OpenAI overtakes Anthropic after 2.5 years, Astra ranks first in spending share

Beating AI News Flash: The latest OpenRouter data shows that last week users spent more on OpenAI models than on Anthropic. This is the first time since February 2024, breaking Anthropic's two-and-a-half-year lead.

The biggest shift came from Astra. A single model alone captured about 19% of combined OpenAI and Anthropic spending, surpassing Opus 5's 16% to become last week's top-grossing model. GPT-5.6 Sol and Luna each accounted for about 10%.

OpenAI's rebound had actually already begun. After Terra and Luna saw major price cuts this summer, usage on OpenRouter grew rapidly, and some users continued using them even after the discounts ended. After Astra launched, OpenAI ultimately pushed its spending share past 50%.

However, this only represents the relative spending between OpenAI and Anthropic on OpenRouter, and cannot be directly equated with the entire API market or the total revenue of the two companies.