Claude Opus 4.1は1Mトークン超の大規模文脈を生かしたロングフォーム推論・ナレッジワーク領域に最適解。安全性（憲章/倫理AI）にも大きく注力、高度な業務文書・契約・法務・学術解析で運用多数。プログラミングをする人が良く選ぶような印象。Sonnet 3.7の時に爆発的に利用者が増えた感じ。 Sonnet/Haikuはより汎用的（Sonnet）およびコンパクトな大量対話運用・Bot最適（Haiku）用途へ。
引用されていた通知内容は下記になります。 ご参考）Afilias社から弊社への通知引用
------------------------------------------
As you know, Afilias continuously monitors names in this TLD for any signsof abuse
that may violate its Anti-Abuse Policy (http://info.info/about/afilias-anti-abuse-policy )
or indicate potential violations of the Registry-Registrar Agreement (RRA).
Domain abuse creates security and stability issues for the registry, registrars, registrants,
and Internet users in general, and must therefore be eliminated insofar as possible.
The following registrants have recently registered domains that have been confirmed
as engaging in or associated with spam activity:
※ この箇所にお客様のドメインを指す情報が記載されています
Each of these registrants currently have domain(s) appearing on
spam domain block lists, nameserver blacklists, and/or IP blacklists.
------------------------------------------
