According to OpenRouter data, OpenAI's share of the combined model spending by the two companies rose from about 20% in early June to slightly over 50% in the week ending September 7, marking the first time it has surpassed Anthropic since February 2024. (This statistic refers to the "wallet share" between OpenAI and Anthropic on the OpenRouter platform, measuring dollar spending rather than the number of calls, and does not represent the overall AI market share.)