AssemblyAI vs Groq (hosted Whisper)

For developers building transcription products, pricing, SDKs, streaming, timestamps, and format flexibility all matter. On batch pricing, Groq (hosted Whisper) is cheaper at $0.00185/audio-min versus AssemblyAI at $0.0035/audio-min, and both ship Python and JS SDKs. Word-level timestampsword-level timestamps - The API reports exactly when each word is spoken in the audio, for subtitles and highlighting. are identical. On audio format flexibility, AssemblyAI supports 30+ formats compared to Groq's 9. The decisive gap is the websocket streaming API: AssemblyAI offers it natively, while Groq (hosted Whisper) does not. For product developers who need real-time transcription capability alongside batch jobs, that streaming gap is a hard blocker Groq cannot overcome even with its lower per-minute rate.

For personal dictation on your own computer, the deciding factors are platform support, whether audio stays on the device, AI formatting features, pricing structure, and app integrations. Neither AssemblyAI nor Groq (hosted Whisper) is a dictation app: both are speech-to-text API services. Neither publishes information about desktop dictation platform support, on-device processing, AI formatting or autocorrect layers, one-time versus subscription app pricing, or integrations with word processors or OS dictation hooks. Both send audio to the cloud, and neither offers a verified on-device inference mode for end users. Both use usage-based pricing with no dictation-app tier, and neither provides a ready-made dictation interface. On the attributes that matter most here, both tools are equally silent.

For clinical transcription under US healthcare privacy law, a signed HIPAA BAAHIPAA BAA - A signed Business Associate Agreement that lets you handle protected health information under US healthcare privacy law. is the absolute prerequisite before any other feature matters. AssemblyAI includes a HIPAA BAA, while no such fact exists for Groq (hosted Whisper), making AssemblyAI the only viable option at that first gate. PII redaction is the next critical requirement for protecting patient data, and AssemblyAI offers it as a paid add-on at $0.001333/audio-min, whereas Groq (hosted Whisper) has no PII redaction capability at all. Both tools support custom vocabulary for medical terminology boosting and both hold SOC 2 Type II certification, so those attributes are level. The HIPAA BAA gap alone would decide this use case, and the absence of PII redaction in Groq (hosted Whisper) reinforces the verdict decisively.

Both AssemblyAI and Groq (hosted Whisper) confirm a self-hostself-host - Run the software on your own servers instead of the vendor’s cloud. or on-premises option is available, so neither has an edge on the most critical factor for this use case. Beyond that single shared data point, no information is available on model weights licensing, hardware requirements, project maintenance status, or model parameter counts for either tool. Without those details, which are central to evaluating a true self-hosted deployment, there is no basis to prefer one over the other.

For live voice agents, real-time streaming capability is the deciding factor. AssemblyAI has a published WebSocket streaming API while Groq (hosted Whisper) has none. Without a streaming API, Groq cannot feed a voice bot with low-latency transcription at all, making every other comparison moot for this use case. AssemblyAI claims 150 ms streaming latency, well within the threshold needed for a natural conversational agent. Streaming is priced at $0.0075 per audio minute ($0.45 per hour), a real cost to budget but unavoidable since it is the only option here. AssemblyAI also handles 100 new streams per minute on the base plan and supports custom vocabularykeyterm boosting - Telling the model your product names and jargon in advance so it transcribes them correctly. for domain-specific terminology the bot needs to recognize.