Best Speech-to-text APIs for Medical (2026)
For medical, AssemblyAI is our pick: Both tools offer a HIPAA BAA and SOC 2 Type II certification, so the top criteria are matched. Clinical transcription under US healthcare privacy law: a HIPAA BAA is the gate, and medical vocabulary decides accuracy. Below is the full ranking and the tradeoffs, or read how we score.
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Reviewed by vsref Editorialfacts verified Jul 24, 2026Methodology →
AssemblyAIWINNER
What matters for medical
Weight ×5 = decisive, ×1 = relevant| Fact | AssemblyAI | Deepgram | OpenAI Whisper (API) | Amazon Transcribe | Gladia |
|---|---|---|---|---|---|
| HIPAA BAA available×5 | ✓ IncludedJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 |
| PII redaction×4 | ◑ Paid add-onJul 20 | ◑ Paid add-onJul 20 | ✗ Not availableJul 20 | ◑ Paid add-onJul 20 | ✓ IncludedJul 20 |
| Custom vocabulary / keyterm boosting×4 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 |
| SOC 2 Type II×3 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 | ✓ YesJul 20 |
| Self-host / on-prem option×2 | ✓ YesJul 20 | ✓ YesJul 20 | ✗ NoJul 20 | ✗ NoJul 20 | ✓ YesJul 20 |
The ranking, tool by tool
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so the top criteria are matched. Full AssemblyAI vs OpenAI Whisper (API) verdict →
Both tools offer a HIPAA BAA, SOC 2 Type II, custom vocabulary, and self-host options, so those attributes do not separate them. Full AssemblyAI vs Speechmatics verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, making them equal on the two highest-weighted compliance requirements. Full AssemblyAI vs Soniox verdict →
For clinical transcription under US healthcare privacy law, the HIPAA BAA is the decisive gate. Full AssemblyAI vs Rev AI verdict →
For clinical transcription under US healthcare privacy law, the HIPAA BAA is the absolute gate. Full AssemblyAI vs ElevenLabs Scribe verdict →
For clinical transcription under US healthcare privacy law, the HIPAA BAA is the absolute gate. Full Deepgram vs Smallest.ai Pulse verdict →
Both tools offer a HIPAA BAA, clearing the compliance gate equally. Full Deepgram vs Azure AI Speech (STT) verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the absolute gate requirement. Full Deepgram vs Mistral Voxtral Transcribe verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the non-negotiable requirement. Full Deepgram vs NVIDIA Parakeet / Riva verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so neither leads on those two compliance attributes. Full Deepgram vs xAI Grok Speech-to-Text verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so those attributes are tied. Full Deepgram vs OpenAI Whisper (API) verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so they tie on the two heaviest compliance attributes. Full Deepgram vs Speechmatics verdict →
Both tools clear the HIPAA BAA gate, so the decision falls to lower-ranked attributes. Full Deepgram vs Soniox verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so those top-weighted attributes are tied. Full Deepgram vs Google Cloud Speech-to-Text verdict →
Both tools offer a HIPAA BAA, SOC 2 Type II, and self-host options, so those attributes do not differentiate them. Full Deepgram vs Gladia verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the mandatory gate. Full Deepgram vs Cohere Transcribe verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so they tie on the two highest-weighted compliance attributes. Full Deepgram vs Cartesia Ink verdict →
A HIPAA BAA is the gate for this use case, and only OpenAI Whisper has a verified HIPAA BAA available. Full OpenAI Whisper (API) vs Mistral Voxtral Transcribe verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the absolute requirement. Full OpenAI Whisper (API) vs Qwen3-ASR verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the absolute gate. Full OpenAI Whisper (API) vs NVIDIA Parakeet / Riva verdict →
For clinical transcription under US healthcare privacy law, a HIPAA BAA is the absolute gate. Full OpenAI Whisper (API) vs Moonshine verdict →
The heaviest attribute for clinical transcription under US healthcare privacy law is HIPAA BAA availability. Full OpenAI Whisper (API) vs Groq (hosted Whisper) verdict →
The heaviest factor is HIPAA BAA availability. Full OpenAI Whisper (API) vs ElevenLabs Scribe verdict →
Both tools offer a HIPAA BAA and SOC 2 Type II certification, so the top and fourth-ranked attributes are tied. Full Amazon Transcribe vs Google Cloud Speech-to-Text verdict →
Both Gladia and OpenAI Whisper (API) offer a HIPAA BAA, clearing that gate requirement equally. Full Gladia vs OpenAI Whisper (API) verdict →
Flagship GPT-4o based transcription API from OpenAI. No won verdicts for this use case yet; it ranks on ties and near-misses.
For clinical transcription under US healthcare privacy law, the HIPAA BAA requirement is the decisive gate. Full Mistral Voxtral Transcribe vs ElevenLabs Scribe verdict →
Enterprise-grade STT inside the Azure cloud ecosystem. No won verdicts for this use case yet; it ranks on ties and near-misses.
Hyperscaler STT API with Chirp foundation models and enterprise compliance. No won verdicts for this use case yet; it ranks on ties and near-misses.
Streaming STT for voice agents with native turn detection. No won verdicts for this use case yet; it ranks on ties and near-misses.
Enterprise-grade open ASR for accurate batch transcription. No won verdicts for this use case yet; it ranks on ties and near-misses.
Accuracy-led STT API from the leading AI audio company. No won verdicts for this use case yet; it ranks on ties and near-misses.
Low-cost hosted STT API on the Grok stack. No won verdicts for this use case yet; it ranks on ties and near-misses.
Ultra-fast, low-cost hosted Whisper transcription API (no realtime streaming). No won verdicts for this use case yet; it ranks on ties and near-misses.
On-device streaming STT for live voice interfaces, from tiny edge models to Whisper Large v3-beating accuracy. No won verdicts for this use case yet; it ranks on ties and near-misses.
Open-weights, GPU-accelerated self-hosted STT stack. No won verdicts for this use case yet; it ranks on ties and near-misses.
Open-weights multilingual ASR models. No won verdicts for this use case yet; it ranks on ties and near-misses.
Transcription-heritage STT API with low per-hour pricing and open (non-commercial) Reverb models. No won verdicts for this use case yet; it ranks on ties and near-misses.
Ultra-low-latency multilingual STT for voice agents. No won verdicts for this use case yet; it ranks on ties and near-misses.
Ultra-low-cost multilingual STT + real-time translation API. No won verdicts for this use case yet; it ranks on ties and near-misses.
Accuracy-first enterprise STT with flexible deployment (SaaS, container, on-prem). No won verdicts for this use case yet; it ranks on ties and near-misses.