It is judgment day for mathematics

Businesses such as OpenRouter are thriving as companies try to cut token costs

Should they fight upstart labs, or co-operate with them?

Efforts to reinforce cyber-security are not keeping pace with threats

Courts may take years to sort out legal standards for frontier firms

The president’s desire to unleash the technology is running into political reality

Do not let it rip

Payment cards linked to cryptocurrency accounts may enable Chinese purchases of American AI models

Even with higher growth, taxes may be harder to find

Privacy, employee data and the demands of AI

And how the 21st century’s most important social movement might yet end it

As Anthropic and its ilk join the donor class, they must avoid old pitfalls

Governments and voters elsewhere should be watching

The Americans want a hotline but the Chinese have been cool in the past

The movement is admirable, but dangerous

Readers have come to delight in the murder-solving expl…

The ad, which ethics experts said could violate federal law, shows Mr. Trump vowing to “expel the warmongers” from the government and fight the “deep state,” even as he wages a war with Iran.