# Security researchers used Anthropic's Claude to hack OpenAI's internal systems in under 72 hours

> Source: <https://the-decoder.com/security-researchers-used-anthropics-claude-to-hack-openais-internal-systems-in-under-72-hours/>
> Published: 2026-09-18 17:20:30+00:00

Three security researchers used Anthropic's Claude models to break into OpenAI's internal systems through its community forum in less than 72 hours. According to the team, Opus 5 succeeded where its predecessor couldn't bypass a common security measure. The attack shows how newer AI models can cut the time and expertise needed to exploit security flaws.

The article [Security researchers used Anthropic's Claude to hack OpenAI's internal systems in under 72 hours](https://the-decoder.com/security-researchers-used-anthropics-claude-to-hack-openais-internal-systems-in-under-72-hours/) appeared first on [The Decoder](https://the-decoder.com).