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Models/Simon Willison LLMs/July 25, 2026 at 12:42 AM

Quoting Boris Cherny

More than any of these eval scores, what is most exciting to me is something else: Opus 5 is our least prompt injectable model yet. It is a bit buried in the system card, but across PI evals and red teaming, Opus 5 is very hard to prompt inject successfully. — Boris Cherny , here's that System Card section , page 73 Tags: ai , prompt-injection , generative-ai , llms , anthropic , claude , boris-cherny

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