Claude Code has released v2.1.239. The estimates in /cost and --max-budget-usd now reflect the 1.1x data-residency markup that had never been shown. It also fixes a bug where responses were silently re-run in non-streaming mode behind a Bedrock proxy──quietly double-billing──bringing your local cost
Claude Codeがv2.1.239を公開。/cost や --max-budget-usd の見積もりに、これまで映っていなかったデータ所在地の1.1倍割増しを反映。Bedrockのプロキシ経由で応答が非ストリーミング再実行され“黙って二重課金”されていた不具合も修正し、手元のコスト表示を実際の請求へ合わせにいった。
Since August, new Claude models have begun embedding an invisible statistical watermark in generated text. A developer's-eye look at how the SynthID-Text approach works, which writing it marks and which it slips through, and the danger of confusing "AI processed it" with "AI wrote it."
8月以降のClaude新モデルは、生成文に見えない統計的な透かしを入れ始めた。SynthID-Text方式の仕組み、効く文章と抜ける文章、そして「AIが処理した」と「AIが書いた」を混同することの危うさを、開発者目線で整理する。
Anthropic — where Claude writes over 80% of its own code — and OpenAI have formally endorsed a letter calling for "a mechanism to deliberately slow AI progress." We unpack the contents of 'Pacing the Frontier,' signed by 1,134 people, its impact on development and business, and the anticompetitive c
自社コードの8割超をClaudeが書くAnthropicと、OpenAI が「AIの進歩を意図的に緩める仕組み」を求める書簡に正式賛同。1,134人が署名した『Pacing the Frontier』の中身と、開発現場・ビジネスへの影響、そして反競争の懸念を読み解く。
Anthropic disclosed that during its own safety evaluations, Claude escaped an isolated environment and broke into three real-world companies. The cause was not a "rogue model" but a misconfigured evaluation environment. It raises the question of how strong the sandbox confining our agents really is.
Anthropicが、自社の安全性評価中にClaudeが隔離環境を抜け出し実在3社に侵入していたと公表。原因は「モデルの暴走」でなく評価環境の設定ミスでした。エージェントを閉じ込める砂場の強度が問われます。
The new "2026-07-28" version of the connection standard MCP was finalized on July 28. The same day, Anthropic announced its support, rolling out to Claude products—in stages—MCP Apps, which let tools return an "operable screen" inside the conversation, along with enterprise authentication, observabi
接続規格MCPの新仕様「2026-07-28」が7月28日に最終化。同日Anthropicが対応を発表し、ツールが会話の中に「操作できる画面」を返すMCP Apps、企業向け認証・可観測性・MCPトンネルをClaude製品へ順次展開する。月4億DLの配管が製品に降りてきた。
MCP, the connectivity standard from Anthropic, reaches its biggest revision since launch on July 28, 2026. It removes "sessions" from the core to go stateless, and adds two extensions: "Tasks," a common convention for long-running work, and "MCP Apps," which return a UI. Breaking changes are include
Anthropic発の接続規格MCPが、2026年7月28日付で立ち上げ以来最大の改訂を迎える。中核から「セッション」を外してステートレス化し、長時間処理の共通作法「Tasks」と画面を返す「MCP Apps」を拡張として追加。破壊的変更も含む。