AISimon Willisonabout 2 hours ago
Quoting Boris Cherny
ByteBrief summary
1 min readMore 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 This is a quotation collected by Simon Willison, posted on 25th July 2026. A Fireside Chat with Cat and Thariq from the Claude Code team - 21st July 2026 Kimi K3, and what we can still learn from the pelican benchmark - 16th July 2026.
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