TLDR
- Claude became the #1 app on Apple’s U.S. App Store following Pentagon designation of Anthropic as a supply-chain security concern
- Pete Hegseth, Defense Secretary, initiated action to prevent defense contractors from utilizing Anthropic’s technology
- A Pentagon partnership with OpenAI was announced immediately after Anthropic’s blacklisting, sparking widespread #CancelChatGPT protests
- Free tier users at Anthropic expanded by more than 60% from January, with new daily registrations tripling from November levels
- Claude dominated App Store rankings across the U.S., Canada, and Germany, though Google Play has yet to reflect this shift
On Saturday, February 28, 2026, Anthropic’s Claude application claimed the top position on Apple’s U.S. App Store for the first time in its history. The milestone displaced OpenAI’s ChatGPT to second place, while Google’s Gemini fell to fourth.
This unprecedented climb followed escalating tensions between Anthropic and the U.S. Department of Defense. Defense Secretary Pete Hegseth formally requested that Anthropic receive designation as a national security supply-chain threat. Such classification would prohibit all U.S. defense contractors from incorporating Anthropic’s products into their operations.
The confrontation emerged when Anthropic declined to permit its artificial intelligence systems for large-scale domestic surveillance programs or weapons systems operating without human control. Company leadership announced plans to legally contest the security designation.
President Trump entered the debate Friday through Truth Social, stating that Anthropic committed a “disastrous mistake” by prioritizing its service terms above constitutional authority.
Dario Amodei, Anthropic’s CEO, issued a response expressing optimism that the Pentagon would reassess its position, citing the significant contributions the company’s technology makes to military operations.
Mere hours following Anthropic’s blacklisting, OpenAI revealed a partnership agreement with the Department of Defense for model deployment. Sam Altman, OpenAI’s CEO, explained the deal incorporates safeguards against domestic mass surveillance and mandates human decision-making for force applications.
The announcement’s timing ignited fierce opposition to OpenAI. Social media platforms witnessed the #CancelChatGPT hashtag gain momentum, while activists launched CancelChatGPT.com to guide users through account deletion procedures.
Katy Perry, the pop music icon, shared a screenshot displaying Claude’s Pro subscription interface on X, highlighting the $20 monthly tier with a red heart emoji. Numerous other users published their Anthropic payment confirmations paired with ChatGPT cancellation evidence.
Claude’s Growth Numbers
Anthropic reported that free user accounts increased beyond 60% from January onward. New account registrations per day have tripled compared to November figures, with the organization setting new daily records throughout that week. The subscriber base for paid tiers more than doubled during 2026.
Prior to February, Claude occupied position No. 131 on the U.S. App Store as of January 30. Throughout most of February, it ascended into the top 20 before capturing first place.
Claude achieved top rankings in Canadian and German markets as well. Switzerland saw it reach second position, while Austria maintained ChatGPT at number one. Android users on Google Play have not yet demonstrated this pattern, despite representing a substantial market segment.
Not Everyone Is Switching
User responses varied considerably. Several Reddit commenters indicated the Pentagon developments didn’t influence their AI model preferences. Additional critics highlighted that Anthropic maintains its own defense-related collaborations.
Anthropic established a partnership with Palantir and Amazon Web Services in November 2024. This arrangement provides U.S. intelligence and military agencies with Claude model access, generating comparable concerns to those facing OpenAI.
OpenAI released complete Pentagon contract documentation on Saturday. The terms explicitly forbid AI from autonomously managing weapons systems where human supervision is mandated by law. The agreement additionally prohibits unrestricted surveillance of American citizens’ private data.
Anthropic launched in 2021, founded by individuals who previously worked at OpenAI. ChatGPT maintains over 900 million users weekly.
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