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Six Reasons Claude Mythos Is an Inflection Point for AIand Global Security

Anthropic launched Claude Fable 5 on Tuesday, the first publicly available version of its Mythos-class AI model. The release follows the April debut of Claude Mythos Preview, which was restricted to a limited group of partners under Project Glasswing due to cybersecurity concerns.

Anthropic launched Claude Fable 5 on Tuesday, the first publicly available version of its Mythos-class AI model. The release follows the April debut of Claude Mythos Preview, which was restricted to a limited group of partners under Project Glasswing due to cybersecurity concerns.

Fable 5 uses safety classifiers that route queries related to cybersecurity, biology, chemistry and distillation to the less powerful Claude Opus 4.8 model instead. Anthropic said early data shows at least 95% of Fable 5 sessions run entirely on the model's own responses, with no fallback.

Fable 5 uses safety classifiers that route queries related to cybersecurity, biology, chemistry and distillation to the less powerful Claude Opus 4.8 model instead. Anthropic said early data shows at least 95% of Fable 5 sessions run entirely on the model's own responses, with no fallback.

Anthropic conducted more than 1,000 hours of external bug bounty testing and engaged outside red-teaming organizations, neither of which found a universal jailbreak for Fable 5. The UK AI Safety Institute made progress toward one within an initial testing window, Anthropic acknowledged.

Anthropic conducted more than 1,000 hours of external bug bounty testing and engaged outside red-teaming organizations, neither of which found a universal jailbreak for Fable 5. The UK AI Safety Institute made progress toward one within an initial testing window, Anthropic acknowledged.

Alongside Fable 5, Anthropic released Claude Mythos 5 — the same underlying model but with safeguards lifted in some areas — initially available only to Project Glasswing partners, including firms such as Amazon Web Services, Apple, Google, Microsoft and JPMorgan Chase.

Alongside Fable 5, Anthropic released Claude Mythos 5 — the same underlying model but with safeguards lifted in some areas — initially available only to Project Glasswing partners, including firms such as Amazon Web Services, Apple, Google, Microsoft and JPMorgan Chase.

Both Fable 5 and Mythos 5 are priced at $10 per million input tokens and $50 per million output tokens, roughly double the cost of Claude Opus 4.8 but about half the price of Claude Mythos Preview. Anthropic requires 30-day data retention for all traffic on Mythos-class models.

Both Fable 5 and Mythos 5 are priced at $10 per million input tokens and $50 per million output tokens, roughly double the cost of Claude Opus 4.8 but about half the price of Claude Mythos Preview. Anthropic requires 30-day data retention for all traffic on Mythos-class models.

The Fable 5 launch comes as Anthropic confidentially filed IPO paperwork with the SEC, with the company reporting a revenue run rate of $47 billion, up from $10 billion the prior year. A recent funding round valued Anthropic at $965 billion, surpassing rival OpenAI's March valuation of $852 billion.

The Fable 5 launch comes as Anthropic confidentially filed IPO paperwork with the SEC, with the company reporting a revenue run rate of $47 billion, up from $10 billion the prior year. A recent funding round valued Anthropic at $965 billion, surpassing rival OpenAI's March valuation of $852 billion.

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Anthropic Launches Claude Fable 5 With Safety Guards

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Anthropic Launches Claude Fable 5 With Safety Guards

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