> For a complete documentation index, fetch https://docs.voximplant.ai/llms.txt

# DialogflowModelVariant

## Values

**`SPEECH_MODEL_VARIANT_UNSPECIFIED`** `'SPEECH_MODEL_VARIANT_UNSPECIFIED'`

No model variant specified. In this case Dialogflow defaults to USE\_BEST\_AVAILABLE.

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**`USE_BEST_AVAILABLE`** `'USE_BEST_AVAILABLE'`

Use the best available variant of the Speech model that the caller is eligible for.
Please see the Dialogflow docs for how to make your project eligible for enhanced models.

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**`USE_STANDARD`** `'USE_STANDARD'`

Use standard model variant even if an enhanced model is available. See the Cloud Speech documentation for details about enhanced models.

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**`USE_ENHANCED`** `'USE_ENHANCED'`

Use an enhanced model variant:

* If an enhanced variant does not exist for the given model and request language, Dialogflow falls back to the standard variant.
  The Cloud Speech documentation describes which models have enhanced variants.
* If the API caller is not eligible for enhanced models, Dialogflow returns an error. Please see the Dialogflow docs for how to make your project eligible.

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