ℏεsam(@Hesamation):SOME DETAILS FROM OPUS 5.5 BLOG: > most cyber tasks still get routed to Opus 4.8 > if often knows it’s being evaluated > that makes real world behavior harder to assess > best alignment results yet on 2,000 scenarios > 85% fewer attempts to cross containment boundaries > matches or beats Mythos 5.1 on biology > they wants to rely less on reading CoT and more on interpretability > tightening RL env filtering as a major source of misalignment > they still argue for government regulations

2026.09.22 17:23

SOME DETAILS FROM OPUS 5.5 BLOG: > most cyber tasks still get routed to Opus 4.8 > if often knows it’s being evaluated > that makes real world behavior harder to assess > best alignment results yet on 2,000 scenarios > 85% fewer attempts to cross containment boundaries > matches or beats Mythos 5.1 on biology > they wants to rely less on reading CoT and more on interpretability > tightening RL env filtering as a major source of misalignment > they still argue for government regulations > text watermarking is included

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