Original post
Zephyr#1561
Zephyr#1561
Jukan@jukan05
SOURCES: ANTHROPIC WILL RELEASE THE PUBLIC VERSION OF MYTHOS TOMORROW
7:18 PM · Jun 8, 2026 · 840.8K Views
Anthropic launches Claude Fable, a Mythos-class model that scored 91 on Every's senior-engineer benchmark
AI Judge changed title after evaluation, original title: "Anthropic to launch Claude Fable, a Mythos-class model optimized for agent workflows at double the price of Opus"
Story Overview
Unverified social chatter points to Anthropic dropping its first Claude 5-class model tomorrow under the public name Claude Fable, moving the Mythos tech that has so far stayed behind Project Glasswing gates into broader reach with added safety layers.
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Safety Shift
Guardrails get stronger for everyone
Reports describe the public version carrying heavier safety restrictions and trimmed cyber capabilities compared with the partner-only release, which could change how developers test frontier features.
Open Question
Long-context claims stay unconfirmed
The rumored performance bump on extended tasks matches the model’s earlier positioning yet rests entirely on anonymous posts, with no official benchmarks or Anthropic statement available yet.
Sentiment
Positive users praise Anthropic's new Claude Fable 5 model and its biosafety safeguards as an exciting step into a smarter AI era, while negative users object to the premium pricing and restrictive limits that reduce its usefulness.
Pos
48.7%
Neg
51.3%
593 comments with sentiment.
Cluster Engagement
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VIEWS1.2MREPLIES231
MTS@MTSlive
SITUATION DETECTED: Anthropic to release Mythos tomorrow, per Sources.
1dViews 1.2MLikes 6.9KBookmarks 676
BOOKMARKS1.5K
Felix Rieseberg@felixrieseberg
Today, we're introducing Claude Fable 5 and Mythos 5, two configurations of our next major language model.
I'd normally highlight the numbers: It's SOTA on nearly all benchmarks. I want to talk about something else, because with Fable 5 out in the world, I think a third era quietly started today.
I lead Claude Code & Cowork on the desktop, so I think a lot about how people use AI to get work done. I believe we're about to see a major shift, moving from giving AI tasks to giving it responsibilities.
1dViews 739.5KLikes 5.8KBookmarks 1.5K
LIKES7.4KRETWEETS405
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.
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 1.1MLikes 7.4KBookmarks 1.1K
techniacus@Techniacus
I'm so ready
Chubby♨️@kimmonismus
Confirmed, Claude Mythos will be unveiled in the next few hours
1dViews 211.2KLikes 6.7KBookmarks 285
Alex Albert@alexalbert__
I've been at Anthropic through every model launch. There's been a few cases I can remember of a launch that stands out and marks a step-change in how we use models: - Claude Opus 3 - Claude Sonnet 3.5 - Claude Opus 4.5
And now Claude Fable 5.
With Fable, the model stopped feeling like a tool I direct and started feeling more like something I collaborate with.
Claude@claudeai
Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.
Its capabilities exceed those of any model we’ve ever made generally available.
1dViews 593.4KLikes 3.2KBookmarks 585
Chubby♨️@kimmonismus
Confirmed, Claude Mythos will be unveiled in the next few hours
Stephanie Palazzolo@steph_palazzolo
Scoop: A neutered version of Mythos called Claude Fable is coming today. It's expensive—2x the price of Opus—but perhaps not as pricey as people might have thought from the initial Mythos pricing (5x Opus).
More on that and Apple WWDC in AI Agenda:
https://www.theinformation.com/newsletters/ai-agenda/anthropics-mythos-coming-today-apple-pursues-modest-goals-siri-revamp
1dViews 323.8KLikes 1.2KBookmarks 116
Andrew Curran@AndrewCurran_
Alex Heath says Anthropic is planning to release the public version of Mythos tomorrow, June 9th.
1dViews 134.8KLikes 895Bookmarks 113
Chubby♨️@kimmonismus
Claude Mythos is conning tomorrow!!
Prepare yourself friends. It’s happening!!
1dViews 83.3KLikes 926Bookmarks 63
Gary Marcus@GaryMarcus
Claude Mythos went from “too dangerous to release” to publicly available (with some extra guard rails) in two months.
And y’all fell for Anthropic’s whole routine.
Again.
🤦♂️
1dViews 24.3KLikes 788Bookmarks 56
Lisan al Gaib@scaling01
Claude Mythos (Fable) Pricing: $10 / input MTok $50 / output MTok
according to The Information
Stephanie Palazzolo@steph_palazzolo
Scoop: A neutered version of Mythos called Claude Fable is coming today. It's expensive—2x the price of Opus—but perhaps not as pricey as people might have thought from the initial Mythos pricing (5x Opus).
More on that and Apple WWDC in AI Agenda:
https://www.theinformation.com/newsletters/ai-agenda/anthropics-mythos-coming-today-apple-pursues-modest-goals-siri-revamp
1dViews 158.4KLikes 557Bookmarks 62
Delip Rao e/σ@deliprao
announce "too dangerous to release" --> get media buzz
announce "working with select partners" --> get media buzz
announce "releasing model" --> get media buzz
stagger the announcements so the press momentum is unbroken before the IPO. The strategy is to salami slice your one-event to create an illusion of multiple events and manufacture a narrative. If you study Bernays, you understand everything about this company.
1dViews 51KLikes 373Bookmarks 72
Andrew Curran@AndrewCurran_
Good morning. We should be getting the new Anthropic model today: Claude Fable. The public version of Mythos. A week earlier than when I thought it would be, but it's not actually here yet, so let's see. I will make a non-Fable news thread if we get the usual release day storm.
1dViews 64.3KLikes 601Bookmarks 32
Trung Phan@TrungTPhan
Sarah Connor seeing Anthropic rename “Claude Mythos” to “Claude Fable” and releasing it to the public
Claude@claudeai
Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.
Its capabilities exceed those of any model we’ve ever made generally available.
1dViews 98.5KLikes 409Bookmarks 52
Gavin Baker@GavinSBaker
Evidently prices will go up in about two weeks.
Also I preferred Mythos to Fable.
Fable makes me think of fabulist, which is not the best association.
Excited to try it!
1dViews 68.6KLikes 472Bookmarks 42
🍓🍓🍓@iruletheworldmo
there’s absolutely 0 chance mythos drops today.
there’s also no chance you’re getting 5.6 this week.
and mythos is not a gigantic upgrade on current sota.
1dViews 49.9KLikes 343Bookmarks 23
Chubby♨️@kimmonismus
"Fable 5 requires usage credits. Update Claude Code to the latest version to learn more."
1dViews 47.9KLikes 408Bookmarks 43
Felix Rieseberg@felixrieseberg
With Fable 5, I've personally moved on to responsibilities or "loops".
I no longer tell Claude to investigate a particular crash report. It runs in a loop, watching every crash report that comes in. Its job is no longer to help me fix a crash, it's to keep our apps from crashing.
1dViews 28.8KLikes 330Bookmarks 60
Brandon Gell@bran_don_gell
We've had access to Anthropic's Fable 5 for a week.
At Every, it's our job to work on the edge of AI which means getting access to and testing our workflows and use cases on new models that drop.
This past week we went hard to figure out Fable 5 fairs.
Surprise... it's the best coding model in the world. Checkout the full vibe check here: https://every.to/vibe-check/anthropic-mythos-our-fable-vibe-check
Dan Shipper 📧@danshipper
BREAKING:
Anthropic just dropped Claude Fable 5—this is Mythos, made safe for public release. It is the best coding model in the world.
We've been testing it internally @every for the last week or so across coding, writing, marketing, editing, and more—here's our vibe check:
- It broke our benchmarks. Fable scored a 91/100 on our Senior Engineer benchmark—this is human senior engineer level. The previous high score was Opus 4.8 at 63. GPT-5.5 is a 62.
- It's a one-shot wonder. You can set it and forget for hours or overnight on huge coding tasks, and come back to completed work. It cleared entire production bug backlogs, built a playable 3D, and even made a 2-minute animated film—all one-shot.
- Taste and attention to detail. In coding and knowledge work tasks, it has much better taste and attention to detail than we've ever seen. It gets subtle things right, adds little features you might not have thought of, and generally understands the assignment in ways that surprised us.
- Great use of context. We set it loose analyzing customer feedback surveys and our website data and it came back with a crisp, clean report that identified a. our biggest problem and b. a concrete testable solution—and then we sent it off to build that.
- It's best for power users. If you're already used to orchestrating multiple agents in your work, this model can do things that you've never seen before. If you're a knowledge worker or vibe coder with a more basic setup, you're not going to notice a huge difference—in fact, it probably isn't the right model for you.
- It's very slow, token-hungry. Using this thing for regular knowledge work is like squashing an ant with a rocket launcher. It also routinely uses 500k to 1M tokens on tasks. That's why it's best for your heaviest jobs—but not as good for tasks like collaborative writing. - It's expensive. It's about twice as expensive as Opus, and it's also incredibly token hungry—so expect it to be something you'll use sparingly unless your company pays for it.
Overall, I think of it like a warp drive for coding: It can get you across the galaxy in a few hours, when it used to take months or years. But it's not appropriate for getting around town—you need something faster, cheaper, and more maneuverable.
The ceiling is extraordinarily high on this model though. Even our most advanced testers like @kieranklaassen felt like they were only scratching the surface of it.
Want our full vibe check with all of our testing and benchmarks? Read it on @every: https://every.to/vibe-check/anthropic-mythos-our-fable-vibe-check
1dViews 48.6KLikes 110Bookmarks 83
Dan Shipper 📧@danshipper
FABLE (MYTHOS) is OUT!
we've been testing for a week @every. here's our vibe check:
Felix Rieseberg@felixrieseberg
Today, we're introducing Claude Fable 5 and Mythos 5, two configurations of our next major language model.
I'd normally highlight the numbers: It's SOTA on nearly all benchmarks. I want to talk about something else, because with Fable 5 out in the world, I think a third era quietly started today.
I lead Claude Code & Cowork on the desktop, so I think a lot about how people use AI to get work done. I believe we're about to see a major shift, moving from giving AI tasks to giving it responsibilities.
1dViews 15.9KLikes 122Bookmarks 67
Andrew Curran@AndrewCurran_
Claude 5 Fable is live for me right now.
Andrew Curran@AndrewCurran_
Good morning. We should be getting the new Anthropic model today: Claude Fable. The public version of Mythos. A week earlier than when I thought it would be, but it's not actually here yet, so let's see. I will make a non-Fable news thread if we get the usual release day storm.
1dViews 23.5KLikes 358Bookmarks 26
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