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How to Handle Audio Transcription API 404/501 — available=false Speech-to-Text in 2026

Short answer: route production supplier-invoice audio to an external speech-to-text provider whenever the model catalog does not advertise an available ASR model, and record that routing decision…

  • 404, 501, or available=false status indicates unavailable ASR model
  • External speech-to-text provider recommended for production invoices
  • System implements ASR port with catalog check and tenant usage ledger