Soniox

Best for: Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt); Teams needing broad API coverage out of the box

Avoid if: You want to try it free before paying

Pricing model

Usage-based [2]soniox.com/pricing“Input audio tokens: $2.00 per 1M tokens ... about $0.12/hour for real-time (streaming)”soniox.com/pricing“Input audio tokens: $1.50 per 1M tokens ... about $0.10/hour for async (file)”

Published pricing

✓ Yes [3]soniox.com/pricing“$1.50 per 1M tokens ... $2.00 per 1M tokens ... $3.50 per 1M tokens ... $4.00 per 1M tokens”

Free tier

✗ No [4]soniox.com/blog/2025-10-27-free-credits-update-for-soniox-api“We will no longer offer free credits going forward. Developers who are serious about building with Soniox can still get started easily with pay-as-you-go pricing.”soniox.com/pricing“The page contains no mention of free tiers, trial periods, or complimentary credits.”

Self-serve signup

✓ Yes [5]soniox.com/docs/stt/get-started“Create a Soniox account and log in to the Console to get your API key.”

Requires sales call

✗ No

Enterprise plan

✓ Yes [6]soniox.com/pricing“Enterprise discounts and committed-use contracts may differ”

• Real-time streaming
• Speaker diarization
• Speech translation
• Medical transcription

Supported actions

transcribe_streaming, transcribe_batch, speaker_diarization, language_detection, word_timestamps, translation, multilingual_transcription, context_customization, turn_detection, temporary_api_keys, webhook_notifications [7]soniox.com/docs/stt/async/async-transcription“speaker diarization where each token will include a 'speaker' field and language identification where each token will include a 'language' field”soniox.com/docs/stt/api-reference/websocket-api“Each stream supports up to 300 minutes of audio”

Regions

United States, European Union, Japan [8]soniox.com/docs/api-reference“Regional deployment options (US, EU, Japan - see Data residency guide)”soniox.com/docs/data-residency“all audio and transcript data for that project stays in that region, for both processing and storage”

Languages

Afrikaans, Albanian, Arabic, Azerbaijani, Basque, Belarusian, Bengali, Bosnian, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, Galician, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Kazakh, Korean, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Marathi, Norwegian, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Tagalog, Tamil, Telugu, Thai, Turkish, Ukrainian, Urdu, Vietnamese, Welsh [9]soniox.com/docs/stt/concepts/supported-languages“Afrikaans, Albanian, Arabic, Azerbaijani, Basque, Belarusian, Bengali, Bosnian, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, Galician, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Kazakh, Korean, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Marathi, Norwegian, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Tagalog, Tamil, Telugu, Thai, Turkish, Ukrainian, Urdu, Vietnamese, and Welsh”soniox.com/docs/stt/concepts/supported-languages“Soniox Speech-to-Text AI supports transcription and translation in 60+ languages with world-leading accuracy.”

Input types

audio/aac, audio/aiff, audio/amr, audio/asf, audio/flac, audio/mp3, audio/ogg, audio/wav, audio/webm, audio/m4a, video/mp4, PCM s8, PCM s16le, PCM s24le, PCM s32le, PCM f32le, mulaw, alaw, live WebSocket stream, file URL, local file upload [10]soniox.com/docs/sdk/node-SDK/reference/types“pcm_s8, pcm_s16le, pcm_s24le, pcm_s32le, pcm_f32le, mulaw, alaw, aac, wav, mp3, flac, ogg, webm”soniox.com/docs/stt/rt/real-time-transcription“Auto-detected formats: aac, aiff, amr, asf, flac, mp3, ogg, wav, webm”

Output types

JSON with word-level tokens, start_ms/end_ms word timestamps, speaker labels, language codes, confidence scores, is_final flags [11]soniox.com/docs/stt/api-reference/websocket-api“{"tokens": [{"text": "Hello", "start_ms": 600, "end_ms": 760, "confidence": 0.97, "is_final": true, "speaker": "1"}]}”

Webhooks

✓ Yes [12]soniox.com/docs/stt/async/webhooks“Two event statuses are supported: completed - transcription job finished successfully; error - transcription job encountered an error”

Sandbox / test mode

✗ No [13]soniox.com/pricing“The page contains no mention of free tiers, trial periods, or complimentary credits.”

SDK languages

Python, Node.js, JavaScript (browser) [14]github.com/soniox/speech-to-text-web“Soniox Speech-To-Text Web library”soniox.com/docs/stt/SDKs/python-SDK“PyPI Package Name: soniox. GitHub Repository: https://github.com/soniox/soniox-python. The official Python SDK provides fully typed access to our Speech-to-Text and Text-to-Speech REST and realtime APIs.”

MCP server

✓ Yes [15]soniox.com/docs/ai-engineering“"mcpServers": {"soniox-docs": {"url": "https://soniox.com/docs/api/mcp/mcp"}}”soniox.com/docs/ai-engineering“The server enables developers to access Soniox documentation right from tools like Cursor, Windsurf, or Claude Code without switching applications”

SOC 2

SOC 2 Type II [16]soniox.com/speech-to-text“SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR”soniox.com/docs/security-and-privacy“SOC 2 Type 2: auditing standard that evaluates an organization's controls for security, availability, processing integrity, confidentiality, and privacy over an extended period”

HIPAA

✓ Yes [17]soniox.com/speech-to-text“SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR”soniox.com/docs/security-and-privacy“HIPAA: U.S. framework for protecting sensitive healthcare data and PHI”

GDPR

✓ Yes [18]soniox.com/speech-to-text“SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR”soniox.com/docs/security-and-privacy“GDPR: EU regulation governing personal data collection, processing, and protection”

ISO 27001

✓ Yes [19]soniox.com/speech-to-text“SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR”soniox.com/docs/security-and-privacy“ISO/IEC 27001:2022: Internationally recognized Information Security Management Systems standard”

PCI DSS

✗ No [20]soniox.com/docs/security-and-privacy“SOC 2 Type 2 ... ISO/IEC 27001:2022 ... GDPR ... HIPAA”

Published SLA

✓ Yes [21]soniox.com/speech-to-text“99.9% uptime — Production-hardened infrastructure with monitoring and redundancy.”

Rate limits

Async API: max 1,000 files stored simultaneously, 10 GB total storage, 100 pending transcriptions, 2,000 total transcriptions, 300-minute max file duration (non-negotiable). Real-time WebSocket: per-organization and per-project concurrent request caps and requests-per-minute caps (exact numbers not published; increase requests via Soniox Console). [22]soniox.com/docs/stt/api-reference/websocket-api“A usage or rate limit has been exceeded. You may retry after a delay or request an increase in limits via the Soniox Console.”soniox.com/docs/stt/async/limits-and-quotas“Total storage: 10 GB across all uploaded files; Maximum files: 1,000 files stored simultaneously; File duration: 300 minutes (fixed, non-negotiable); Pending transcriptions: 100 maximum requests awaiting processing; Total transcriptions: 2,000”

Known restrictions

Maximum audio file duration is 300 minutes (fixed, cannot be increased), Uploaded files are not deleted automatically - must be manually deleted, PCI DSS compliance not stated, Specific concurrent connection numbers not published - must request increase via Console, Free credits discontinued as of October 2025 - pay-as-you-go only [23]soniox.com/docs/stt/async/limits-and-quotas“File duration: 300 minutes (fixed, non-negotiable)”soniox.com/docs/stt/async/limits-and-quotas“You must manually delete files after obtaining transcription results. Files are not deleted automatically.”

• Docs
• llms.txt
• Status page

Docs rendering: static · llms.txt present

API style

rest

Base URL

https://api.soniox.com/v1

Version

v1

Versioning

url

Stability

ga

Auth methods

api_key

Error format

vendor-specific

SDKs

• Python soniox · repo
• Node.js @soniox/node · repo
• JavaScript (browser) @soniox/speech-to-text-web · repo

• Auth docs
• Quickstart
• MCP server
• Webhook events

Launched

2020-01-01

GA

2022-01-01

Notable customers

Scribe

• ElevenLabs Scribe (Speech to Text)

  "Scribe v2 is the most accurate Speech to Text model" offering "real-time Speech to Text in under 150 ms" across "90+ languages."

  Hybrid · free tier · public pricing · self-serve

• Azure AI Speech to Text

  "Azure Speech in Foundry Tools provides speech to text, text to speech, and other capabilities through a Microsoft Foundry resource. You can transcribe speech to text with high accuracy, produce natural-sounding text-to-speech voices, translate spoken audio, and conduct live AI voice conversations."

  Usage · free tier · public pricing · self-serve

• Amazon Transcribe

  "Amazon Transcribe is an automatic speech recognition service that uses machine learning models to convert audio to text. You can use Amazon Transcribe as a standalone transcription service or to add speech-to-text capabilities to any application."

  Usage · free tier · public pricing · self-serve

• Google Cloud Speech-to-Text

  "Accurate voice typing and transcription powered by Gemini."

  Usage · free tier · public pricing · self-serve

• IBM watsonx Speech to Text

  "IBM Watson® Speech to Text technology enables fast and accurate speech transcription in multiple languages for a variety of use cases, including but not limited to customer self-service, agent assistance and speech analytics."

  Usage · free tier · public pricing · self-serve

• AssemblyAI

  "Voice AI infrastructure for developers building products that transcribe, understand, and act on speech."

  Usage · public pricing · self-serve

Soniox alternatives · Soniox vs ElevenLabs Scribe (Speech to Text) · All Speech-to-Text & Transcription APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: soniox.com
2. ↑Pricing model: soniox.com · soniox.com
3. ↑Published pricing: soniox.com
4. ↑Free tier: soniox.com · soniox.com
5. ↑Self-serve signup: soniox.com
6. ↑Enterprise plan: soniox.com
7. ↑Supported actions: soniox.com · soniox.com
8. ↑Regions: soniox.com · soniox.com
9. ↑Languages: soniox.com · soniox.com
10. ↑Input types: soniox.com · soniox.com
11. ↑Output types: soniox.com
12. ↑Webhooks: soniox.com
13. ↑Sandbox: soniox.com
14. ↑SDK languages: github.com · soniox.com
15. ↑MCP server: soniox.com · soniox.com
16. ↑SOC 2: soniox.com · soniox.com
17. ↑HIPAA: soniox.com · soniox.com
18. ↑GDPR: soniox.com · soniox.com
19. ↑ISO 27001: soniox.com · soniox.com
20. ↑PCI DSS: soniox.com
21. ↑Published SLA: soniox.com
22. ↑Rate limits: soniox.com · soniox.com
23. ↑Known restrictions: soniox.com · soniox.com

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-21 Capabilities: {} → {"medical":true,"translation":true,"real_time_streaming":true,"speaker_diarizat…
2. 2026-06-21 Summary Md: (none) → Soniox is a speech-to-text API built for real-time and batch transcription work…
3. 2026-06-21 Score Docs Quality: (none) → 25
4. 2026-06-21 Score Procurement Friction: (none) → 85
5. 2026-06-21 Score Trust Readiness: (none) → 90
6. 2026-06-21 Best For: (none) → Regulated or enterprise workloads - compliance attestations and an enterprise p…
7. 2026-06-21 Avoid If: (none) → You want to try it free before paying
8. 2026-06-21 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
9. 2026-06-21 Score Agent Friendliness: (none) → 65
10. 2026-06-21 Score Pricing Transparency: (none) → 85
11. 2026-06-21 Score Setup Speed: (none) → 60
12. 2026-06-21 Llms Txt Present: (none) → Yes
13. 2026-06-21 Rendering: (none) → static
14. 2026-06-21 Has Structured Data: (none) → Yes
15. 2026-06-21 Robots Allows Agents: (none) → Yes
16. 2026-06-21 Status Page URL: (none) → https://status.soniox.com
17. 2026-06-21 Docs URL: (none) → https://soniox.com/docs
18. 2026-06-21 Llms Txt URL: (none) → https://soniox.com/llms.txt
19. 2026-06-21 Free Tier Available: set to No
20. 2026-06-21 Self Serve Signup: set to Yes
21. 2026-06-21 Requires Sales Call: set to No
22. 2026-06-21 Enterprise Plan Available: set to Yes
23. 2026-06-21 SOC 2: set to type_2
24. 2026-06-21 HIPAA: set to Yes
25. 2026-06-21 GDPR: set to Yes
26. 2026-06-21 ISO 27001: set to Yes
27. 2026-06-21 PCI DSS: set to No
28. 2026-06-21 SLA Published: set to Yes
29. 2026-06-21 Data Retention Policy URL: set to https://soniox.com/docs/security-and-privacy
30. 2026-06-21 Documented Rate Limits: set to Async API: max 1,000 files stored simultaneously, 10 GB total storage, 100 pend…
31. 2026-06-21 Known Restrictions: set to Maximum audio file duration is 300 minutes (fixed, cannot be increased), Upload…
32. 2026-06-21 Auth Methods: set to api_key
33. 2026-06-21 Auth Docs URL: set to https://soniox.com/docs/api-reference/auth/create_temporary_api_key
34. 2026-06-21 API Style: set to rest
35. 2026-06-21 Base URL: set to https://api.soniox.com/v1
36. 2026-06-21 API Version: set to v1
37. 2026-06-21 Versioning Scheme: set to url
38. 2026-06-21 Stability: set to ga
39. 2026-06-21 MCP URL: set to https://soniox.com/docs/api/mcp/mcp
40. 2026-06-21 Quickstart URL: set to https://soniox.com/docs/stt/get-started
41. 2026-06-21 Error Format: set to vendor-specific
42. 2026-06-21 Webhook Events URL: set to https://soniox.com/docs/stt/async/webhooks
43. 2026-06-21 Requires Verification: set to No
44. 2026-06-21 Slug: set to soniox
45. 2026-06-21 Price Basis: set to minute
46. 2026-06-21 Launched At: set to 2020-01-01
47. 2026-06-21 GA Date: set to 2022-01-01
48. 2026-06-21 Notable Customers: set to Scribe
49. 2026-06-21 Fields Not Found: set to exact concurrent connection numbers for real-time streaming, maximum file uploa…
50. 2026-06-21 Source Confidence: set to high

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

curl -X POST https://apio.sh/api/feedback/soniox \
  -H 'Content-Type: application/json' \
  -d '{"kind":"review","rating":5,"body":"Your experience with this API…"}'

curl -X POST https://apio.sh/api/suggest/soniox/FIELD \
  -H 'Content-Type: application/json' \
  -d '{"value":"corrected value","citations":[{"url":"https://source.example/page","excerpt":"supporting quote"}],"note":"what changed and why"}'

All the ways to contribute →