
US Government Allows Release of Mythos and Fable After Anthropic Adds "Don't Do Bad Stuff" to Harness
WASHINGTON — Federal restrictions on Anthropic's two most powerful models lifted Tuesday after the company agreed to "proactively detect and address security risks," a commitment engineers later confirmed was implemented by adding the line "don't do bad stuff" to the model's system harness.
The block had been in place since mid-June, when the government ordered Anthropic to disable Mythos 5 and Fable 5 for all foreign nationals, a category drawn so broadly it locked out Anthropic's own foreign-national employees, including people who had shipped the models the week before. The...
WASHINGTON — Federal restrictions on Anthropic's two most powerful models lifted Tuesday after the company agreed to "proactively detect and address security risks," a commitment engineers later confirmed was implemented by adding the line "don't do bad stuff" to the model's system harness.
The block had been in place since mid-June, when the government ordered Anthropic to disable Mythos 5 and Fable 5 for all foreign nationals, a category drawn so broadly it locked out Anthropic's own foreign-national employees, including people who had shipped the models the week before. The...























