OpenAI just ended Anthropic's 2.5-year run at the top of OpenRouter spend.
Last week (week of Sep 7) was the first time since Feb 2024 that OpenAI models pulled in more developer dollars than Claude on the platform, just over half of the combined two-lab total.
The part that actually matters: this is wallet-share, not token count. OpenRouter tracks what people really pay. Anthropic held 75–80% through most of 24–25 on premium pricing, so losing the dollar lead stings more than losing usage.
Astra alone took ~19% of all platform spend. OpenAI's wider lineup (Luna / Terra / Sol + Astra) finished it.
Meanwhile the open-weight camp kept swallowing the raw volume. US-model token share on OpenRouter dropped from ~70% to ~30% between mid-2025 and mid-2026, with DeepSeek and friends taking most of it.
So the routing layer now tells two stories at once: closed models win the revenue, open-weight wins the usage. If you build on a router, which side are you betting on?
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