Claude Opus 4.8：「ささやかだが確かな改善」
AnthropicがClaude Opus 4.8をリリース。今回の特徴は「正直さ（honesty）」の向上で、前モデルと比べて根拠のない主張を約4分の1に削減。価格やコンテキストウィンドウ（100万トークン）は4.7から変わらず。新機能として会話途中でのシステムメッセージ変更や、プロンプトキャッシュの最小トークン数引き下げ（1024トークン）が追加された。
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