# RealtimeTranslationServerEventSessionInputTranscriptDelta
## Properties
**event_id** | **String** | The unique ID of the server event. |
**r#type** | **String** | The event type, must be `session.input_transcript.delta`. |
**delta** | **String** | Append-only source-language transcript text. |
**elapsed_ms** | Option<**i32**> | Timing metadata for stream alignment, derived from the translation frame when available. It advances in 200 ms increments, but multiple transcript deltas may share the same `elapsed_ms`. Treat it as alignment metadata, not a unique transcript-delta identifier. | [optional]
[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)