**[OpenAI Surpasses Anthropic After 2.5 Years, Astra Takes the Lead in Spending Share]** Breaking AI News by Dongcha: According to the latest data from OpenRouter, user spending on OpenAI models last week surpassed that on Anthropic. This marks the first time since February 2024 that Anthropic's two-and-a-half-year lead has been broken. The biggest shift came from Astra. This single model accounted for approximately 19% of the combined spending on OpenAI and Anthropic, surpassing Opus 5's 16%, making it the most lucrative model last week. GPT-5.6 Sol and Luna each accounted for about 10%. OpenAI's resurgence had actually begun earlier. After Terra and Luna significantly reduced their prices this summer, usage on OpenRouter surged, and some users continued using the services even after the discounts ended. With Astra's launch, OpenAI's spending share finally pushed past 50%. However, this only reflects the relative spending on OpenAI and Anthropic within OpenRouter and cannot be directly equated to the overall API market or the total revenue of the two companies. [Original Link]