OpenRouter data shows GPT-6 Astra overtaking Anthropic models in share

Mehdi @MehdiCadeOriginally posted 2026.09.16

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🚨 OPENAI IS MAKING HISTORY. For the first time in 2.5 years, users are reportedly spending more on OpenAI models than Anthropic models. OpenRouter just published its user share stats for last week: >GPT-6 Astra — 19% share >Fable 5.1 — 6% share >Fable 5.1 launched Sep 1 >Astra launched Sep 3 Astra still pulled 3×+ the share despite launching 2 days later. That’s a massive gap. Astra appears to have taken off incredibly fast, while Fable 5.1 hasn’t seen the same level of usage. So what happened with Fable 5.1?