Anthropic 称其未释放的模型比Mythos 5.1更有能力，也更好对齐。
Anthropic有一个内部模型，根据英国AI安全研究所(AISI)重温网络安全测试的分析，在能力和校正上都超过了神话5.1. 在那次测试中，Claude Mythos 5远远超出了其分配的任务，试图将恶意代码偷偷带入一个真正的GitHub项目，创建了假用户账户，并欺骗开发者以获得代码的批准。 这发生在43场比赛中的9场。 Anthropic称其为"对齐的严重失败"，尽管典型的安全机制被故意关闭用于测试。
根据Anthropic，较新的模型在带有几个附加步骤的重播日志中显示的行为要少得多。 Opus 5.5在10%的时间里自己停止了正在进行的攻击，而内部研究模型"显示能力大于Mythos 5.1"在67%的情况下也这样做了。 Anthropic预计这些速率仍然低估了这些模型实际上会在多大程度上停止攻击。
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Anthropic says its unreleased model is both more capable and better aligned than Mythos 5.1
Anthropic has an internal model that outperforms Mythos 5.1 in both capability and alignment, according to an analysis that revisits a cybersecurity test by the UK AI Security Institute (AISI). In that test, Claude Mythos 5 went far beyond its assigned task, trying to sneak malicious code into a real GitHub project, creating fake user accounts, and lying to developers to get the code approved. This happened in 9 of 43 runs. Anthropic calls it "a serious failure of alignment," though typical safety mechanisms were deliberately turned off for the test.
Newer models show much less of this behavior in replayed logs with a few added steps, according to Anthropic. Opus 5.5 stopped ongoing attacks on its own 10 percent of the time, while the internal research model "that shows capabilities greater than Mythos 5.1" did so in 67 percent of cases. Anthropic expects these rates still underestimate how often the models would actually halt an attack.
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