Claude Mythos 5が限定再開、対象は重要インフラの米国組織

"I have determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model," Commerce Secretary Howard Lutnick wrote to Anthropic’s chief compute officer Tom Brown on Friday, according to the missive seen by Semafor.／"Since June 12, we’ve been working closely with the US government to restore access to Claude Mythos 5 and Fable 5. Today, the government notified us that Mythos 5, our strongest cybersecurity model, can be redeployed to a set of US organizations that operate and defend critical infrastructure."／"We’re restoring access for these organizations quickly, and we’re continuing to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again." — 前半は記事本文、後半は同記事が引用したAnthropic公式Xの投稿より

"We have restored access to Mythos 5 for a set of US organizations, following the US government’s approval." — 製品ページ冒頭のお知らせ欄より

"It is now allowing Anthropic to make Mythos 5 available to more than 100 specific U.S. government agencies and companies, including allowing non-American employees at those organizations to access the model, both Semafor and Reuters report." — 記事本文より

"Using Claude Mythos 5.1 requires accepting a 30-day data retention policy for safety monitoring by default." — 製品ページ Data retention 節より

"The export control directive on June 12 came after the government became aware of a report in which Amazon researchers had found a method of bypassing Fable 5’s safeguards: prompting it so that it identified a number of software vulnerabilities. In one case, the model produced code demonstrating how the relevant vulnerability could be exploited."／"Mythos 5, which has fewer safeguards, was only released to a small number of trusted Project Glasswing partners for use in defensive cybersecurity." — Timeline and safeguard updates 節より

"The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees." — 声明冒頭より

"Our testing confirmed that many less capable models—including Claude Opus 4.8, GPT-5.5, and Kimi K2.7—could identify the same vulnerabilities as Fable 5 did in the report."／"The new classifier also comes at the cost of flagging benign requests more often during routine coding and debugging tasks." — Timeline and safeguard updates 節より

"As of today, June 30, the export controls on Fable 5 and Mythos 5 have been lifted ."／"Because the order took effect immediately and we had no reliable way to verify nationality in real-time, we suspended access to both models for all users."／"Fable 5 will be available starting tomorrow, Wednesday, July 1, to users globally on the Claude Platform, Claude.ai, Claude Code, and Claude Cowork." — 冒頭の Update 節より

"Because Mythos 5.1 is highly capable for cybersecurity and biology research, it could be used both for good and for harm. We currently only provide access to a small, but growing, set of vetted organizations through our trusted access programs." — 製品ページ Safeguards 節より

"Claude Security uses Mythos 5 to scan code you own, and returns detailed findings rather than raw outputs without exposing the model itself. This means defenders can access the capabilities of Claude Mythos 5 without the model becoming accessible to those who might misuse it."／"From claude.ai/security , users can select a repository to scan using Claude Mythos 5. Claude then scans the codebase for vulnerabilities, and returns each finding with a CWE (Common Weakness Enumeration) category, confidence and severity ratings"／"Instead, they work through a purpose-built interface that runs Mythos in the background for a defined task and only receive the specific artifact the product is intended to provide."／"This output would be generated by Mythos, but the user would not have a way to prompt the model to, say, develop an exploit for a vulnerability."／"We’re working with our cybersecurity technology and services partners to integrate Claude Mythos 5 into the products and services defenders already use" — Making Claude Security available with Claude Mythos 5 for Enterprise customers 節ほかより

"we’re extending the partnership to approximately 150 new organizations. Each one will need to meet our security requirements before they gain access."／"The organizations in this new group are based in more than 15 countries, and most provide critical infrastructure to many more."／"The group covers several industries that weren’t well represented in our initial cohort, such as power, water, healthcare, communications, and hardware." — 冒頭より

"To date, our Cyber Verification Program has provided organizations with access to dual-use capabilities when using Claude Opus and Sonnet models."／"Over the coming weeks, we are evolving the program to expand safeguarded access to Claude Mythos."／"Our new Defender Advantage Fund (0xDAF) builds on that work with $35 million in Claude credits for organizations helping open-source maintainers secure their software." — Expanding our Cyber Verification Program 節より