US lifts restrictions on Anthropic’s Mythos 5 AI model

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Anthropic said on Tuesday it would restore global access to its most advanced AI models after the US government lifted export restrictions imposed earlier this month over national security concerns. The decision marks a reversal after the company worked with Washington to strengthen safeguards around the technology.

Anthropic said it would begin restoring access to the Fable on July 1.

The AI company was forced earlier this month to suspend access to its Fable 5 and Mythos 5 models for all foreign nationals Anthropic has said the US commerce department has lifted export controls on its Fable and Mythos AI models, less than ⁠three weeks after ⁠the company ​was ordered to suspend access to its most advanced AI models over national security risks. “We’ll begin restoring access tomorrow,” Anthropic said in a statement on X late on Tuesday. Continue reading...

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Anthropic has released Claude Sonnet 5, an update that is substantially improved over predecessor Claude Sonnet 4.6 in coding, reasoning, tool use, and knowledge work, according to the company. Claude Sonnet 5 was introduced June 30. It can make plans, use tools like browsers and terminals, and run autonomously at a level that required larger and more expensive models a few months ago, Anthropic said. Safety assessments found that Sonnet 5 shows an overall lower rate of undesirable behaviors than Sonnet 4.6 and is generally safer to use in agentic contexts, the company also noted. Claude Sonnet 5 is a drop-in upgrade for Claude Sonnet 4.6 with three behavior changes: adaptive thinking is on by default, manual extended thinking now returns a 400 error (it was deprecated on Claude Sonnet 4.6), and setting sampling parameters to non-default values also returns a 400 error. Further, Sonnet 5 uses an updated tokenizer that changes how the model processes text to improve performance. Anthro