Anthropic Just Passed OpenAI in Business Adoption. One Survey Says Don't Celebrate Yet.

The trajectory is the part that should make OpenAI uncomfortable. Anthropic went from 0.03 percent of tracked businesses in June 2023 to 7.94 percent in April 2025 to 34.44 percent in April 2026. It roughly quadrupled in a year. OpenAI, meanwhile, peaked near 36.5 percent in mid-2025 and has drifted down since. One curve is still climbing the steep part. The other has rolled over.

This lines up with everything else we know about Anthropic's enterprise tilt. It is the same company that, per its confidential S-1, hit a $47 billion revenue run-rate while approaching its first profitable quarter, mostly on the back of business customers rather than a consumer app.

What IDC found

Now the cold water. A March IDC survey measured something different and got a less flattering result for Anthropic. Only 19 percent of organizations reported extensive use of Claude. On depth-of-use metrics, Claude trailed both OpenAI and Google. A further 25 percent said they were still evaluating it.

Read quickly, the two reports look like a contradiction. They are not. They are answering different questions.

Ramp measures a binary: are you paying for this, yes or no. It captures the acquisition moment, the decision to swipe the card. IDC measures depth: once you are in the building, how much of the real work actually runs through you. A company can pay for Claude seats for a pilot team while ChatGPT remains wired into the workflows that have been there for two years. In Ramp's data that company counts as an Anthropic win. In IDC's, it barely registers.

Why both can be true at once

Put them together and you get a coherent picture instead of a paradox. Anthropic is winning the new-business race decisively. It is not yet winning the entrenchment race.

That distinction matters more than the crossed lines, because entrenchment is where the money and the durability live. Acquisition tells you who has momentum. Depth tells you who has a moat. Anthropic clearly has the first right now. The IDC numbers say the second is still up for grabs, and that ChatGPT's two-year head start inside existing workflows has not evaporated just because the new-signups chart flipped.

There is a consumer echo here too. We wrote in April about how Claude's consumer app was growing far faster than ChatGPT's off a smaller base, while ChatGPT held the enormous installed lead. Same shape, different arena: Anthropic owns the slope, OpenAI owns the base. The question in both cases is whether slope beats base before base defends itself.

What I would watch instead of the crossover

The crossover is a good headline and a weak metric, because a single month of binary adoption can wobble. Three things would tell you whether this is a genuine shift or a blip.

First, does Anthropic's depth-of-use number climb in the next IDC-style survey, not just its adoption number. Acquisition without deepening is churn waiting to happen. Second, does OpenAI's decline continue or stabilize. A peak followed by a plateau is very different from a peak followed by a slide. Third, watch renewal behavior on those pilot seats, because the company that converts evaluations into entrenched workflows wins the part of the market that actually pays the bills.

Anthropic passed OpenAI on the one chart that makes the cleanest headline. It has not yet passed it on the one that decides who runs enterprise AI in 2028. Both of those sentences are true today, and anyone selling you just one of them is selling you something.