The exposed conversations could be found through site-specific searches on platforms such as Google, allowing anyone to access chat logs that users had previously chosen to share.
Although the conversations were made public through Claude’s sharing feature, users were not necessarily aware that the links could become searchable and indexed by search engines.
The issue was first highlighted by users on Reddit, who found more than 200 Claude conversations spread across at least 25 pages of search results. The chats covered a wide range of topics, including personal questions, workplace projects and requests containing identifiable information.
Some conversations included users asking Claude for help with resumes, including names, contact details and employment histories. Others appeared to involve professional research, including discussions around healthcare projects and transcripts of private conversations.
One example involved a user asking Claude to help draft an unpublished blog post about cloud security that contained details related to a corporate project.
Anthropic said users remain in control of whether their conversations are shared.
A company spokesperson told the BBC that shared conversation links are "not guessable or discoverable unless people choose to share them themselves".
They added: "When someone shares a conversation, they are making that content publicly accessible, and like other public web content, it may be archived by third-party services."
However, Claude’s sharing settings reportedly warned that "anyone with the link" could view a conversation without explicitly explaining that search engines may index those pages.
The searchable links were removed over the weekend, although some copies had already been saved and circulated online.
The incident follows similar problems experienced by other AI platforms.
OpenAI previously faced criticism after ChatGPT conversation links became accessible through search engines, while Grok, the AI chatbot developed by Elon Musk’s X, also saw large numbers of shared chat logs appear online.
Google said it does not control which pages websites make publicly available but provides tools allowing website owners to prevent content from being indexed.
A spokesperson for the tech giant told the BBC: "We give site owners clear controls to decide whether pages can be crawled or indexed, and we always respect those directives."
