Mythos. Dario.
I can feel his breath on my neck, it’s a mix of dog food and excitement.
It’s close.
5:16 PM · Jun 8, 2026 · 27.6K Views
Anthropic tests unreleased Claude Fable 5 and Mythos 5 checkpoints
The rollout follows weekend leaks of the model's checkpoints.
2413.3K106198303.8K
Sentiment
Positive users express excitement about the Claude Fable 5 Mythos model launch due to its quality, while negative users dismiss it as unremarkable and criticize the focus on flagships over fast cheap options.
Pos
58.6%
Neg
41.4%
59 comments with sentiment.
Cluster Engagement
Posts from X
Most Activity
Most Activity
VIEWS119.2KBOOKMARKS89LIKES1KREPLIES88
Chubby♨️@kimmonismus
Claude Mythos will be released today (June 9th), according to leaks everywhere.
The interesting question is whether they'll also update Sonnet or Haiku.
Not that Mythos isn't enough for me, I'm just curious why the smaller models are currently getting so little attention.
Anyway, it will probably be called Claude-5-fable.
1dViews 119.2KLikes 1KBookmarks 89
RETWEETS109
Claude@claudeai
Fable 5 is state-of-the-art on nearly all tested benchmarks, with exceptional performance in software engineering, knowledge work, scientific research, and vision.
The longer and more complex the task, the larger Fable 5’s lead over our other models.
1dViews 31KLikes 959Bookmarks 68
Lisan al Gaib@scaling01
claude-fable-5 👀
1dViews 74.6KLikes 641Bookmarks 47
Claude@claudeai
Releasing a model this capable comes with risks. Without safeguards, Fable 5’s capabilities in areas like cybersecurity could be misused to cause serious damage.
Queries on a narrow range of topics will instead receive a response from our next-most-capable model, Opus 4.8.
1dViews 18.9KLikes 400Bookmarks 29
Yuchen Jin@Yuchenj_UW
Claude Fable 5 (Mythos) is finally out!
This is what I was looking for!!!!!!!!!!!!!!!!!!!!
1dViews 17KLikes 312Bookmarks 11
🍓🍓🍓@iruletheworldmo
1dViews 23.8KLikes 350Bookmarks 7
Lisan al Gaib@scaling01
Claude Fable 5 is out
1dViews 9.9KLikes 273Bookmarks 9
Claude@claudeai
Claude Fable 5 is available everywhere today. Claude Mythos 5 is restricted to Glasswing partners until we expand our trusted access program.
https://www.anthropic.com/news/claude-fable-5-mythos-5
1dViews 15.7KLikes 190Bookmarks 9
Lisan al Gaib@scaling01
I'm so excited to sell some feet pics to the highest bidder
Lisan al Gaib@scaling01
claude-fable-5 👀
1dViews 10.3KLikes 182Bookmarks 12
Claude@claudeai
For a small group of cyber defenders and critical infrastructure providers, we are also launching Claude Mythos 5.
Mythos 5 shares the same underlying model as Fable 5, but with the safeguards lifted in some areas.
1dViews 11.3KLikes 147Bookmarks 5
Claude@claudeai
Fable 5’s safeguards detect requests related to cybersecurity, biology and chemistry, and distillation. Users are informed whenever a fallback occurs—on average in less than 5% of sessions.
We’ll keep refining the safeguards to reduce false positives.
1dViews 12.4KLikes 157Bookmarks 4
Lisan al Gaib@scaling01
Claude@claudeai
Soon, we intend to expand access to Mythos 5 through a broader trusted access program, both for defensive cybersecurity work and biomedical research.
1dViews 16.7KLikes 159Bookmarks 1
Jimmy Apples 🍎/acc@apples_jimmy
Apparently tomorrow 🤷♂️
7 hours ago
Jimmy Apples 🍎/acc@apples_jimmy
Mythos. Dario.
I can feel his breath on my neck, it’s a mix of dog food and excitement.
It’s close.
1dViews 8.3KLikes 56Bookmarks 2
Leon Lin@LexnLin
@claudeai feels like
1dViews 3KLikes 77Bookmarks 2
Lisan al Gaib@scaling01
"dad, how much did mythos actually cost?"
Lisan al Gaib@scaling01
"dad, what did mythos cost?"
1dViews 3.9KLikes 38Bookmarks 0
Hermes Agent Tips@HermesAgentTips
@claudeai its cooking time boysssssssss
1dViews 2.3KLikes 29Bookmarks 1
chalish@chalish_b
@scaling01 he knew
1dViews 1.3KLikes 16Bookmarks 1
Alex Albert@alexalbert__
@claudeai Very excited for folks to try this one out!
1dViews 650Likes 17
Dan Shipper 📧@danshipper
@claudeai A BEAST of a model.
here's our vibe check from a week of testing:
1dViews 987Likes 14Bookmarks 1
Load more posts