ChatGPT reclaimed the top spot on the U.S. App Store after a brief Claude takeover linked to OpenAI’s contentious U.S. Department of Defense contract. The shift followed backlash over OpenAI’s decision to accept terms that Anthropic, its rival, rejected. Anthropic’s refusal to sign the contract—citing unmet safeguards—led to OpenAI securing the deal instead. User anger over ChatGPT’s ties to the Pentagon caused a 295% surge in uninstalls, temporarily boosting Claude to the App Store’s apex on March 1st.

The controversy underscored growing scrutiny of AI firms’ government ties. While OpenAI claimed to have secured Anthropic’s desired safeguards, the fallout damaged trust. Apptopia data revealed ChatGPT’s U.S. user share plummeted from 69.1% in January 2025 to 45.3% by January 2026, as Google Gemini grew from 14.7% to 25.1%. Sensor Tower noted Gemini’s 30% MAU spike between August and November, outpacing ChatGPT’s 5% growth. Meanwhile, Anthropic—prioritizing enterprise markets and ethical AI positioning—gained traction post-Super Bowl ads, cracking the U.S. Top 10 on February 13th.

Anthropic is now suing to overturn its “supply chain risk” designation, with over 30 industry experts backing its amicus brief. The case highlights tensions between corporate AI strategies and public accountability. Despite ChatGPT’s return to dominance, the rivalry with Claude and Gemini reflects a fractured LLM market, where user trust and ethical stances increasingly shape competitiveness.

The LLM war intensifies as ChatGPT’s 900 million weekly active users face pressure from Gemini’s 750 million monthly active users and Claude’s rising profile. OpenAI’s legal battle and Anthropic’s defiance signal a pivotal moment for AI’s role in national security—and consumer choice. The outcome could redefine how tech giants balance profit, policy, and public perception.