IBM Watson Speech to Text

Plans and prices

Every plan, in full

On the record

API access

Yescloud.ibm.com · read 22 Sep 2026

Call analysis

IBM describes using Speech to Text transcriptions with Watson Natural Language Understanding to analyze customer calls.cloud.ibm.com · read 9 Oct 2026

Customization

Paid plans can customize language and acoustic models, and language models can use grammars to restrict recognized phrases.cloud.ibm.com · read 9 Oct 2026

Data deletion

Customers can label data with a customer ID and use an API method to delete data associated with that ID.cloud.ibm.com · read 9 Oct 2026

Export formats

JSONcloud.ibm.com · read 22 Sep 2026

Input limitation

The service accepts audio data only; IBM says audio must be separated from video before transcription.cloud.ibm.com · read 9 Oct 2026

Integrations

IBM documents a pre-built phone assistant integration combining watsonx Assistant, Speech to Text, and Watson Text to Speech.cloud.ibm.com · read 9 Oct 2026

Intended users

IBM identifies customer self-service, agent assistance, and call analytics as use cases, and describes Plus as intended for small businesses and development or testing by larger enterprises.ibm.com · read 9 Oct 2026

Interim results

The product page says applications can use transcription as it is generated before final results are complete.ibm.com · read 9 Oct 2026

Languages supported

14cloud.ibm.com · read 22 Sep 2026

Languages and audio

IBM lists support for multiple languages and formats including WAV, FLAC, MP3, Ogg, WebM, and PCM.cloud.ibm.com · read 9 Oct 2026

Request limits

Synchronous HTTP and WebSocket requests accept up to 100 MB of audio, while asynchronous HTTP accepts up to 1 GB.cloud.ibm.com · read 9 Oct 2026

Security

Premium offers data isolation and features including Key Protect, service endpoints, mutual authentication, and HIPAA readiness.cloud.ibm.com · read 9 Oct 2026

Speaker diarization

IBM’s product page says the service can recognize who said what in a multi-participant voice exchange.ibm.com · read 9 Oct 2026

Speaker identification

Yescloud.ibm.com · read 22 Sep 2026

Streaming and batch

It supports synchronous and asynchronous HTTP interfaces and a full-duplex WebSocket interface for low-latency communication.cloud.ibm.com · read 9 Oct 2026

Support availability

Premium instances require contacting an IBM sales representative before provisioning.cloud.ibm.com · read 9 Oct 2026

Timestamp support

Yescloud.ibm.com · read 22 Sep 2026

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