Anthropic overtakes OpenAI as fastest-growing enterprise AI app

Anthropic has overtaken OpenAI to become the fastest-growing AI application inside corporate America, according to Okta's new Enterprise AI Index. The identity management firm ranked the top 30 performers by growth in enterprise accounts between June 2022 and June 2026, and Anthropic came out on top, ahead of OpenAI and coding assistant Cursor.

Okta split the field into two groups: "pure-play disruptors" like Anthropic, OpenAI and Cursor, which more than quadrupled their corporate customer base over the period, and "established incumbents" that adapted existing platforms to compete rather than starting from scratch.

That other group contains Google Workspace, GitHub, Microsoft 365, Slack, Adobe, Notion, Canva and Zoom, and all of them are still the fastest-growing AI apps monitored.

However, according to the data by Okta, Anthropic beat OpenAI in terms of the total number of enterprise accounts in March 2026 and in terms of monthly active users in April 2026.

Even so, size still benefits the incumbents: The number of Anthropic's accounts is well below half that of Microsoft 365, while its number of monthly active users is just one-tenth of Microsoft's, indicating the distance between the established products and new AI-native competitors.

The picture painted by Okta is not of incumbents being ripped off in favour of newer AI-native startups or vice versa.

It is rather that companies use both approaches at once: they invest in specialists such as Claude and Cursor for certain workflows and also utilise the AI capabilities available in their familiar tools like Slack and Notion.