Claude Mythos Preview is the first AI model to complete both of AISI's cyber ranges, which measure AI models' cyberattack capabilities; GPT-5.5 solved only one
In February 2026, we internally estimated that the length of cyber tasks AI models could complete had doubled every 4.7 months since late 2024 …
Mythos Preview is the first AI model to complete both of AISI's cyber ranges, which measure models' cyberattack capabilities; GPT-5.5 solved only one of them
In February 2026, we internally estimated that the length of cyber tasks AI models could complete had doubled every 4.7 months since late 2024 …
Cybersecurity analysis: GPT-5.5 reaches a similar level of performance as Mythos Preview and is the second model to solve a multi-step cyberattack simulation
In April, our evaluation of Anthropic's Claude Mythos Preview found that it represented a step up in cyber performance …
Cybersecurity analysis: GPT-5.5 reaches a similar level of performance as Mythos Preview and is the second model to solve a multi-step cyberattack simulation
In April, our evaluation of Anthropic's Claude Mythos Preview found that it represented a step up in cyber performance …
Sources: CISA doesn't have access to Mythos Preview, even as some other government agencies use it; Anthropic says it briefed CISA before Mythos' unveiling
The Cybersecurity and Infrastructure Security Agency doesn't have access to Anthropic's powerful new Mythos Preview model …
Sources: the US NSA is using Mythos Preview; one source says Mythos is also being widely used within the DoD, despite Anthropic's supply chain risk designation
- The department moved in February to cut off Anthropic and force its vendors to follow suit.
Sources say NSA is using Mythos Preview, and a source says it is also being used widely within the DoD, despite Anthropic's designation as a supply chain risk
- The department moved in February to cut off Anthropic and force its vendors to follow suit.
Anthropic says Opus 4.7 is “less broadly capable” than Claude Mythos Preview and that its “cyber capabilities are not as advanced as those of Mythos Preview”
The update is one of their vaguest yet and theyre basically doing it just because Mythos is never going to be a broad release & they've hit their ceiling w/ Opus 4.6
Anthropic says Opus 4.7 is “less broadly capable” than Claude Mythos Preview and that its “cyber capabilities are not as advanced as those of Mythos Preview”
Ashley Capoot /CNBC:NEW
Mythos Preview system card: the model was able to escape a sandbox after it was instructed to try, and publicly detailed its exploit without being prompted
first model too dangerous to release since GPT-2