OpenRouter: the share of business spending between OpenAI and Anthropic models was roughly even in September, vs. Anthropic commanding a 75% share in January
THE SO WHAT
Anthropic’s drop from 75% to parity on OpenRouter spend in nine months shows how quickly share can swing when price and performance move. If your stack is still hard-wired to a single model family, you’re leaving negotiation leverage and resilience on the table—prioritize abstraction layers and evals that make switching real, not theoretical.
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