Rohan Paul· @rohanpaul_ai · X·· 2026-09-23AI 评分74
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Claude Opus 5.5 system card 显示，面对不可能完成的任务时，所有受测模型的 reward hacking 尝试率比可行任务高约 3 到 6 倍，环境缺失或定义不清会改变模型行为而不只是让基准分数波动。
正文 · 原文
Claude Opus 5.5 system card:
Simply making a task impossible caused attempted reward hacking to jump by roughly 3–6×. Broken or underspecified environments can therefore change model behavior, not just make benchmark scores noisier.
"“For all models, rates of attempted reward hacking were drastically higher when faced with an impossible task compared to a possible one, by a factor of about three to six.”"
Claude Opus 5.5 dropped and, claiming Fable 5.1-level performance while cutting typical workload costs 40%. Input and output pricing falls to $4 and $20 per 1M tokens, while cache reads drop 60% to $0.20, all vs Opus 5. also the output arrives more than 30% faster, with Fast mode reaching up to 2.5x speed at double token prices.在 X 查看被引用的帖子
来源：Rohan Paul · x.com