Anthropic's US business adoption jumped to 30.6% in March from 24.4% in February, while OpenAI held steady at approximately 35%, according to Ramp data cited by the Financial Times.
Anthropic's rapid month-over-month growth marks a significant shift in enterprise AI tool adoption. The 6.2 percentage point increase in US business spending on Anthropic's offerings outpaced rival OpenAI, which saw negligible monthly movement.
The divergence reflects mounting enterprise interest in Anthropic's Claude Code products, which enable developers to write, test, and deploy software through AI-assisted workflows. This capability has resonated with businesses seeking practical AI applications beyond general-purpose chatbots.
While OpenAI maintains a higher absolute adoption rate at 35%, the momentum tilts toward Anthropic. The company has concentrated efforts on building products tailored to specific workflows, contrasting with OpenAI's broader platform approach.
Ramp's data, drawn from corporate spending patterns, provides a real-time snapshot of enterprise AI adoption trends. The metrics reflect actual purchasing decisions rather than trial signups or usage metrics, offering clearer insight into which vendors businesses commit resources to.
Anthropicdespite its later market entry relative to OpenAI has compressed the adoption gap significantly. The March figures suggest enterprise customers view Claude-powered tools as viable alternatives for production workloads.
The growth also aligns with Anthropic's recent messaging around enterprise reliability and safety. The company has emphasized Claude's ability to handle complex technical tasks with fewer hallucinations, addressing key concerns for businesses deploying AI in critical functions.
Both companies continue expanding their enterprise offerings. OpenAI's flat adoption rate may reflect market saturation among early adopters or businesses waiting for enhanced enterprise features. Anthropic's acceleration suggests it is capturing mindshare among the broader enterprise segment still evaluating AI vendors.
Further adoption trends will indicate whether Anthropic's growth trajectory continues or stabilizes, and whether it can close the remaining 4.4 percentage point gap with OpenAI among US businesses.
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