/AI4h ago

New Claude Mythos 5 Model Slug Spotted in Anthropic Dev Mode

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Original postSuper Dario#1794

BREAKING 🔥: A new Claude Mythos 5 model slug has been spotted via Dev Mode.

Claude Mythos is planned to be released as its own model class, besides Haiku, Sonnet and Opus model families.

Soon? 👀

5:19 AM · Jun 6, 2026 · 91.3K Views
Sentiment

Positive users are hyped about Anthropic's new Claude Mythos model class and Mythos 5 slug for its dedicated upgrade potential, while negative users regret subscriptions and complain about vague timelines plus slow current models.

Pos
76.9%
Neg
23.1%
26 comments with sentiment.
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Gregor Amon@ai_with_gregor

@testingcatalog Considering they haven’t updated haiku in forever I think sonnet will be the new lowest IQ model, and haiku the best with opus in the middle

4hViews 1.9KLikes 11Bookmarks 1
BOOKMARKS1

@ai_with_gregor We may see a new Haiku at some point too as it is powering their voice mode afaik

4hViews 1.6KLikes 15Bookmarks 1
LIKES16
vittorio@IterIntellectus

@testingcatalog HERE WE GO

3hViews 860Likes 16
RETWEETS1
Based Elnen@based_elnen

@testingcatalog Mythos is coming 🔥

Positioned in @mythosrouter

4hViews 333Likes 9
REPLIES2

@SahilPanhotra @testingcatalog Mythos is just Anthropic's "GPT Pro" class (it never offered a public model that was as powerful as GPT Pro).

And the price discrepancy will be similar:

1hViews 30Likes 1
Anton P. 👽@antonpme

@testingcatalog Mythos 5 = Opus 5, and the current Opus models (since 4.7) are nothing but a new generation of Sonnet models.

4hViews 1.2KLikes 11
sileod@dmnsl1

@testingcatalog I just noticed that Mythos actually made sense in the Haiku/Sonnet/Opus/Mythos logical progression ("Mythos is a worldview-based traditional story or body of mythology")

3hViews 695Likes 2

@SahilPanhotra @testingcatalog Why would it mean that the Opus family is dead?

That's like saying "GPT 5.5 Pro exists. Does this mean that GPT 5.5 Extra High is dead?"

2hViews 36Likes 2

@SahilPanhotra @testingcatalog Did you pay attention to the comparison?

Mythos will be a very large expensive model, like GPT Pro is. You will not be able to afford it for most things you do. Opus will be the most expensive model family you will run for most things.

1hViews 28Likes 2
Luci Pars@parsluci

@testingcatalog We know it will be beautiful but expensive :/

4hViews 791Likes 3
Harshith@HarshithLucky3

@testingcatalog it will be back soon...

4hViews 304Likes 3
Pratik Patel@PratikPatel_227

@testingcatalog @grok verify

3hViews 93

@someRandomDev5 @testingcatalog thanks for pointing that out

what i mean by dead was opus family ends at opus 4.8

now the newer family is mythos 5 and ahead

for better improved models

1hViews 16Likes 1

@testingcatalog it directly starts from claude mythos 5 ?

like seriously 5 ?

does that mean opus family is dead?

2hViews 354Likes 2

@testingcatalog Let's gooo, what's your prediction guys, next week or?

4hViews 302Likes 2
Sqersters@Sqersters_

@testingcatalog seen it since 1h+

4hViews 317Likes 1
JustForFUNFUNFUN@JFunfunfun

@testingcatalog haiku and sonnet are depreciated?

4hViews 270Likes 1
Rand@rand_longevity

@testingcatalog mythos has entered the chat!

2hViews 83Likes 2
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