For the first time, more American businesses are paying for Anthropic's Claude than for OpenAI's ChatGPT. The crossover happened in April 2026, according to the Ramp AI Index, a monthly report from the corporate card and finance automation platform that tracks spending across over 50,000 U.S. companies.

Anthropic's business adoption rose 3.8% to 34.4% of firms. OpenAI's fell 2.9% to 32.3%. Overall AI adoption among businesses inched up 0.2 percentage points to 50.6%.

The reversal is the result of a yearlong surge by Anthropic. The company quadrupled its business adoption over the past year while OpenAI grew by just 0.3%.

How Anthropic Pulled Ahead

Anthropic's path to the top began with early adopters. Engineers and AI evangelists favored Claude for technical tasks. That base expanded rapidly as the company released Claude Code, an agentic coding tool. Ramp data shows Anthropic climbed from under 8% of businesses in early 2025 to over 34% in April 2026.

Claude Code became the fastest-growing product in Anthropic's history. One estimate found that 4% of all GitHub public commits were authored by Claude Code, double the share from a month earlier.

OpenAI, meanwhile, peaked near 36.5% in mid-2025 and has since declined. The company's consumer brand strength did not translate into sustained business growth.

Why This Matters

AI adoption in the workplace is reaching a tipping point. A separate Gallup survey found that half of employed American adults now use AI in their role at least a few times a year. Frequent use is growing, with 13% using AI daily.

The impact remains limited to individual tasks. Only about one in 10 employees in AI-adopting organizations strongly agree that AI has transformed how work gets done. CEOs across major economies report minimal broad productivity effects from AI over the past three years.

The Ramp data and Gallup survey together show a disconnect. AI spending is rising rapidly, but the promised organizational transformation has not arrived. For businesses, the question is whether tools like Claude Code will eventually deliver that change or if the current spending surge represents a speculative investment.

Threats to Anthropic's Lead

Anthropic's position may be fragile. The same Ramp report warns of escalating costs, compute constraints, and the token-based pricing model that has driven revenue growth. As Anthropic's customer base expands to larger enterprises, the company could face pressure to reduce costs or risk losing customers to competitors.

OpenAI is also not standing still. The company continues to release new capabilities and has deep financial resources from Microsoft. Other rivals such as Google's Gemini and open-source models could also erode Anthropic's lead.

The enterprise AI market remains fluid. No company has established a permanent advantage. Anthropic's lead today could vanish quickly if customers defect due to pricing or performance issues.

For now, Anthropic holds the top spot in business AI adoption. But maintaining that position will require navigating the same challenges that have tripped up every AI company to date.