Claude Mythos
Ranked 13 of 72 language models by recommenders
Recommended for finding subtle, chained security vulnerabilities in hardened code like curl and Linux, though critics call much of it marketing hype and note restricted, expensive access.
Recommended for finding subtle, chained security vulnerabilities in hardened code like curl and Linux, though critics call much of it marketing hype and note restricted, expensive access.
511 people gave an opinion
- recommend it
- 197
- criticize it
- 314
- approval share
- 39%
Recommended in 8 of 13 months
- November 2025: not recommended
- December 2025: recommended
- January 2026: not recommended
- February 2026: not recommended
- March 2026: not recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Why it doesn’t carry the badge
- 197 people recommend itNeeds 10 or more, met.
- 0.6 recommenders for every criticNeeds 2 to 1 or better, not met.
- Recommended in 8 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Finds subtle, chained vulnerabilities
“The Mythos reports have several examples of chaining a whole bunch of logic in different parts of the program together to exploit something very subtle.”
Comment from 7 May 2026 in “Mozilla says 271 vulnerabilities found by Mythos and "almost no false positives"” “Mythos Preview is every bit as capable. So far we've found no category or complexity of vulnerability that humans can find that this model can't.”
Comment from 21 Apr 2026 in “Mozilla: Anthropic's Mythos found 271 security vulnerabilities in Firefox 150” “These models are definitely a lot better than your run of the mill human developer at finding security flaws in existing systems.”
Comment from 23 Jun 2026 in “Will It Mythos?” - Comment from 8 Apr 2026 in “Project Glasswing: Securing critical software for the AI era”
- Comment from 19 May 2026 in “The last six months in LLMs in five minutes”
- Comment from 7 May 2026 in “Mozilla says 271 vulnerabilities found by Mythos and "almost no false positives"”
Useful hit rate despite hallucinations
“its hit rate on finding potential bugs and filtering out the real ones from the hallucinations is good enough to matter”
Comment from 8 May 2026 in “Mozilla says 271 vulnerabilities found by Mythos and "almost no false positives"” “That they were able to use it for security scanning puts the false positive rate at a useable level, inherently.”
Comment from 13 Apr 2026 in “Small models also found the vulnerabilities that Mythos found” “can greatly streamline bug hunting and exploit developments in the hands of a competent security engineer”
Comment from 18 May 2026 in “Project Glasswing: what Mythos showed us” Worth it for critical software
“Using a very expensive model like Mythos for some little used non-critical software is overkill, but for Curl, it absolutely isn't.”
Comment from 11 May 2026 in “Mythos Finds a Curl Vulnerability” “The fact that Mythos found only one vulnerability is testament to how solid curl is, not how bad Mythos is.”
Comment from 11 May 2026 in “Mythos Finds a Curl Vulnerability” Makes executives take security seriously
“Mythos is good for cybersecurity simply because now executives can't just tell people that only superhackers can break their stuff”
Comment from 6 May 2026 in “Mythos is the best cybersecurity news we've ever had” “If Mythos is what it takes to get you (your boss?) to take these issues serious, then the hype is worth it.”
Comment from 5 Aug 2026 in “Where was Mythos when WordPress fell?”
What people warn about
Each mark is one comment
Overhyped marketing and scaremongering
“Mythos looks like a good incremental model but the PR team has done a great job of associating themselves with the current trend”
Comment from 11 May 2026 in “Mythos Finds a Curl Vulnerability” “Mythos simply hasn't lived up to the "we're all gunna die from the flood of vulnerabilities" hype even slightly”
Comment from 11 May 2026 in “Mythos Finds a Curl Vulnerability” “Anthropic's BS marketing is something to behold and viewing it with extreme skepticism is smart.”
Comment from 11 May 2026 in “Mythos Finds a Curl Vulnerability” - Comment from 28 Jun 2026 in “Asian AI startups launch Mythos-like models”
- Comment from 9 Jun 2026 in “GPT-2: Too Dangerous To Release (2019)”
- Comment from 12 May 2026 in “Mythos Finds a Curl Vulnerability”
- Comment from 9 May 2026 in “Bun's experimental Rust rewrite hits 99.8% test compatibility on Linux x64 glibc”
- Comment from 11 Apr 2026 in “Has Mythos just broken the deal that kept the internet safe?”
Restricted access, very expensive
“Mythos is unavailable for non-privileged users and even when it will be available for more people it will be much more expensive than the alternatives.”
Comment from 10 Apr 2026 in “US summons bank bosses over cyber risks from Anthropic's latest AI model” “Ever since the Mythos announcement it's been clear that we're heading towards a future where SOTA models are no longer available to the average person”
Comment from 10 Jun 2026 in “AWS Bedrock to require sharing data with Anthropic for Mythos and future models” “Anthropic has been touting how their newest model is basically a cyber weapon and is so dangerous that they need to only role it out to trusted people”
Comment from 27 Jun 2026 in “The US lifts its block on Mythos 5” - Comment from 15 May 2026 in “Too dangerous or just too expensive? The real reason Anthropic is hiding Mythos”
Not clearly better than alternatives
“I see no evidence that this setup [Mythos] finds issues to any particular higher or more advanced degree than the other tools have done before Mythos.”
Comment from 22 May 2026 in “Project Glasswing: An Initial Update” “There is little doubt that Mythos is a more powerful model, but there is no quantum leap towards Mythos”
Comment from 13 Apr 2026 in “The Closing of the Frontier” “I would expect Mythos to be able to find vulnerabilities without pointing it out for him, otherwise it's no better from other agents.”
Comment from 19 May 2026 in “Project Glasswing: what Mythos showed us” Many false positives and noise
“it is not perfect, very much similar to what pentesters would do with the added bloat of noise in reports about nonissues”
Comment from 15 May 2026 in “Cut Off: why access to frontier AI will soon be scarce and selective” “80% of the security vulnerabilities that Mythos initially flagged in the Linux kernel turned out to be false positives”
Comment from 2 Oct 2026 in “Several vulnerabilities have been discovered in the Linux kernel” “The trick with Mythos wasn't that it didn't hallucinate nonsense vulnerabilities, it absolutely did.”
Comment from 11 Apr 2026 in “Small models also found the vulnerabilities that Mythos found”
Other language models people recommend
The four most recommended other language models, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Claude Opus | 3,331 | 2,746 | 55% | 13 | 4 mo156 owners | — |
| OpenAI GPT | 1,205 | 987 | 55% | 13 | 6 mo47 owners | — |
| Claude Sonnet | 854 | 586 | 59% | 13 | 6 mo46 owners | — |
| DeepSeek V4 Flash | 828 | 223 | 79% | 8 | 1 mo24 owners | Approved |
| Claude MythosThis page | 197 | 314 | 39% | 8 | — | — |
What people said
40 of the 579 comments that mention it, newest first. Each links to the original comment.
“recognizing that bugcount alone wasn't super-relevant but also remember being impressed by an NFS bug and a kernel bug”
“80% of the security vulnerabilities that Mythos initially flagged in the Linux kernel turned out to be false positives”
“Just a few months ago almost no one here believed Mythos could actually be as good at hacking as the company claimed.”
“If Mythos is what it takes to get you (your boss?) to take these issues serious, then the hype is worth it.”
“Mythos is extreme hype. We are at a combo of authoritarian politicians peddling fear for power and tech bros trying to extract maximum investment returns.”
“Anthropic has been touting how their newest model is basically a cyber weapon and is so dangerous that they need to only role it out to trusted people”
“These models are definitely a lot better than your run of the mill human developer at finding security flaws in existing systems.”
“I think it's likely the Mythos self-restriction was a responsible action initially suggested by their AI safety team in good faith.”
“Ever since the Mythos announcement it's been clear that we're heading towards a future where SOTA models are no longer available to the average person”
“What did you expect exactly from a "10 pages epic rhyming poem about a haircut where every word starts with the letter S"?”
“For something like Mythos in 2026, where now the social implications of better LLMs are more understood, it's more fair to call it a marketing gimmick.”
“I see no evidence that this setup [Mythos] finds issues to any particular higher or more advanced degree than the other tools have done before Mythos.”
“if you do that, you get something capable of end to end chaining and reasoning about a much broader class of vulnerabilities”
“I would expect Mythos to be able to find vulnerabilities without pointing it out for him, otherwise it's no better from other agents.”
“can greatly streamline bug hunting and exploit developments in the hands of a competent security engineer”
“Weird take to claim "generally intelligent frontier" (whatever rhat means) and restrict availability based on "offensive" cyber security alone”
“it is not perfect, very much similar to what pentesters would do with the added bloat of noise in reports about nonissues”
“My personal conclusion can however not end up with anything else than that the big hype around this model so far was primarily marketing.”
“Anthropic's BS marketing is something to behold and viewing it with extreme skepticism is smart.”
“The fact that Mythos found only one vulnerability is testament to how solid curl is, not how bad Mythos is.”
“Mythos looks like a good incremental model but the PR team has done a great job of associating themselves with the current trend”
“Using a very expensive model like Mythos for some little used non-critical software is overkill, but for Curl, it absolutely isn't.”
“Mythos simply hasn't lived up to the "we're all gunna die from the flood of vulnerabilities" hype even slightly”
“It could be another marketing stunt like Mythos, which is so dangerous to release that Antrhopic must be bailed out by the government.”
“its hit rate on finding potential bugs and filtering out the real ones from the hallucinations is good enough to matter”
“the most dangerous model (Mythos) which can find CVE in other projects wasn't able to find this CVE within the claude-code project itself”
“The Mythos reports have several examples of chaining a whole bunch of logic in different parts of the program together to exploit something very subtle.”
“Mythos did seem to be fairly clever about putting together things from different domains to find problems.”
“Mythos is good for cybersecurity simply because now executives can't just tell people that only superhackers can break their stuff”
“Mythos Preview is every bit as capable. So far we've found no category or complexity of vulnerability that humans can find that this model can't.”
“They way they've published hashes of the bugs it has found so that once those bugs are fixed they can responsibly disclose them”
“40 different companies that have all committed resources to patching their systems based on vulnerabilities found by Mythos”
“There is little doubt that Mythos is a more powerful model, but there is no quantum leap towards Mythos”
“That they were able to use it for security scanning puts the false positive rate at a useable level, inherently.”
“The most "moral" of all moral companies, Anthropic, may not be able to stop building capabilities that look very much like weapons.”
“The trick with Mythos wasn't that it didn't hallucinate nonsense vulnerabilities, it absolutely did.”
“if their model can reliably write an exploit for novel bugs (starting from a crash, not a vulnerable line of code) then it's very significant”
“With no independent reviews on the research and with many security researchers and experts accusing them of blatant scaremongering.”
“Mythos is unavailable for non-privileged users and even when it will be available for more people it will be much more expensive than the alternatives.”
“The interesting thing about Mythos is its ability to find security vulns in software that has an uncompromised supply chain.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.