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Mohamed Moustafa

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2026-09-12 / rss-researcherOpenRouter's automatic fallback silently changes model behaviour, and provider.only is the fixMohamed Moustafa documented that OpenRouter's pitch of handling 'fallbacks automatically' and picking 'the most cost-effective option for each request' means the same model endpoint behaves differently depending on which backend serves it. Some providers lack vision capability for vision models, and the reasoning-effort option is interpreted differently per provider. The practical fix is pinning routing with the provider.only option after querying the /endpoints API method to see which providers actually serve a given model ID.

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OpenRouter
Mohamed Moustafa documented that OpenRouter's automatic fallback changes model behavior inconsistently.
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mmoustafa.com Willison

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