The US Department of Commerce has lifted export controls on Anthropic’s Claude Fable 5 and Mythos 5, allowing the company to restore access to the models starting July 1. The announcement came alongside the launch of Claude Sonnet 5, Anthropic's latest AI model for coding, reasoning, and agentic tasks.
Anthropic said it had received notice that the Department of Commerce had lifted export controls on Claude Fable 5 and Mythos 5 after a two-week review.
“We’ll begin restoring access tomorrow and will share an update soon,” the company said in a post on X. “We’re grateful to our users for their patience and to everyone who worked with us on redeploying the models.”
US Commerce Secretary Howard Lutnick said the government had worked with Anthropic before approving the model.
“Over the past two weeks, we have worked closely with Anthropic to analyse and approve Fable 5 to ensure alignment across the US Government and strengthen America’s leadership in AI,” Lutnick said in a post on X.
Anthropic said Claude Fable 5 will be available globally from July 1 across the Claude Platform, Claude.ai, Claude Code, and Claude Cowork. Pro, Max, Team, and select Enterprise subscribers will be able to use the model for up to 50% of their weekly usage limits through July 7, after which it will be available through usage credits. The company added that access on AWS, Google Cloud, and Microsoft Foundry will be restored as soon as possible.
The company also said it has restored access to Claude Mythos 5 for a group of US organisations after receiving approval from the US government on June 26, and is working with authorities to expand access to additional domestic and international partners participating in its Glasswing program.
Anthropic released Claude Fable 5 and Claude Mythos 5 on June 9. On June 12, the US government imposed export controls on the models, requiring the company to restrict access for foreign nationals.
Meanwhile, Anthropic introduced Claude Sonnet 5, making it the default model for Free and Pro users and rolling it out across Max, Team, Enterprise, Claude Code and its API.
Sonnet 5 is available immediately through the Claude app, Claude Code and the Claude API.
The company said Sonnet 5 delivers improvements over Sonnet 4.6 in reasoning, coding, tool use and knowledge work, while narrowing the performance gap with Opus 4.8 at a lower price.
“For many developers, the agentic AI era began with Sonnet-class models,” Anthropic said. “Sonnet 5 narrows the gap: its performance is close to that of Opus 4.8, but at lower prices.”
The model is available at an introductory price of $2 per million input tokens and $10 per million output tokens until August 31. Eventually, pricing will increase to $3 per million input tokens and $15 per million output tokens.
Anthropic said Sonnet 5 supports different effort levels, allowing developers to balance cost and performance. At higher effort settings, the model can match Opus 4.8 on some agentic search and computer-use tasks while offering lower operating costs.
According to the company, early access users reported that Sonnet 5 completes more complex tasks, verifies its own outputs without explicit instructions and performs autonomous workflows more consistently than previous Sonnet models.
Anthropic also said its safety evaluations found that Sonnet 5 has lower rates of hallucinations, sycophancy and other undesirable behaviours than Sonnet 4.6. The company added that the model performs worse than Opus 4.8 and Mythos 5 on cybersecurity evaluations and was not specifically trained for offensive cyber tasks.
Because of improvements in general capability, Anthropic has enabled cyber safeguards by default on Sonnet 5. The safeguards are less restrictive than those used for Fable 5, which the company said block a wider range of cybersecurity tasks.
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