Mythos 5

In June 2026, the U.S. government ordered Anthropic to restrict access to its AI models Fable 5 and Mythos 5, leading to an 18-day global shutdown. The Commerce Department required a license for foreign access, prompting the company to halt access entirely until June 30. The article highlights a lack of standardized processes for evaluating AI security risks and implementing proportionate remedies.

Claude’s developers paused the release of Anthropic’s Mythos 5 due to cyber risks, leading to the Project Glasswing collaboration to provide controlled access for defenders. The U.S. government later forced Anthropic to remove Mythos 5 and its safeguarded version, Fable 5, which the company disputed as a narrow jailbreak. Challenges like lack of standard processes and information-sharing obstacles created a disorganized response to AI threats.

Microsoft President Brad Smith criticized the Trump administration's AI policy for lacking transparency and clear rules, citing recent restrictions on advanced AI models from Anthropic and OpenAI as examples. The administration used export controls to limit access to Fable 5, Mythos 5, and GPT-5.6, but these actions have since eased, with Smith noting the government lacks adequate tools to regulate frontier AI effectively.

Anthropic's Mythos 5 and Fable 5 AI models are back online after the company had productive conversations with the US government. Kevin Warsh made his first public appearance as Federal Reserve chairman, and Meta's shares rose following news of a new cloud business initiative.

The Trump administration has lifted restrictions on Anthropic's Claude Fable 5 and Mythos 5 AI models after cybersecurity concerns raised by Amazon's researchers. Anthropic now offers Fable 5 widely and limited access to Mythos 5 for approved U.S. organizations, while OpenAI restricts its new GPT-5.6 Sol model at the administration's request.

The Trump administration has lifted restrictions on Anthropic's Claude Fable 5 and Mythos 5 AI models after cybersecurity concerns led to a temporary ban. Anthropic now offers Fable 5 widely and Mythos 5 to U.S.-approved organizations, while OpenAI restricts its GPT-5.6 Sol model at the administration's request. President Trump's executive order on AI oversight requires vetting advanced systems before public release.

The Trump administration has removed restrictions on Anthropic's Claude Fable 5 AI model and partially restored access to Mythos 5, following cybersecurity concerns raised by Amazon researchers. OpenAI also restricted its new GPT-5.6 Sol model at the administration's request, as part of a new AI oversight framework.

The US has lifted restrictions on Anthropic's advanced AI models, including Claude Fable 5 and Mythos 5, which were previously restricted due to national security concerns. OpenAI was also instructed to limit the rollout of its GPT-5.6 model to vetted partners.

Anthropic is restoring Claude Fable 5 globally after the U.S. Commerce Department lifted export controls on June 30. The controls had been imposed two and a half weeks earlier, and Fable 5 will return to users on July 1 across multiple platforms.

The US Commerce Department lifted export controls on Anthropic's Fable 5 and Mythos 5 AI models after the company suspended access to them over national security risks. Anthropic agreed to collaborate with the US government on security protocols and monitoring, while the government retains the right to re-impose restrictions if circumstances change. The decision aligns with broader US scrutiny of advanced AI models amid concerns about potential misuse by foreign entities.

The US has lifted restrictions on AI models Fable 5 and Mythos 5, allowing AI firm Anthropic to restore access after removing export controls.

The US commerce department has lifted export controls on Anthropic's Fable and Mythos AI models, allowing the company to resume access to its Fable 5 and Mythos 5 models for foreign nationals after a three-week suspension due to national security concerns.

Anthropic claims the federal government removed restrictions on its Claude Fable 5 and Mythos 5 AI models, ending a weekslong dispute. The Trump administration is cited as the entity that lifted the restrictions.

Anthropic has confirmed that the Department of Commerce has lifted export controls on Claude's two most powerful models, Fable 5 and Mythos 5, leading to the restoration of Claude Fable access on Wednesday.

The U.S. Department of Commerce has removed export controls on Anthropic's Fable 5 and Mythos 5 models. This decision allows these AI models to be exported without prior restrictions.

Anthropic has reached an agreement with the Trump administration to restore access to its Fable 5 model after export controls were lifted by the Department of Commerce. The company plans to begin restoring access to Fable 5 and Mythos 5 tomorrow, expressing gratitude to users and collaborators.

Anthropic announced the restoration of access to its Fable 5 and Mythos 5 AI models after the Department of Commerce lifted export controls. The Trump administration had previously imposed restrictions requiring Anthropic to suspend access for foreign users, leading to a dispute that prompted company officials to negotiate in Washington D.C.

A Senate draft bill proposed by Sen. Mark Warner aims to establish a federally vetted list of AI agent providers to ensure security and accountability on online platforms. The AI AGENT Act would require the FTC to certify providers that meet privacy and data security standards, link AI agents to human operators, and allow users to control permissions. The bill seeks to address risks like unreliable AI purchases and data leaks as agentic AI becomes more prevalent.

The US government has approved Anthropic's Mythos 5 AI for use by 'trusted' US organizations following a two-week ban. The decision allows the release of the powerful AI model after a temporary restriction.

Anthropic PBC received U.S. government approval to restore access to its Mythos 5 AI model for certain trusted partners after addressing national security concerns. The decision resolves a recent dispute over foreign access restrictions and potential 'jailbreak' risks, though Fable 5 remains under restrictions.

Anthropic partially restored access to its AI model Mythos 5 for certain US organizations under US government restrictions, while Fable 5 remains restricted. The US government allowed limited access to Mythos 5 for entities defending critical infrastructure, following a two-week export-control order that initially blocked foreign access to both models.

The Trump administration is nearing an agreement to restore access to Anthropic's Fable 5 model after a 15-day suspension due to security concerns. Anthropic expects to reintroduce Fable 5 soon following government risk assessments, with the Commerce Department also allowing limited access to its cybersecurity model Mythos 5 for trusted users.

The Trump administration partially rescinded its export ban on Anthropic’s Mythos 5 AI model, allowing access to over 100 companies and agencies, while its Fable 5 model remains blocked. The decision follows concerns about potential cyberattack risks, with ongoing discussions to establish a standardized framework for evaluating security risks in AI models.

The U.S. government has approved Anthropic's limited re-release of Mythos 5. U.S. Commerce Secretary Howard Lutnick was in the Oval Office in June.

The Trump administration has authorized over 100 companies and government agencies to use Anthropic's Mythos 5, including their non-American employees. The model is now accessible to a broad range of U.S.-based organizations.

OpenAI and Anthropic have restricted new AI models to customers approved by President Donald Trump’s administration during a cybersecurity review. OpenAI’s GPT-5.6 Sol and Anthropic’s Mythos 5 are limited to small groups of trusted partners, following government concerns about potential cyber risks from advanced AI systems.

Anthropic's Mythos 5 has resumed operations for select organizations after a two-week negotiation with the Trump administration, while the public-facing Fable 5 remains delayed. A government letter dated June 26th confirmed the revised license terms for Mythos 5 but provided no timeline for Fable 5's approval.

The United States has lifted its block on Mythos 5. The article, which was shared on Twitter, has 18 points and 5 comments on Hacker News.

OpenAI is restricting the release of its new AI model, GPT-5.6 Sol, to a small group of Trump administration-approved partners during a cybersecurity review. The White House is collaborating with AI labs to address risks, following similar actions against Anthropic, which removed two models after a Trump directive. OpenAI described the testing period as temporary.

OpenAI is restricting the release of its new AI model GPT-5.6 Sol to a small group of Trump administration-approved partners during a cybersecurity review. The decision follows a Trump executive order requiring vetting of advanced AI systems for national security risks, with OpenAI stating the phased release is temporary. Anthropic recently removed two AI models in response to similar Trump directives.

OpenAI has restricted the release of its new AI model GPT-5.6 Sol to a small group of Trump administration-approved partners during a cybersecurity review. The decision follows a Trump executive order requiring government vetting of advanced AI systems for national security risks.

The Trump administration has reportedly asked OpenAI to limit the rollout of its GPT-5.6 model. This follows the administration's previous move to restrict access to Anthropic's Fable 5 and Mythos 5 AI models.

AI startup Legion sued the US government after losing access to Anthropic's Fable 5 and Mythos 5 models due to a government directive restricting foreign nationals. Anthropic complied with the order, initially disabling access for all users before restoring it with nationality-based controls. Legion claims the directive caused immediate and existential harm to its business.

Anthropic's Mythos model identified vulnerabilities in classified US government systems during a testing exercise with intelligence agencies via Project Glasswing. Senator Mark Warner cited the model's rapid detection capabilities, while tensions with the Trump administration led to restrictions on its AI models.

The N.S.A. lost access to Anthropic's Mythos 5 AI model due to a dispute, and Defense Secretary Pete Hegseth has labeled Anthropic a supply chain risk.

An international alliance of intelligence agencies, including the Five Eyes grouping (US, UK, Canada, Australia, New Zealand), warned that AI models capable of major cyberattacks could breach government and business defenses within months. The warning follows the Trump administration's order for Anthropic to suspend use of its advanced AI models by foreign nationals, highlighting concerns over emerging AI threats.

The Trump administration issued a de facto ban on Anthropic's Fable 5 and Mythos 5 models, citing national security concerns. Anthropic complied by making the models inaccessible to all users, including employees. The situation involves Amazon's potential role and criticism from a cybersecurity expert.

The White House and Anthropic are collaborating on a framework to assess AI security flaws, particularly for Anthropic's Fable 5 and Mythos 5 models, which face export controls due to a perceived jailbreak vulnerability. The effort aims to establish benchmarks for evaluating security risks in AI models, reflecting ongoing negotiations to address disagreements over the severity of the flaw.

French President Emmanuel Macron urged the U.S. to share cutting-edge AI and called for international cooperation among democracies to regulate advanced artificial intelligence systems. The discussion, involving AI executives and G7 leaders, highlighted tensions over the Trump administration's directive restricting access to Anthropic’s latest AI models by foreign nationals, which Macron criticized as a 'strictly nationalist' reaction.

French President Emmanuel Macron urged the US and other democracies to collaborate on regulating advanced AI systems, criticizing the Trump administration's nationalist approach to restricting Anthropic's models. G7 leaders and AI executives, including OpenAI's Sam Altman, discussed the need for international cooperation to establish AI safety standards and prevent authoritarian access to the technology.