Fable 5.2, Mythos 5.2: Anthropic Launches Powerful AI Models Ahead Of Wall Street Debut

Last Updated:November 10, 2026, 01:19 IST

Both are built on the same underlying model. Fable 5.2 has safeguards that block most cybersecurity and biology tasks, which lets Anthropic offer it to all users.

Anthropic logo and a keyboard in this illustration, taken on October 19, 2026. (REUTERS photo)

Ahead of a highly anticipated IPO launch this month, Anthropic has announced that it will release updated versions of two of its most powerful artificial intelligence (AI) models.

The new models, Fable 5.2 and Mythos 5.2, can perform up to 30 per cent faster than earlier versions, particularly on complex tasks such as coding, while costing 20 percent less, the company said on Monday.

Fable And Mythos Get New Updates

Both models are built on the same underlying technology. While Fable 5.2 has safeguards that restrict most cybersecurity and biology-related tasks, making it available to all users, Mythos 5.2 has fewer restrictions and is limited to approved organisations working in cybersecurity or biomedical research, AFP reported.

The earlier versions of both models were withdrawn days after their June launch following a US Commerce Department order citing national security concerns. The restrictions were lifted weeks later.

Anthropic Eyes $100 Billion IPO

The updated models come as Anthropic prepares for its initial public offering (IPO), reportedly planned for the week of November 16. The company is expected to raise up to $100 billion, potentially making it the largest IPO ever. Its valuation could exceed $1 trillion, although estimates have dropped from an earlier projection of $2 trillion.

The company’s stock market debut is expected to show whether the AI investment boom driving US economic growth can continue.

Anthropic’s revenue surged to $17 billion in the third quarter from $1.4 billion a year earlier. However, its operating loss stood at $567 million as the company spent more on computing capacity.

Intensifying competition from OpenAI and cheaper AI models, particularly from China, has also slowed sales growth. Meanwhile, concerns over heavy AI spending by major technology companies, regulatory uncertainty and restrictions on data centre construction have added to investor worries.

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What improvements do the new Fable 5.2 and Mythos 5.2 AI models offer?

The updated Fable 5.2 and Mythos 5.2 models perform up to 30 percent faster than earlier versions, especially on complex tasks like coding, while also costing 20 percent less. Both models are built on the same underlying technology.

How do the access restrictions differ between Fable 5.2 and Mythos 5.2?

Fable 5.2 includes safeguards that restrict most cybersecurity and biology-related tasks, making it accessible to all users. In contrast, Mythos 5.2 features fewer restrictions and is strictly limited to approved organizations working in cybersecurity or biomedical research.

What are Anthropic’s expectations and financial details regarding its upcoming IPO?

Anthropic is preparing for an initial public offering planned for the week of November 16, where it expects to raise up to $100 billion. Its valuation could exceed $1 trillion, following a third-quarter revenue surge to $17 billion alongside an operating loss of $567 million.

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Manisha RoySenior Sub-Editor

Manisha Roy is a Senior Sub-Editor at News18.com, with over 7 years of experience in journalism. She covers politics and a wide range of hard news, with a keen interest in national and international d…Read More

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