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Claude Opus 5 Strengthens Resistance to Prompt Injection

·2026.07.25 09:42

Key point

Anthropic announced that its Claude Opus 5 shows very strong resistance to prompt injection attacks compared to previous models.

Details

Anthropic's Claude Opus 5 has shown far stronger resistance to Prompt Injection attacks than previous models.

According to Boris Cherny, this is based on the PI (Prompt Injection) evaluation and red-team testing results in the model's System Card. Opus 5 is regarded as the model that is hardest to successfully prompt-inject among those released so far.

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