Anthropic warns insurers may lack capacity for a catastrophic AI loss

Anthropic has told investors that no single insurer, and possibly the insurance industry as a whole, may have the capacity to cover the harm from a catastrophic AI incident, in the registration statement for its share sale filed with the US Securities and Exchange Commission on 26 October.

For underwriters pricing AI liability, it is a leading model developer saying its own potential exposure may exceed what the market can write.

"With the scale of harm that could result from a catastrophic AI-related incident, no single insurer, and potentially the insurance industry in the aggregate, may have sufficient capacity or expertise to underwrite insurance commensurate with such exposure," the filing says.

It adds that "the insurance market for AI-specific risks is nascent and evolving", and that Anthropic may be unable to obtain cover for certain AI-related liabilities on commercially reasonable terms, or at all.

The filing says its models "may behave in ways that no user or developer intended" and that claims arising from such actions could result in substantial liability, and that some agreements with external evaluators of its models require it to indemnify them, without a cap, against certain third-party claims. It also says insurance may not fully cover copyright claims, after a $1.5bn settlement with authors approved in July 2026.

The London market has started to write affirmative cover. In April 2025 Chaucer co-developed a standalone AI liability product with Armilla AI, a Lloyd's coverholder, covering losses from failures such as hallucinations and model drift.

The offering includes a public offering in the United Kingdom, although Anthropic does not intend to list its shares there.

Related coverage: Criminals sell AI hacking tool that runs on stolen API keys and Bank of England and FCA survey finds 93% of responding insurers use AI.

Sources

• Anthropic PBC, Form S-1, 26 Oct 2026
• Chaucer, AI insurance product with Armilla, 22 Apr 2025
• Armilla, affirmative AI liability insurance, 30 Apr 2025

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