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This design choice establishes a control mechanism within the service architecture that constrains the scope of voice generation capabilities. The restriction reflects OpenAI's assessment of technical risks associated with unrestricted voice synthesis and determines which features are available across different service delivery channels.
Users of GPT-4o audio functionality are limited to accessing only the preset voice options that OpenAI has made available through the standard interface. The voice generation capability is not accessible via API integrations, which constrains integration options for applications that might otherwise incorporate voice synthesis.
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"We are taking a conservative approach with audio outputs, including voice. Currently, voice output is limited to a set of preset voices and is not available in the API. This is partly to prevent misuse of voice generation for impersonation or to create misleading content... Red teamers noted that GPT-4o's voice could be used to generate speech that sounds like a real person.— Excerpt from OpenAI's GPT-4o System Card (PDF)
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This design choice establishes a control mechanism within the service architecture that constrains the scope of voice generation capabilities. The restriction reflects OpenAI's assessment of technical risks associated with unrestricted voice synthesis and determines which features are available across different service delivery channels.
Users of GPT-4o audio functionality are limited to accessing only the preset voice options that OpenAI has made available through the standard interface. The voice generation capability is not accessible via API integrations, which constrains integration options for applications that might otherwise incorporate voice synthesis.
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