# Realtime

GET /v1/speech-to-text/realtime

Realtime speech-to-text transcription service. This WebSocket API enables streaming audio input and receiving transcription results.

## Event Flow

- Audio chunks are sent as `input_audio_chunk` messages
- Transcription results are streamed back as `partial_transcript` (interim) and `committed_transcript` (stable/final for that segment)
- Supports manual commit or VAD-based automatic commit strategies

Authentication is done either by providing a valid API key in the `xi-api-key` header or by providing a valid token in the `token` query parameter. Tokens can be generated from the [single use token endpoint](https://elevenlabs.io/docs/api-reference/tokens/create). Use tokens if you want to transcribe audio from the client side.

Reference: https://elevenlabs.io/docs/api-reference/speech-to-text/v-1-speech-to-text-realtime

## AsyncAPI Specification

```yaml
asyncapi: 2.6.0
info:
  title: V 1 Speech To Text Realtime
  version: subpackage_v1SpeechToTextRealtime.v1SpeechToTextRealtime
  description: >
    Realtime speech-to-text transcription service. This WebSocket API enables
    streaming audio input and receiving transcription results.

    ## Event Flow

    - Audio chunks are sent as `input_audio_chunk` messages

    - Transcription results are streamed back as `partial_transcript` (interim)
    and `committed_transcript` (stable/final for that segment)

    - Supports manual commit or VAD-based automatic commit strategies

    Authentication is done either by providing a valid API key in the
    `xi-api-key` header or by providing a valid token in the `token` query
    parameter. Tokens can be generated from the [single use token
    endpoint](/docs/api-reference/tokens/create). Use tokens if you want to
    transcribe audio from the client side.
channels:
  /v1/speech-to-text/realtime:
    description: >
      Realtime speech-to-text transcription service. This WebSocket API enables
      streaming audio input and receiving transcription results.

      ## Event Flow

      - Audio chunks are sent as `input_audio_chunk` messages

      - Transcription results are streamed back as `partial_transcript`
      (interim) and `committed_transcript` (stable/final for that segment)

      - Supports manual commit or VAD-based automatic commit strategies

      Authentication is done either by providing a valid API key in the
      `xi-api-key` header or by providing a valid token in the `token` query
      parameter. Tokens can be generated from the [single use token
      endpoint](/docs/api-reference/tokens/create). Use tokens if you want to
      transcribe audio from the client side.
    bindings:
      ws:
        query:
          type: object
          properties:
            model_id:
              $ref: '#/components/schemas/_v1_speech-to-text_realtime_model_id'
            token:
              type: string
            audio_format:
              description: Any type
            language_code:
              type: string
            secondary_languages:
              type: array
              items:
                type: string
            commit_strategy:
              $ref: '#/components/schemas/_v1_speech-to-text_realtime_commit_strategy'
            vad_threshold:
              type: number
              format: double
            vad_silence_threshold_secs:
              type: number
              format: double
            min_speech_duration_ms:
              type: integer
            min_silence_duration_ms:
              type: integer
            include_timestamps:
              type: boolean
              default: false
            include_language_detection:
              type: boolean
              default: false
            keyterms:
              type: array
              items:
                type: string
            no_verbatim:
              type: boolean
              default: false
            entity_detection:
              $ref: >-
                #/components/schemas/_v1_speech-to-text_realtime_entity_detection
            transcript_edit:
              type: string
            filter_background_audio:
              type: boolean
              default: false
            keepalive_interval_ms:
              type: integer
              minimum: 500
              maximum: 10000
            enable_logging:
              type: boolean
              default: true
        headers:
          type: object
          properties:
            xi-api-key:
              type: string
    publish:
      operationId: subpackage_v1SpeechToTextRealtime.v1SpeechToTextRealtime-publish
      summary: subscribe
      description: >-
        Defines the message types that can be received by the client from the
        server
      message:
        name: subscribe
        title: subscribe
        description: >-
          Defines the message types that can be received by the client from the
          server
        payload:
          $ref: '#/components/schemas/V1SpeechToTextRealtimeSubscribe'
    subscribe:
      operationId: subpackage_v1SpeechToTextRealtime.v1SpeechToTextRealtime-subscribe
      summary: publish
      description: Defines the message types that can be sent from client to server
      message:
        name: publish
        title: publish
        description: Defines the message types that can be sent from client to server
        payload:
          $ref: '#/components/schemas/V1SpeechToTextRealtimePublish'
servers:
  Production:
    url: wss://api.elevenlabs.io/
    protocol: wss
    x-default: true
  Production US:
    url: wss://api.us.elevenlabs.io/
    protocol: wss
  Production EU:
    url: wss://api.eu.residency.elevenlabs.io/
    protocol: wss
  Production India:
    url: wss://api.in.residency.elevenlabs.io/
    protocol: wss
  Production Singapore:
    url: wss://api.sg.residency.elevenlabs.io/
    protocol: wss
components:
  schemas:
    _v1_speech-to-text_realtime_model_id:
      type: string
      enum:
        - scribe_v2_realtime
      default: scribe_v2_realtime
      description: The ID of the model to use for speech-to-text transcription.
      title: /v1/speech-to-text/realtime_model_id
    _v1_speech-to-text_realtime_commit_strategy:
      type: string
      enum:
        - manual
        - vad
      description: >-
        Commit strategy for speech segmentation. 'manual' requires explicit
        commits, 'vad' automatically segments speech using silence detection.
      title: /v1/speech-to-text/realtime_commit_strategy
    _v1_speech-to-text_realtime_entity_detection:
      oneOf:
        - type: string
        - type: array
          items:
            type: string
      description: >-
        Detect entities on committed transcripts. Can be 'all', a single entity
        type or category, or a list of types/categories ('pii', 'phi', 'pci',
        'other', 'offensive_language'). When enabled, detected entities are
        delivered in a separate 'committed_transcript_entities' event with their
        text, type, and character positions.
      title: /v1/speech-to-text/realtime_entity_detection
    AudioFormatEnum:
      type: string
      enum:
        - pcm_8000
        - pcm_16000
        - pcm_22050
        - pcm_24000
        - pcm_44100
        - pcm_48000
        - ulaw_8000
      default: pcm_16000
      description: Audio encoding format for speech-to-text.
      title: AudioFormatEnum
    MessagesSessionStartedConfigCommitStrategy:
      type: string
      enum:
        - manual
        - vad
      description: Strategy for committing transcriptions.
      title: MessagesSessionStartedConfigCommitStrategy
    MessagesSessionStartedConfig:
      type: object
      properties:
        sample_rate:
          type: integer
          description: Sample rate of the audio in Hz.
        audio_format:
          $ref: '#/components/schemas/AudioFormatEnum'
          default: pcm_16000
        language_code:
          type: string
          description: Language code in ISO 639-1 or ISO 639-3 format.
        commit_strategy:
          $ref: '#/components/schemas/MessagesSessionStartedConfigCommitStrategy'
          description: Strategy for committing transcriptions.
        vad_silence_threshold_secs:
          type: number
          format: double
          description: Silence threshold in seconds.
        vad_threshold:
          type: number
          format: double
          description: Threshold for voice activity detection.
        min_speech_duration_ms:
          type: integer
          description: Minimum speech duration in milliseconds.
        min_silence_duration_ms:
          type: integer
          description: Minimum silence duration in milliseconds.
        model_id:
          type: string
          description: ID of the model to use for transcription.
        enable_logging:
          type: boolean
          description: >-
            When enable_logging is set to false zero retention mode will be used
            for the request. This will mean history features are unavailable for
            this request. Zero retention mode may only be used by enterprise
            customers.
        include_timestamps:
          type: boolean
          description: >-
            Whether the session will include word-level timestamps in the
            committed transcript.
        include_language_detection:
          type: boolean
          description: >-
            Whether the session will include language detection in the committed
            transcript.
        keyterms:
          type: array
          items:
            type: string
          description: List of keyterms the model is biased towards.
        no_verbatim:
          type: boolean
          description: >-
            Whether filler words and disfluencies are removed from the
            transcript.
      description: Configuration for the transcription session.
      title: MessagesSessionStartedConfig
    SessionStarted:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - session_started
          description: The message type identifier.
        session_id:
          type: string
          description: Unique identifier for the session.
        config:
          $ref: '#/components/schemas/MessagesSessionStartedConfig'
          description: Configuration for the transcription session.
      required:
        - message_type
        - session_id
        - config
      description: Payload sent when the transcription session is successfully started.
      title: SessionStarted
    PartialTranscript:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - partial_transcript
          description: The message type identifier.
        text:
          type: string
          description: Partial transcription text.
      required:
        - message_type
        - text
      description: Payload for partial transcription results that may change.
      title: PartialTranscript
    CommittedTranscript:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - committed_transcript
          description: The message type identifier.
        text:
          type: string
          description: Committed transcription text.
      required:
        - message_type
        - text
      description: Payload for committed transcription results.
      title: CommittedTranscript
    TranscriptionWordType:
      type: string
      enum:
        - word
        - spacing
      description: The type of word.
      title: TranscriptionWordType
    TranscriptionWord:
      type: object
      properties:
        text:
          type: string
          description: The transcribed word.
        start:
          type: number
          format: double
          description: Start time in seconds.
        end:
          type: number
          format: double
          description: End time in seconds.
        type:
          $ref: '#/components/schemas/TranscriptionWordType'
          description: The type of word.
        speaker_id:
          type: string
          description: The ID of the speaker if available.
        logprob:
          type: number
          format: double
          description: Confidence score for this word.
        characters:
          type: array
          items:
            type: string
          description: The characters in the word.
      description: Word-level transcription data with timing information.
      title: TranscriptionWord
    CommittedTranscriptWithTimestamps:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - committed_transcript_with_timestamps
          description: The message type identifier.
        text:
          type: string
          description: Committed transcription text.
        language_code:
          type:
            - string
            - 'null'
          description: Detected or specified language code.
        words:
          type:
            - array
            - 'null'
          items:
            $ref: '#/components/schemas/TranscriptionWord'
          description: Word-level information with timestamps.
      required:
        - message_type
        - text
      description: Payload for committed transcription results with word-level timestamps.
      title: CommittedTranscriptWithTimestamps
    DetectedEntity:
      type: object
      properties:
        text:
          type: string
          description: The text that was identified as an entity.
        entity_type:
          type: string
          description: >-
            The type of entity detected (e.g., 'credit_card', 'email_address',
            'person_name').
        start_char:
          type: integer
          description: Start character position in the transcript text.
        end_char:
          type: integer
          description: End character position in the transcript text.
      required:
        - text
        - entity_type
        - start_char
        - end_char
      description: An entity detected within transcribed text.
      title: DetectedEntity
    CommittedTranscriptEntities:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - committed_transcript_entities
          description: The message type identifier.
        text:
          type: string
          description: The committed transcript text the entities were detected in.
        entities:
          type: array
          items:
            $ref: '#/components/schemas/DetectedEntity'
          description: Detected entities. Empty if none were found.
      required:
        - message_type
        - text
        - entities
      description: Payload for detected entities on a committed transcript.
      title: CommittedTranscriptEntities
    EditedTranscript:
      type: object
      properties:
        message_type:
          type: string
          default: edited_transcript
        text:
          type: string
          description: The committed transcript text the edit instruction was applied to.
        edited_text:
          type: string
          description: >-
            The edited transcript text. If no edits were made it will be
            identical to the `text` field.
      required:
        - text
        - edited_text
      title: EditedTranscript
    ScribeWarning:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - warning
        warning:
          type: string
      required:
        - warning
      title: ScribeWarning
    ScribeError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - error
          description: The message type identifier.
        error:
          type: string
          description: Error message describing what went wrong.
      required:
        - message_type
        - error
      description: Payload for error events during transcription.
      title: ScribeError
    ScribeAuthError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - auth_error
          description: The message type identifier.
        error:
          type: string
          description: Authentication error details.
      required:
        - message_type
        - error
      description: Payload for authentication errors.
      title: ScribeAuthError
    ScribeQuotaExceededError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - quota_exceeded
          description: The message type identifier.
        error:
          type: string
          description: Quota exceeded error details.
      required:
        - message_type
        - error
      description: Payload for quota exceeded errors.
      title: ScribeQuotaExceededError
    ScribeThrottledError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - commit_throttled
          description: The message type identifier.
        error:
          type: string
          description: Throttled error details.
      required:
        - message_type
        - error
      description: Payload for throttled errors.
      title: ScribeThrottledError
    ScribeUnacceptedTermsError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - unaccepted_terms
          description: The message type identifier.
        error:
          type: string
          description: Unaccepted terms error details.
      required:
        - message_type
        - error
      description: Payload for unaccepted terms errors.
      title: ScribeUnacceptedTermsError
    ScribeRateLimitedError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - rate_limited
          description: The message type identifier.
        error:
          type: string
          description: Rate limited error details.
      required:
        - message_type
        - error
      description: Payload for rate limited errors.
      title: ScribeRateLimitedError
    ScribeQueueOverflowError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - queue_overflow
          description: The message type identifier.
        error:
          type: string
          description: Queue overflow error details.
      required:
        - message_type
        - error
      description: Payload for queue overflow errors.
      title: ScribeQueueOverflowError
    ScribeResourceExhaustedError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - resource_exhausted
          description: The message type identifier.
        error:
          type: string
          description: Resource exhausted error details.
      required:
        - message_type
        - error
      description: Payload for resource exhausted errors.
      title: ScribeResourceExhaustedError
    ScribeSessionTimeLimitExceededError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - session_time_limit_exceeded
          description: The message type identifier.
        error:
          type: string
          description: Session time limit exceeded error details.
      required:
        - message_type
        - error
      description: Payload for session time limit exceeded errors.
      title: ScribeSessionTimeLimitExceededError
    ScribeInputError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - input_error
          description: The message type identifier.
        error:
          type: string
          description: Input error details.
      required:
        - message_type
        - error
      description: Payload for input errors.
      title: ScribeInputError
    ScribeInvalidRequestError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - invalid_request
        error:
          type: string
      required:
        - message_type
        - error
      title: ScribeInvalidRequestError
    ScribeChunkSizeExceededError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - chunk_size_exceeded
          description: The message type identifier.
        error:
          type: string
          description: Chunk size exceeded error details.
      required:
        - message_type
        - error
      description: Payload for chunk size exceeded errors.
      title: ScribeChunkSizeExceededError
    ScribeInsufficientAudioActivityError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - insufficient_audio_activity
          description: The message type identifier.
        error:
          type: string
          description: Insufficient audio activity error details.
      required:
        - message_type
        - error
      description: Payload for insufficient audio activity errors.
      title: ScribeInsufficientAudioActivityError
    ScribeTranscriberError:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - transcriber_error
          description: The message type identifier.
        error:
          type: string
          description: Transcriber error details.
      required:
        - message_type
        - error
      description: Payload for transcriber errors.
      title: ScribeTranscriberError
    V1SpeechToTextRealtimeSubscribe:
      oneOf:
        - $ref: '#/components/schemas/SessionStarted'
        - $ref: '#/components/schemas/PartialTranscript'
        - $ref: '#/components/schemas/CommittedTranscript'
        - $ref: '#/components/schemas/CommittedTranscriptWithTimestamps'
        - $ref: '#/components/schemas/CommittedTranscriptEntities'
        - $ref: '#/components/schemas/EditedTranscript'
        - $ref: '#/components/schemas/ScribeWarning'
        - $ref: '#/components/schemas/ScribeError'
        - $ref: '#/components/schemas/ScribeAuthError'
        - $ref: '#/components/schemas/ScribeQuotaExceededError'
        - $ref: '#/components/schemas/ScribeThrottledError'
        - $ref: '#/components/schemas/ScribeUnacceptedTermsError'
        - $ref: '#/components/schemas/ScribeRateLimitedError'
        - $ref: '#/components/schemas/ScribeQueueOverflowError'
        - $ref: '#/components/schemas/ScribeResourceExhaustedError'
        - $ref: '#/components/schemas/ScribeSessionTimeLimitExceededError'
        - $ref: '#/components/schemas/ScribeInputError'
        - $ref: '#/components/schemas/ScribeInvalidRequestError'
        - $ref: '#/components/schemas/ScribeChunkSizeExceededError'
        - $ref: '#/components/schemas/ScribeInsufficientAudioActivityError'
        - $ref: '#/components/schemas/ScribeTranscriberError'
      title: V1SpeechToTextRealtimeSubscribe
    InputAudioChunk:
      type: object
      properties:
        message_type:
          type: string
          enum:
            - input_audio_chunk
          description: The message type identifier.
        audio_base_64:
          type: string
          format: base64
          description: Base64-encoded audio data.
        commit:
          type: boolean
          description: Whether to commit the transcription after this chunk.
        sample_rate:
          type: integer
          description: Sample rate of the audio in Hz.
        previous_text:
          type: string
          description: >-
            Send text context to the model. Can only be sent alongside the first
            audio chunk. If sent in a subsequent chunk, an error will be
            returned.
      required:
        - message_type
        - audio_base_64
        - commit
        - sample_rate
      description: Payload for sending audio chunks from client to server.
      title: InputAudioChunk
    V1SpeechToTextRealtimePublish:
      oneOf:
        - $ref: '#/components/schemas/InputAudioChunk'
      title: V1SpeechToTextRealtimePublish

```

## Related pages

- [Administration](./administration-index.md)
- [API reference](./api-reference-index.md)
- [Changelog](./changelog-index.md)
- [ElevenAgents](./elevenagents-index.md)
- [ElevenAPI](./elevenapi-index.md)
- [ElevenCreative](./elevencreative-index.md)
- [ElevenLabs Documentation Docs](../index.md)
- [General Troubleshooting FAQ](./troubleshooting-index.md)
- [General Website FAQ](./website-index.md)
- [Help Center](./help-center-2-index.md)

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