Claude Mythos 5.2
A version of the large language model in the Anthropic Claude series, sharing the same underlying model as Fable 5.2. Access requires application through the life sciences verification program or the cybersecurity verification program, and it provides professional institutions with a channel that has fewer restrictions.
Core Facts
Anthropic released two new models, Claude Fable 5.2 and Claude Mythos 5.2.
Fable 5.2 costs about $8.40 per million tokens, compared with $10.50 for Fable 5.1.
Fable 5.2's output speed is up to 30% faster than Fable 5.1 and Methos 5.1.
Timeline (last 90 days)
The integration of Claude Mythos 5.2 is not a standalone product launch, but rather the embedding of an external frontier model into the existing agent platform Devin Security, where the platform handles context organization, tool calling, and task orchestration, and the model is invoked as the reasoning core.
Claude Mythos 5.2 is now available on Devin Security, open to customers who obtain access to frontier cybersecurity models through Devin.
Mythos 5.2 targets scenarios that require stricter safety boundaries.
There is currently no clear information on Mythos 5.2's pricing or its benchmark performance on FrontierCode 2.0.
Currently available public information has not yet disclosed the specific differences in Mythos 5.2's safety policy.
Anthropic has not positioned Fable 5.2 and Mythos 5.2 as models at different capability tiers, but rather makes safety policy the main axis of product differentiation.
Mythos 5.2 found a new method for predicting the entire structure of the "one-shell" protein capsid, accurately modeling 28 of the 34 tested.
Fable 5.2 and Mythos 5.2 are two versions of the same underlying model; the Fable version has strong safety protections, and the Mythos version requires applying for use through the official verification program.
Fable 5.2 costs about $8.40 per million tokens, compared with $10.50 for Fable 5.1.
Mythos 5.2 found a new method for predicting complete capsid structures and successfully modeled most of the capsids it attempted in internal Anthropic tests.
19 more timeline events
All Facts (20)
Anthropic released two new models, Claude Fable 5.2 and Claude Mythos 5.2.
80%Partially VerifiedFable 5.2 costs about $8.40 per million tokens, compared with $10.50 for Fable 5.1.
70%Partially VerifiedFable 5.2's output speed is up to 30% faster than Fable 5.1 and Methos 5.1.
65%UnverifiedThe integration of Claude Mythos 5.2 is not a standalone product launch, but rather the embedding of an external frontier model into the existing agent platform Devin Security, where the platform handles context organization, tool calling, and task orchestration, and the model is invoked as the reasoning core.
50%UnverifiedAnthropic has not positioned Fable 5.2 and Mythos 5.2 as models at different capability tiers, but rather makes safety policy the main axis of product differentiation.
50%UnverifiedCurrently available public information has not yet disclosed the specific differences in Mythos 5.2's safety policy.
50%UnverifiedThere is currently no clear information on Mythos 5.2's pricing or its benchmark performance on FrontierCode 2.0.
50%UnverifiedMythos 5.2 targets scenarios that require stricter safety boundaries.
50%UnverifiedFable 5.2 and Mythos 5.2 are two versions of the same underlying model; the Fable version has strong safety protections, and the Mythos version requires applying for use through the official verification program.
50%UnverifiedMythos 5.2 found a new method for predicting the entire structure of the "one-shell" protein capsid, accurately modeling 28 of the 34 tested.
50%UnverifiedMythos 5.2 found a new method for predicting complete capsid structures and successfully modeled most of the capsids it attempted in internal Anthropic tests.
50%UnverifiedIn multidisciplinary reasoning, Fable 5.2 scored 74.2% on the "Humanity's Last Exam" benchmark; Mythos 5.2 scored 85.1% on the protein design benchmark.
50%UnverifiedThe official team provided 17 life science evaluations, and Mythos 5.2 received the highest score in several of them.
50%UnverifiedMythos 5.2 successfully modeled 28 of 34 capsid structure predictions.
50%UnverifiedClaude Fable 5.2 is positioned for technical work, covering coding, computer use and 3D interaction; Claude Mythos 5.2 is positioned for scientific tasks, especially life sciences.
50%UnverifiedThe official team says the new model's output speed is up to 30% faster than the previous generation.
50%UnverifiedThe Reddit user added that they also received Mythos 5.2 and Fable 5.2.
50%UnverifiedFable 5.2 and Mythos 5.2 are the same underlying model, differing only in access permissions.
50%UnverifiedIn pre-release testing, these two models helped engineers complete software migrations that had previously been difficult to advance.
50%UnverifiedIn pre-release testing, these two models designed three working electronic devices.
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