Business adoption: Anthropic passes OpenAI in April 2026

Ramp AI Index showing Anthropic at 34.4% and OpenAI at 32.3% of U.S. business AI subscriptions in April 2026
Source: Ramp AI Index — share of U.S. businesses with paid AI subscriptions.

Benchmark leadership: OpenAI still on top

Artificial Analysis Intelligence Index v4.0 ranking GPT-5.5 first at 60, Claude Opus 4.7 and Gemini 3.1 Pro Preview tied at 57
Source: Artificial Analysis Intelligence Index v4.0 — 10 evaluations across 28 leading models.