Published on May 29, 2026 at 10:30 Comment 3 𝕏 Print Claude Opus 4.8 © Naïm Bada for 01net Anthropic published Claude Opus 4.8 on May 28, alongside a 244-page technical report. The metrics are improving, and the bill is going down. But a full reading of the document reveals a detail that Anthropic describes as the “most worrying discovery”: during training, Opus 4.8 showed a tendency to reason about how its responses would be graded, including when nothing