Key Takeaways
- Claude by Anthropic claimed the #1 position on Apple’s U.S. App Store following Pentagon designation of Anthropic as a supply-chain security threat
- Pete Hegseth, Defense Secretary, initiated measures to prevent defense contractors from utilizing Anthropic’s technology
- A Pentagon partnership with OpenAI, announced immediately after Anthropic’s blacklisting, sparked the #CancelChatGPT boycott campaign
- Free Claude users surged more than 60% from January, with new daily registrations tripling compared to November figures
- The Claude app reached top positions in U.S., Canadian, and German App Stores, while Android’s Google Play has yet to reflect this shift
On Saturday, February 28, 2026, Anthropic’s Claude application secured the top ranking on Apple’s U.S. App Store for the first time. This milestone displaced OpenAI’s ChatGPT to second place, while Google’s Gemini fell to fourth position.
This dramatic ascent followed escalating tensions between Anthropic and the United States Department of Defense. Defense Secretary Pete Hegseth recommended designating Anthropic as a national security supply-chain threat. Such classification would prevent American defense contractors from implementing any of Anthropic’s technological solutions.
The controversy emerged when Anthropic declined to permit its artificial intelligence systems to support mass domestic surveillance operations or fully autonomous weapon systems. The organization announced its intention to legally contest the national security designation.
President Trump entered the debate Friday through Truth Social, stating that Anthropic committed a “disastrous mistake” by prioritizing its terms of service above what he characterized as constitutional authority.
Dario Amodei, Anthropic’s CEO, replied by expressing hope that the Pentagon would reassess its position, emphasizing the significant technological contributions his company provides to military operations.
Immediately following Anthropic’s blacklisting, OpenAI revealed a newly finalized partnership with the Department of Defense for model deployment. Sam Altman, OpenAI’s CEO, specified that the arrangement incorporates safeguards against domestic mass surveillance and mandates human supervision for use-of-force decisions.
The announcement’s timing ignited significant pushback against OpenAI. Social media platforms witnessed rapid spread of the #CancelChatGPT hashtag, while activists established CancelChatGPT.com to facilitate account deletions.
Katy Perry, the international pop icon, shared an image on X showing Claude’s Pro subscription offering, highlighting the $20 monthly plan with a red heart emoji. Numerous other users publicly displayed their Anthropic payment confirmations alongside ChatGPT account cancellation evidence.
Anthropic’s User Expansion
Anthropic reported that its free user base expanded by more than 60% since January’s start. New daily registrations have increased threefold compared to November levels, with the organization setting consecutive daily sign-up records throughout that week. Paid subscription numbers more than doubled during 2026.
Prior to February, Claude held the 131st position in the U.S. App Store on January 30. Throughout February, it steadily climbed into the top 20 before ultimately capturing first place.
Claude achieved top rankings in Canadian and German markets as well. Switzerland saw Claude reach second place, while Austria maintained ChatGPT at the summit. This momentum has not yet manifested on Google Play, where Android users constitute a more substantial market segment.
Resistance to the Migration
User responses varied significantly. Several Reddit contributors indicated the Pentagon developments didn’t influence their AI platform preferences. Additional observers highlighted that Anthropic maintains its own military-related collaborations.
Anthropic established a partnership with Palantir and Amazon Web Services during November 2024. This arrangement provides United States intelligence and defense agencies with Claude model access, generating comparable concerns to those raised about OpenAI.
OpenAI released complete Pentagon contract details on Saturday. The agreement explicitly forbids AI from autonomously controlling weaponized systems where human supervision is legally mandated. It additionally prohibits unrestricted surveillance of private data belonging to American citizens.
Former OpenAI personnel established Anthropic in 2021. ChatGPT presently serves more than 900 million weekly active users.
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