Model Releases
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 t
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: prompt-injection, anthropic, claude, generative-ai, ai, llms, boris-cherny
Related
- Opus 5 is a great model for coding, data analysis, design, biology, knowledge work. More than any of these eval scores, what is most excitin…
- Changes in the system prompt between Claude Opus 4.6 and 4.7
- Introducing Claude Opus 5
Source: Simon Willison | 2026-07-25