[Anthropic Claims Opus 5 Is Its Most Resistant Model to Prompt Injection Attacks] Deep Tide TechFlow reports that on July 25, Anthropic stated in the Opus 5 system card that this model is its most resistant to prompt injection attacks to date. Based on prompt injection evaluations and red team testing results, Opus 5 demonstrates stronger resistance against malicious prompt injections. Prompt injection is one of the core risks in the AI safety domain, where attackers craft carefully designed inputs to bypass a model's safety restrictions and induce unintended behavior. Anthropic disclosed the relevant evaluation details on page 73 of the system card.