OpenRouter’s latest data shows that user spending on OpenAI models exceeded spending on Anthropic last week, marking the first time this has happened since February 2024. That shift ended Anthropic’s two-and-a-half-year lead on the platform. The biggest change came from Astra, whose model captured about 19% of combined spending across OpenAI and Anthropic models, ahead of Opus 5 at 16%. GPT-5.6 Sol and Luna each accounted for roughly 10%.
The rebound in OpenAI’s share did not start last week alone. According to the data cited by ChainCatcher, usage on OpenRouter climbed quickly after Terra and Luna saw major price cuts this summer, and some users kept using the models even after the discounts ended. After Astra launched, OpenAI’s spending share eventually moved above 50%.
OpenRouter’s figures only reflect relative spending between OpenAI and Anthropic on its own platform. The data should not be treated as a direct measure of the broader API market or either company’s total revenue.
OpenRouter’s latest data shows that user spending on OpenAI models exceeded Anthropic last week. It was the first time since February 2024 that OpenAI moved ahead, ending Anthropic’s two-and-a-half-year lead on the platform.
Spending mix shifted last week
The biggest change came from Astra. One of its models took about 19% of combined spending across OpenAI and Anthropic, topping Opus 5 at 16% and becoming the highest-spending model of the week. GPT-5.6 Sol and Luna each made up about 10%.
OpenAI’s recovery had already started
The rebound in OpenAI’s share had been building earlier. This summer, Terra and Luna posted steep price cuts, and usage on OpenRouter rose quickly. Some users continued to use the models after the promotional pricing ended. After Astra launched, OpenAI eventually pushed its spending share above 50%.
What the data does and does not show
Even so, the figures only represent relative spending between OpenAI and Anthropic on OpenRouter. They do not directly reflect the overall API market or the total revenue of either company.
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