Anthropic overtakes OpenAI in enterprise AI as Altman declares 'code red'

For the first time since ChatGPT touched off the generative-AI boom, more U.S. businesses are paying for Anthropic's Claude than for OpenAI's ChatGPT. Anthropic's share of corporate AI spend hit 34.4% in April, edging past OpenAI's 32.3%, according to Ramp's AI Index, which tracks card and invoice activity across more than 50,000 U.S. companies.venturebeat +1 OpenAI's share fell 2.9 points over the month, while Anthropic has quadrupled its corporate adoption in a year — and OpenAI CEO Sam Altman has responded by putting his company on a "code red" footing.venturebeat +1

A reversal driven by Claude Code

The flip is largely the work of a single product. Claude Code, Anthropic's agentic coding tool, hit a $1 billion annualized run rate within six months of its mid-2025 launch and was generating more than $2.5 billion by February 2026, making it the fastest-growing product in Anthropic's history.venturebeat Recent analysis estimated that 4% of all public GitHub commits worldwide were being authored by Claude Code — double the share a month earlier.venturebeat Anthropic's November launch of Claude Opus 4.5, pitched as the best model in the world for coding and agents, cemented the franchise.cnbc

The pull on revenue has been violent. Anthropic crossed a $30 billion annualized run rate in April, up from roughly $9 billion at the end of 2025, after CEO Dario Amodei said the company saw "80x growth per year in revenue and usage" when it had planned for 10x.venturebeat Over 1,000 enterprises now spend more than $1 million a year on Claude services, a figure that has doubled since February.venturebeat

OpenAI's 'code red' and structural counterweights

Altman's late-November memo to staff ordered a pullback from health, shopping and advertising bets to refocus on ChatGPT itself, after Google's Gemini 3 launch and Anthropic's enterprise surge rattled the company.cnbc OpenAI is hardly cornered: ChatGPT reached roughly 900 million weekly active users by March 2026, enterprise revenue is on track to hit parity with consumer by year-end, and a $122 billion round closed in March at an $852 billion valuation gives it firepower to compete on price and capacity.venturebeat An internal investor memo also argued OpenAI ran 1.9 GW of compute in 2025 versus Anthropic's 1.4 GW — a lead it intends to extend.qz

A fragile lead in the most volatile software market ever

Anthropic's win comes with asterisks. The company is rationing capacity, struck a 300-megawatt deal with Elon Musk's SpaceX to tap the Colossus 1 data center in Memphis, and is in talks to raise fresh capital at a valuation approaching $900 billion ahead of a possible October IPO.venturebeat Uber burned through its entire 2026 AI budget in four months, mostly on Claude Code and Cursor — a warning sign that token-based pricing could push price-sensitive buyers toward OpenAI's cheaper Codex or open-source inference platforms.venturebeat Ramp economist Ara Kharazian put it bluntly: "We have never seen a software industry as dynamic, where newcomers can disrupt market leaders in a matter of months."businessinsider