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Transcription models available - Question on gpt-4o-transcribe gpt-4o-mini-transcribe gpt-4o-transcribe-diarize

OpenAI Developer Community March 30, 2026
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Hi!

These models are not deprecated. I also did a quick test that I can use these models using the latest version of the OpenAi .Net library. The most likely explanations for the HTTP 403 ... Project ... does not have access to model ... error are:

  • the wrong API key is loaded at runtime
  • the key belongs to a different OpenAI project
  • an explicit OpenAI-Project header points to the wrong project

You can check the API keys, permissions and project access via the platform:

  • API keys
  • Permissions / project keys background

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