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## Speech to Text API
This API transcribes speech to text in multiple Indian languages and English. Supports transcription for interactive applications.
### Available Options:
- **REST API** (Current Endpoint): For quick responses under 30 seconds with immediate results
- **Batch API**: For longer audio files, [Follow This Documentation](https://docs.sarvam.ai/api-reference-docs/api-guides-tutorials/speech-to-text/batch-api)
- Supports diarization (speaker identification)
### Note:
- Pricing differs for REST and Batch APIs
- Diarization is only available in Batch API with separate pricing
- Please refer to [here](https://docs.sarvam.ai/api-reference-docs/pricing) for detailed pricing information
Speech to Text API
This API transcribes speech to text in multiple Indian languages and English. Supports transcription for interactive applications.
Available Options:
REST API (Current Endpoint): For quick responses under 30 seconds with immediate results
Diarization is only available in Batch API with separate pricing
Please refer to here for detailed pricing information
Authentication
api-subscription-keystring
API Key authentication via header
Request
This endpoint expects a multipart form containing a file.
filefileRequired
The audio file to transcribe. Supported formats include WAV, MP3, AAC, AIFF, OGG, OPUS, FLAC, MP4/M4A, AMR, WMA, WebM, and PCM formats. The API automatically detects most codec formats, but for PCM files (pcm_s16le, pcm_l16, pcm_raw), you must specify the input_audio_codec parameter. PCM files are supported only at 16kHz sample rate.
The API works best with audio files sampled at 16kHz. If the audio contains multiple channels, they will be merged into a single channel.
modelenumOptional
Specifies the model to use for speech-to-text conversion.
- **saarika:v2.5** (default): Transcribes audio in the spoken language.
- **saaras:v3**: State-of-the-art model with flexible output formats. Supports multiple modes via the `mode` parameter: transcribe, translate, verbatim, translit, codemix.
Allowed values:
modeenum or nullOptionalDefaults to transcribe
Mode of operation. **Only applicable when using saaras:v3 model.**
Example audio: 'मेरा फोन नंबर है 9840950950'
- **transcribe** (default): Standard transcription in the original language with proper formatting and number normalization.
- Output: `मेरा फोन नंबर है 9840950950`
- **translate**: Translates speech from any supported Indic language to English.
- Output: `My phone number is 9840950950`
- **verbatim**: Exact word-for-word transcription without normalization, preserving filler words and spoken numbers as-is.
- Output: `मेरा फोन नंबर है नौ आठ चार zero नौ पांच zero नौ पांच zero`
- **translit**: Romanization - Transliterates speech to Latin/Roman script only.
- Output: `mera phone number hai 9840950950`
- **codemix**: Code-mixed text with English words in English and Indic words in native script.
- Output: `मेरा phone number है 9840950950`
Allowed values:
language_codeenumOptional
Specifies the language of the input audio in BCP-47 format.
**Note:** This parameter is optional for `saarika:v2.5` model.
**Available Options:**
- `unknown`: Use when the language is not known; the API will auto-detect.
- `hi-IN`: Hindi
- `bn-IN`: Bengali
- `kn-IN`: Kannada
- `ml-IN`: Malayalam
- `mr-IN`: Marathi
- `od-IN`: Odia
- `pa-IN`: Punjabi
- `ta-IN`: Tamil
- `te-IN`: Telugu
- `en-IN`: English
- `gu-IN`: Gujarati
**Additional Options (saaras:v3 only):**
- `as-IN`: Assamese
- `ur-IN`: Urdu
- `ne-IN`: Nepali
- `kok-IN`: Konkani
- `ks-IN`: Kashmiri
- `sd-IN`: Sindhi
- `sa-IN`: Sanskrit
- `sat-IN`: Santali
- `mni-IN`: Manipuri
- `brx-IN`: Bodo
- `mai-IN`: Maithili
- `doi-IN`: Dogri
input_audio_codecenumOptional
Input Audio codec/format of the input file. PCM files are supported only at 16kHz sample rate.
Response
Successful Response
request_idstring or null
transcriptstring
The transcribed text from the provided audio file.
language_codestring or null
This will return the BCP-47 code of language spoken in the input. If multiple languages are detected, this will return language code of most predominant spoken language. If no language is detected, this will be null
timestampsobject or null
Contains timestamps for the transcribed text. This field is included only if with_timestamps is set to true
diarized_transcriptobject or null
Diarized transcript of the provided speech
language_probabilitydouble or null
Float value (0.0 to 1.0) indicating the probability of the detected language being correct. Higher values indicate higher confidence.
When it returns a value:
When language_code is not provided in the request
When language_code is set to unknown
When it returns null:
When a specific language_code is provided (language detection is skipped)
The parameter is always present in the response.
Errors
400
Bad Request Error
403
Forbidden Error
422
Unprocessable Entity Error
429
Too Many Requests Error
500
Internal Server Error
503
Service Unavailable Error
The audio file to transcribe. Supported formats include WAV, MP3, AAC, AIFF, OGG, OPUS, FLAC, MP4/M4A, AMR, WMA, WebM, and PCM formats. The API automatically detects most codec formats, but for PCM files (pcm_s16le, pcm_l16, pcm_raw), you must specify the input_audio_codec parameter. PCM files are supported only at 16kHz sample rate.
The API works best with audio files sampled at 16kHz. If the audio contains multiple channels, they will be merged into a single channel.
Specifies the model to use for speech-to-text conversion.
saarika:v2.5 (default): Transcribes audio in the spoken language.
saaras:v3: State-of-the-art model with flexible output formats. Supports multiple modes via the mode parameter: transcribe, translate, verbatim, translit, codemix.
Mode of operation. Only applicable when using saaras:v3 model.
Example audio: ‘मेरा फोन नंबर है 9840950950’
transcribe (default): Standard transcription in the original language with proper formatting and number normalization.
Output: मेरा फोन नंबर है 9840950950
translate: Translates speech from any supported Indic language to English.
Output: My phone number is 9840950950
verbatim: Exact word-for-word transcription without normalization, preserving filler words and spoken numbers as-is.
Output: मेरा फोन नंबर है नौ आठ चार zero नौ पांच zero नौ पांच zero
translit: Romanization - Transliterates speech to Latin/Roman script only.
Output: mera phone number hai 9840950950
codemix: Code-mixed text with English words in English and Indic words in native script.
Output: मेरा phone number है 9840950950
Specifies the language of the input audio in BCP-47 format.
Note: This parameter is optional for saarika:v2.5 model.
Available Options:
unknown: Use when the language is not known; the API will auto-detect.
