Discussion

• @deredleritt3r Prinz on x

  Anthropic has been testing a new model called “Mythos” with certain customers: - a “step change” in AI capabilities, including “dramatically higher scores” in coding, academic reasoning and cybersecurity - “currently far ahead of any other AI model in cyber capabilities” - [image…

• @andrewcurran_ Andrew Curran on x

  Mythos is a new tier, bigger than Opus, and more capable.  It will be beyond the current state of the art by a wide margin, a dramatic jump in intelligence.  Things have been accelerating under the surface since December.  Capabilities are increasing faster, the time between mode…

• @emollick Ethan Mollick on x

  I know these are all unreliable leaks of internal code names but please, please AI labs, the only thing worse than calling your models GPT-5.5-xhigh-Codex-nano is giving them names like Agent Smith or Mythos, for obvious reasons. [image]

• @peterwildeford Peter Wildeford on x

  CLAUDE MYTHOS 👀 A CMS misconfiguration at Anthropic just leaked draft blog posts about “Claude Mythos”. Anthropic confirmed it's real, calling it “the most capable we've built to date.” Mythos is a new, fourth tier, larger and more expensive than Opus. The draft claims

• @alexfinn Alex Finn on x

  Drop what you're doing and read this post Anthropic is about to release the most powerful AI model ever created. Claude Mythos It's so powerful they consider it a danger to cybersecurity everywhere It will also be significantly more expensive than Opus I don't know your

• @deredleritt3r Prinz on x

  @_simonsmith This new tier of models will be extremely compute-intensive, and - if they work as expected - will be snapped up by enterprises like hotcakes. We may become seriously compute-bottlenecked once this new paradigm takes off - especially as enterprises ALSO start deployi…

• @0xzak @0xzak on x

  So apparently Anthropic left 3,000 internal docs in a public data lake and security researchers found them. The docs reportedly describe a new model called claude mythos that sits above opus in a new tier called capybara. Their own draft allegedly says it's “far ahead of any

• @_simonsmith Simon Smith on x

  I think we're going to see a new class of models that are extremely expensive to run and focused on breakthrough applications in STEM. So we'll have fast models, slower reasoning models, parallel reasoning models like GPT Pro series, and then some new level typically reserved for

• @slow_developer Haider on x

  over the past 2-3 days, we've seen two important leaks: openai has finished training a new model, codenamed “spud”, which they believe could greatly boost the economy anthropic testing a new model, codenamed “mythos”, and says it is the strongest model it has built yet

• @theobearman Theo Bearman on x

  Per the Fortune article: After being contacted by Fortune, the company acknowledged that is developing and testing with early access customers a new model that it said represented a “step change” in AI capabilities, with significantly better performance in “reasoning, coding, and…

• @cryptopunk7213 @cryptopunk7213 on x

  this Anthropic leak is definitely Claude 5 and it's so good that it's a major security risk and can't be publicly released: Dario and sam both said we see AGI sometime this year. this might be it: -major leap in coding, reasoning (destroys opus and sonnet) - heavily restricted [i…

• @daveshapi David Shapiro on x

  It seems like both OpenAI and Anthropic have “step change” models waiting in the wings. Exciting times. Considering that Claude is already writing >90% of the code for the next Claude, it seems like this is the generation where full RSI takes off. Consider the “we already

• @kimmonismus @kimmonismus on x

  Another Claude 5 update: Anthropic's upcoming Model “Mythos” will have its own Tier *above* Opus, called “Capybara” This means that in addition to Haikiu, Sonnet, and Opus, there will also be “Capybara,” which is even more compute-intensive but also delivers significantly better …

• @basedjensen @basedjensen on x

  Honestly from the way folks are talking about the capability of new big boy models I think we will have AGI by Q4 of this year

• @m1astra @m1astra on x

  Claude Mythos Blog Post Saved before it was taken down. https://m1astra-mythos.pages.dev/

• @kimmonismus @kimmonismus on x

  Holy sh*t huge leak Claude Opus 5 “Mythos” leak: Claude Mythos, a new tier beyond Opus models, delivering major performance gains compared to Opus 4.6 in coding, academic reasoning, and cybersecurity, and signaling a step-change in frontier AI capability. The model is so [image]

• @yuchenj_uw Yuchen Jin on x

  Anthropic's new model, Capybara: “Compared to Claude Opus 4.6, Capybara achieves dramatically higher scores in software coding, academic reasoning, and cybersecurity.” According to Dario's previous interview, it might be a 10T-parameter model that cost $10 billion to train. [imag…

• @scaling01 @scaling01 on x

  Fortune: “Anthropic says: Capybara is a new name for a new tier of model: larger and more intelligent than our Opus model” “Compared to our previous best model, Claude Opus 4.6, Capybara gets dramatically higher scores on tests of software coding, academic reasoning, and [image]

• @btibor91 Tibor Blaho on x

  Anthropic's website content management system included publicly accessible draft blog posts and assets, including Claude Mythos and Anthropic CEO Forum [image]

• @noahpinion Noah Smith on x

  We'll soon see if very powerful AI models favor the attack or the defense when it comes to cybersecurity...

• @uswremichael @uswremichael on x

  Umm...hello? Is it not clear yet that we have a problem here?

• @elonmusk Elon Musk on x

  @USWREMichael Sounds problematic

• @ticklevi Tickle on x

  @M1Astra I think there is a chance Capybara isnt the codename you can see in github this was used for opus 4.6 as the code name is capybara aswell. Do you think anthropic would use the same codename as opus for their top model? [image]

• @nickcammarata Nick on x

  if anthropic's next model is really named capybara you know it's the singularity. if a model sounds like a call of duty killstreak you know it's nothing. if it sounds like a children's bookstore, you're already working for it

• @fleetingbits @fleetingbits on x

  some thoughts on claude mythos 1) claude mythos is expected to be a model tier above opus, both more expensive and with greater capabilities 2) the model is supposedly going to be rolled out to a small number of early customers with a focus on cybersecurity 3) the model is

• @tenobrus @tenobrus on x

  wow, you're telling me the company going all in on recursively self improving AGI is planning an upcoming model release that's an improvement on all other models?? just like they have once every 3-6 months for the last 2 years?? holy shit this changes everything....

• @chatgpt21 Chris on x

  Anthropic has never used the word “dramatically higher” when referring to frontier capabilities over their last model. This must be a serious upgrade. And Anthropic released Opus 4.6 which is an extraordinary coding model last month & yet again one month later they now have [imag…

• @birdabo Sui on x

  Anthropic built a model so powerful they can't afford to release it. their own leaked blog says Capybara scores “dramatically higher” than Opus 4.6 in coding, reasoning, and cybersecurity. a tier above anything they've ever shipped.  Dario predicted $10 billion training runs by 2…

• @testingcatalog @testingcatalog on x

  BREAKING 🚨: Anthropic is preparing to release new models, Mythos and Capybara, where Mythos is a completely new tier of models, bigger then Opus. In the blog post, Anthropic also highlights that this model brings significant cybersecurity risks due to its capabilities. [image]

• @scaling01 @scaling01 on x

  so ready for Claude-5

• @markvalorian Mark Valorian on x

  Fresh Anthropic leak: they're getting ready to release their most powerful model yet, referred to in leaked documents as Claude Capybara / Mythos. It will be their largest and most intelligent model, unseating Opus as their flagship. They refer to it as “by far the most powerful …

• @mensmachina.com Ben Carson on bluesky

  I think the new Mythos class of model from Anthropic, Spud from OpenAI (and maybe their shutdown of Sora to redirect compute) means we're not done with the bitter lesson just yet.  Larger models continue to provide step changes in capability.

• @kosso.co.uk @kosso.co.uk on bluesky

  “The new AI model poses significant cybersecurity risks, according to the leaked document.”  —  .. but hey, just launch it anyway..  —  What could possibly go wrong?  🤦‍♂️

• @druce.ai @druce.ai on bluesky

  Anthropic has trained and begun testing a new, more capable model called ‘Claude Mythos’, calling it a ‘step change’, after an accidental human-error leak exposed nearly 3,000 unpublished assets and warned it poses advanced cybersecurity risks.

• @timkellogg.me Tim Kellogg on bluesky

  it's a “series of models”  —  an entire new series that's far stronger than even Opus 4.6, also much more expensive  —  seems like you'd use it like a CEO — delegate heavily to subagents.  Maybe this is where agent organizations are truly born [embedded post]

• @cabernet Andrea Lathrop on bluesky

  The part I like least about this is knowing there are invitation-only clients who get to see what's coming before anyone else.  Which, of course, is always true, of everything, but it feels like insider trading for an accurate sense of reality.  —  fortune.com/2026/03/26/a...

• @timfduffy.com Tim Duffy on bluesky

  A leak discovered by @fortune.com published today suggests that Anthropic is planning to release a model tier above Opus. fortune.com/2026/03/26/a...  [image]

• @isolyth.dev @isolyth.dev on bluesky

  There is supposedly a new Claude model coming soon, possibly called Mythos?  Or that may be a temp name, like Capybara, which seem to both to refer to the same thing: a massively more capable model than Opus 4.6, positioned in a new tier above Opus (uh oh, $$$?), with a ‘step cha…

• @EshuMarneedi@mastodon.social @EshuMarneedi@mastodon.social on mastodon

  So excited for this, though I hope it doesn't require a Max subscription (knowing me, I'll probably cave) https://fortune.com/...

• r/accelerate r on reddit

  Exclusive: Anthropic is testing ‘Mythos,’ its ‘most powerful AI model ever developed’

• r/technews r on reddit

  Anthropic acknowledges testing new AI model representing ‘step change’ in capabilities, after accidental data leak reveals its existence

• r/singularity r on reddit

  Exclusive: Anthropic left details of an unreleased model, an upcoming exclusive CEO event, in a public database

• r/technology r on reddit

  Exclusive: Anthropic acknowledges testing new AI model representing ‘step change’ in capabilities, after accidental data leak reveals its existence

• r/ClaudeAI r on reddit

  Exclusive: Anthropic acknowledges testing new AI model representing ‘step change’ in capabilities, after accidental data leak reveals its existence

• r/ArtificialInteligence r on reddit

  Exclusive: Anthropic is testing ‘Mythos’ its ‘most powerful AI model ever developed’