OpenAI surpasses Anthropic in user spending for the first time in two and a half years

OpenRouter data indicates that user spending on OpenAI models exceeded that of Anthropic last week, marking the first time Anthropic has lost its lead since February 2024. The shift was driven by the Astra model, which captured approximately 19% of combined spending between the two companies. While OpenAI's share has grown following price reductions for Terra and Luna, this data reflects relative spending on OpenRouter and does not necessarily represent the entire API market or total company revenue.