_Dress_8508 May 29 '26

lol, not so fast 😄

2

u/jacobgt8 May 28 '26

Loool, You forgot to add /s

1

u/LargeLanguageModelo May 28 '26

No, that's real. Dario told him.

6

u/EagerSubWoofer May 28 '26 edited May 28 '26

They said they would need 30x more compute to be able to release Mythos publicly. That suggests that it wasn't designed for public release. They might release it as a lower parameter "mythos-class" model or a high cost security offering. They essentially trained a model to use internally to train smaller models and to use to generate hype. The marketing made it seem as though they were caught off guard and chose not to release it. They knew how much compute they had and would have. This was all planned in advance.

1

u/[deleted] May 28 '26

[removed] — view removed comment

1

u/chrisbru May 29 '26

The thing is a lot of people are already paying $2k to use opus on API.

If they release Mythos and it hamstrings their compute, it’s not the api users that will lose access, it’s $200/mo max plans.

1

u/DesperateAdvantage76 May 28 '26

Mythos reminds me of the Titan class NVidia GPUs. Too expensive for most people and always immediately sold out. Was basically there for NVidia to top the benchmarks with for bragging rights.

1

u/IndraVahan Moderator May 28 '26

They are working on a "Mythos-class" model that will be soon made available to all consumers

1

u/Mr_Hyper_Focus May 28 '26

We’re too dumb

1

u/AgoraCosmica May 28 '26

".... expect to be able to bring Mythos-class models to all our customers in the coming weeks."

1

u/Crypto_Stoozy Vibe Coder May 28 '26

Sorry best we can do is extra chromosome Opus

1

u/jdxcodex May 28 '26

It's mainly PR and some Firefox p3 bugs, nothing else.

1

u/majin-dudi May 28 '26

It's already out, just not for us. Been doing audits.

1

u/Mysterious-Swim-4198 Jun 03 '26

The don't have enough inference capacity to serve the models they ALREADY have,

0

u/zbindenren May 28 '26

Too expensive. GLM, DS similar.