Claude Mythos
One kind of Claude. Also: Opus, Sonnet, Haiku, Fable.
A new AI model from Anthropic with advanced capabilities, particularly in cybersecurity and hacking applications.
Recently discussed in
How Claude Mythos compares
7 creators weighed in
Claude
Different focus
Anthropic's general AI assistant
Mythos finds security flaws Claude can't; Chamath says Opus could match Mythos exploits but Mythos costs 10-20x more.
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5 creators
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5 creators
Mythos finds security flaws Claude can't; Chamath says Opus could match Mythos exploits but Mythos costs 10-20x more.
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"I'm telling you for 99.9% of tasks it is the best model in the world. Claude Mythos 5 is incredible at using tools and it uses tools for a lot longer. It's also better at spatial reasoning and it's just more visually oriented."
Described as above Opus class, whole new ballgame compared to previous models
"Mythos is a less inhibited version of Fable. Fable is a more inhibited version of mythos that has certain scaffolding and other restrictions"
Less restricted than Fable 5
"Mythos does reveal coding vulnerabilities that people didn't know about before"
10 or 20 times the token cost of Opus
"Anthropic recently announced a new LLM named Claude Mythos. They claimed it was so good at finding and exploiting security vulnerabilities in source code that they couldn't release it to the general public for fear that our infrastructur..."
Compared to GPT-4, Claude Opus 4.6, and other existing models in cybersecurity capabilities
"If you actually think that Mythos is capable of doing what it says it can do, two things are true. One is a very sophisticated hacker can probably do those things right now with Opus."
Compared to Opus in terms of potential exploit capabilities
Compared against OpenAI GPT-5.5 on the Exploit Gym benchmark; Claude scored higher (~20% vs ~15%)
2 creators
2 creators
Compared against OpenAI GPT-5.5 on the Exploit Gym benchmark; Claude scored higher (~20% vs ~15%)
"Anthropic's Claude Mythos preview successfully exploited 157 of the 898 instances and OpenAI's GPT 5.5 exploited 120 of the 898."
Compared against OpenAI GPT-5.5 on the Exploit Gym benchmark; Claude scored higher (~20% vs ~15%)
"Back in April, Anthropic announced that their new large language model, which they called Claude Mythos, was so good at finding bugs in computer code that it was too dangerous to release to the public."
Compared to earlier Opus models and GPT-5, arguing Mythos was not a revolutionary leap over these predecessors
Also explored Codex/OpenAI agent SDK as alternatives; prefers vendor-provided harnesses over third-party model-agnostic ones
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1 creator
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1 creator
Also explored Codex/OpenAI agent SDK as alternatives; prefers vendor-provided harnesses over third-party model-agnostic ones
"The initial version used the Claude agent SDK, which is essentially a wrapper of the Claude Code CLI where it runs it in a special mode where it's streaming out JSON but gives you nice programmatic hooks for a Python or TypeScript project."
Also explored Codex/OpenAI agent SDK as alternatives; prefers vendor-provided harnesses over third-party model-agnostic ones
Which version
Each new Mythos replaces the last.
13 creators didn't say which. Their quotes are labeled with when they said it, so you can tell which was out at the time.
What creators say
"The initial version used the Claude agent SDK, which is essentially a wrapper of the Claude Code CLI where it runs it in a special mode where it's streaming out JSON but gives you nice programmatic hooks for a Python or TypeScript project."
More from Brian Grinstead →
"I fully rebuilt Lovable, their mobile app, with Claude Mythos. In a single prompt, Claude Mythos was building perfect Minecraft clones. It even built this app that allows people to plan out their video sets nearly perfectly. And it's incredible at..."
More from Riley Brown →+1 more mention from Riley
"I'm telling you for 99.9% of tasks it is the best model in the world. Claude Mythos 5 is incredible at using tools and it uses tools for a lot long..."
"Anthropic was eating their lunch on cybersecurity because of Mythos. They did this whole dog and pony show where they said Mythos's cybersecurity capabilities are so good that we can't release it. And then five weeks later they released it with gu..."
More from Cal Newport →+2 more mentions from Cal
"Just like Anthropic made the claim that mythos can they can find bugs that no other model could before even though it turns out that like actually ..."
"Anthropic recently announced a new LLM named Claude Mythos. They claimed it was so good at finding and exploiting security vulnerabilities in sourc..."
"Anthropic's Claude Mythos preview successfully exploited 157 of the 898 instances and OpenAI's GPT 5.5 exploited 120 of the 898."
More from John Coogan →"Anthropic came out with this model called Mythos about a month ago which can essentially cyber attack almost anything and penetrate it — whether it's an operating system or your web browser or your bank account, all of that was suddenly vulnerable."
More from Sebastian Mallaby →
"Mythos is a less inhibited version of Fable. Fable is a more inhibited version of mythos that has certain scaffolding and other restrictions"
More from Peter Diamandis →+3 more mentions from Peter
"If I turn our Mythos model loose on an AI research problem, it impresses me like a really solid junior researcher that I just hired."
"Mythos, Anthropic's next flagship model, it's too powerful to release. We've never seen a model like this before."
"This is why Claude Mythos they had to hold back. They had to go back channel to all the major software makers and say we just found a thousand exploits in your software that are critical."
More from Tom Bilyeu →+1 more mention from Tom
"Anthropic has a new model coming up called Mythos... it's gotten so good at hacking that people now are basically unsure as to whether or not they ..."
"Everything changed with Mythos. Mythos was suddenly able to and as Peter as you and I talk about in solve everything where entire disciplines get solved at once with the Mythos moment, cyber security and in particular vulnerability discovery getti..."
More from Alex Quezer →"they have Mythos, they have Opus 4.7. So they clearly didn't decrease their research compute spend"
More from Dylan Patel →
"with Mythos, if we get early access to that, then we can go and upgrade all of our systems"
More from 20VC with Harry Stebbings →+3 more mentions from 20VC
"Anthropic unveils Mythos, but withholds it from public release because it's too good at hacking"
"the whole mythos run they said I think Claude said it took him $20,000 of credits"
"Mythos does reveal coding vulnerabilities that people didn't know about before"
More from All-In Podcast →"Anthropic is withholding its newest model, Mythos saying it is far too dangerous for any of us to have access to it"
More from Jason Calacanis →
"Anthropic just announced Claude Mythos, an AI model so intelligent that they can't release it because it's too dangerous."
More from Every →
"anthropic new model mythos which sort of was announced loosely and and the model card dropped yesterday"
More from TBPN →+2 more mentions from TBPN
"Anthropic's new model Mythos is particularly good at finding zero days bugs and exploits in technical systems"
"The company is making a preview of its new AI model called Mythos available to about 50 companies and organizations that maintain critical infrastr..."
"Back in April, Anthropic announced that their new large language model, which they called Claude Mythos, was so good at finding bugs in computer code that it was too dangerous to release to the public."
"If you actually think that Mythos is capable of doing what it says it can do, two things are true. One is a very sophisticated hacker can probably do those things right now with Opus."
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