See theCloud Speech
documentationfor which models have different variants. For example, the "phone_call" model
has both a standard and an enhanced variant. When you use an enhanced model,
you will generally receive higher quality results than for a standard model.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[],[],null,["# Google Cloud Dialogflow V2 Client - Class SpeechModelVariant (2.1.2)\n\nVersion latestkeyboard_arrow_down\n\n- [2.1.2 (latest)](/php/docs/reference/cloud-dialogflow/latest/V2.SpeechModelVariant)\n- [2.1.1](/php/docs/reference/cloud-dialogflow/2.1.1/V2.SpeechModelVariant)\n- [2.0.1](/php/docs/reference/cloud-dialogflow/2.0.1/V2.SpeechModelVariant)\n- [1.17.2](/php/docs/reference/cloud-dialogflow/1.17.2/V2.SpeechModelVariant)\n- [1.16.0](/php/docs/reference/cloud-dialogflow/1.16.0/V2.SpeechModelVariant)\n- [1.15.1](/php/docs/reference/cloud-dialogflow/1.15.1/V2.SpeechModelVariant)\n- [1.14.0](/php/docs/reference/cloud-dialogflow/1.14.0/V2.SpeechModelVariant)\n- [1.13.0](/php/docs/reference/cloud-dialogflow/1.13.0/V2.SpeechModelVariant)\n- [1.12.3](/php/docs/reference/cloud-dialogflow/1.12.3/V2.SpeechModelVariant)\n- [1.11.0](/php/docs/reference/cloud-dialogflow/1.11.0/V2.SpeechModelVariant)\n- [1.10.2](/php/docs/reference/cloud-dialogflow/1.10.2/V2.SpeechModelVariant)\n- [1.9.0](/php/docs/reference/cloud-dialogflow/1.9.0/V2.SpeechModelVariant)\n- [1.8.0](/php/docs/reference/cloud-dialogflow/1.8.0/V2.SpeechModelVariant)\n- [1.7.2](/php/docs/reference/cloud-dialogflow/1.7.2/V2.SpeechModelVariant)\n- [1.6.0](/php/docs/reference/cloud-dialogflow/1.6.0/V2.SpeechModelVariant)\n- [1.5.0](/php/docs/reference/cloud-dialogflow/1.5.0/V2.SpeechModelVariant)\n- [1.4.0](/php/docs/reference/cloud-dialogflow/1.4.0/V2.SpeechModelVariant)\n- [1.3.2](/php/docs/reference/cloud-dialogflow/1.3.2/V2.SpeechModelVariant)\n- [1.2.0](/php/docs/reference/cloud-dialogflow/1.2.0/V2.SpeechModelVariant)\n- [1.1.1](/php/docs/reference/cloud-dialogflow/1.1.1/V2.SpeechModelVariant)\n- [1.0.1](/php/docs/reference/cloud-dialogflow/1.0.1/V2.SpeechModelVariant) \nReference documentation and code samples for the Google Cloud Dialogflow V2 Client class SpeechModelVariant.\n\nVariant of the specified [Speech\nmodel](/php/docs/reference/cloud-dialogflow/latest/V2.InputAudioConfig#_Google_Cloud_Dialogflow_V2_InputAudioConfig__getModel__) to use.\n\nSee the [Cloud Speech\ndocumentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)\nfor which models have different variants. For example, the \"phone_call\" model\nhas both a standard and an enhanced variant. When you use an enhanced model,\nyou will generally receive higher quality results than for a standard model.\n\nProtobuf type `google.cloud.dialogflow.v2.SpeechModelVariant`\n\nNamespace\n---------\n\nGoogle \\\\ Cloud \\\\ Dialogflow \\\\ V2\n\nMethods\n-------\n\n### static::name\n\n### static::value\n\nConstants\n---------\n\n### SPEECH_MODEL_VARIANT_UNSPECIFIED\n\n Value: 0\n\nNo model variant specified. In this case Dialogflow defaults to\nUSE_BEST_AVAILABLE.\n\nGenerated from protobuf enum `SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;`\n\n### USE_BEST_AVAILABLE\n\n Value: 1\n\nUse the best available variant of the Speech model that the caller\nis eligible for.\n\nPlease see the [Dialogflow\ndocs](https://cloud.google.com/dialogflow/docs/data-logging) for\nhow to make your project eligible for enhanced models.\n\nGenerated from protobuf enum `USE_BEST_AVAILABLE = 1;`\n\n### USE_STANDARD\n\n Value: 2\n\nUse standard model variant even if an enhanced model is available. See the\n[Cloud Speech\ndocumentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)\nfor details about enhanced models.\n\nGenerated from protobuf enum `USE_STANDARD = 2;`\n\n### USE_ENHANCED\n\n Value: 3\n\nUse an enhanced model variant:\n\n- If an enhanced variant does not exist for the given [model](/php/docs/reference/cloud-dialogflow/latest/V2.InputAudioConfig#_Google_Cloud_Dialogflow_V2_InputAudioConfig__getModel__) and request language, Dialogflow falls back to the standard variant.\n\nThe [Cloud Speech\ndocumentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)\ndescribes which models have enhanced variants.\n\n- If the API caller isn't eligible for enhanced models, Dialogflow returns an error. Please see the [Dialogflow\n docs](https://cloud.google.com/dialogflow/docs/data-logging) for how to make your project eligible.\n\nGenerated from protobuf enum `USE_ENHANCED = 3;`"]]