Anthropic said no. OpenAI said yes. One weekend, one decision—and a masterclass in brand building

Here is a number worth sitting with: 295%. That’s how much U. S. app uninstalls of ChatGPT surged in a single day last month, after OpenAI struck a deal with the Department of Defense that its rival Anthropic had publicly refused to sign. In the same 24-hour window, Claude’s downloads jumped 51%. By that evening, Anthropic’s app had climbed to No. 1 on the U. App, leapfrogging 20 apps in under a week. One values-driven decision. One weekend. A measurable transfer of market share. Most of the coverage framed this as a political story. It isn’t. Or at least, not only.