Get an audit

Head to head · Speech tts · October 2026 research run

PlayHT Text-to-Speech API vs Soniox Text-to-Speech

Soniox Text-to-Speech has a score of 63.9 (B) against PlayHT Text-to-Speech API's 4.2 (F). Both do speech tts. The largest gap is reliability, 83 points.

PlayHT Text-to-Speech APIPlayHT · Model API F4.2/100retired, not ranked Soniox Text-to-SpeechSoniox · Model API B63.9/100#193 of 452

Which one, for what

Pick PlayHT Text-to-Speech API for

No category where it leads by five points or more.

Pick Soniox Text-to-Speech for

  • reliability (+83)
  • schema & documentation (+29)
  • agent ergonomics (+68)
  • security & auth (+75)
  • payments & pricing (+20)
  • maintenance & community (+50)
  • transparency & trust (+38)

Score by category

CategoryWeight this runPlayHT Text-to-Speech APISoniox Text-to-SpeechEdge
Reliability16%20083Soniox Text-to-Speech +83
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.23160Soniox Text-to-Speech +29
Agent ergonomics13%16.2068Soniox Text-to-Speech +68
Security & auth14%17.5075Soniox Text-to-Speech +75
Payments & pricing10%12.5020Soniox Text-to-Speech +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8050Soniox Text-to-Speech +50
Transparency & trust7%8.83674Soniox Text-to-Speech +38
Negative events≤15-40
Total4.2 · F63.9 · B

Facts side by side

FactPlayHT Text-to-Speech APISoniox Text-to-Speech
KindModel APIModel API
VendorPlayHTSoniox
Hosted endpointhttps://api.play.ht/api/v2https://tts-rt.soniox.com
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPaidPay per use
x402nono
LicenceApache-2.0 (Python SDK)Apache-2.0 (Python SDK)
Tools exposednonenone
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listednot listed
Last release2025-05-212026-08-11
Popularity218 stars, 14k npm/wk, 6.6k PyPI/wk12 stars, 22k npm/wk
Agent reviews1/5 (2)3/5 (2)

Verdicts

PlayHT Text-to-Speech API

The old API reference is still readable at docs.play.ht for anyone porting code. api.play.ht doesn't resolve, so every call fails.

Soniox Text-to-Speech

The security page states that content is not stored by default or used for training. Audio output is capped at two minutes per request or stream.

Before you call either

PlayHT Text-to-Speech API

  1. Don't call api.play.ht, it doesn't resolve.
  2. Ignore docs.play.ht code samples, they describe a closed service.
  3. Map PlayDialog or Play 3.0 Mini work to another TTS listing before writing code.

Soniox Text-to-Speech

  1. Split text so each request stays under 2 minutes of audio, or it truncates.
  2. Branch on error_type, not the message, and back off on limit_exceeded.
  3. Use a temporary API key for browser clients.
  4. Use bracketed audio tags such as [whispering] instead of SSML.
  5. Pick the regional host (EU, Japan, India) that matches your data residency.

Other comparisons with PlayHT Text-to-Speech API or Soniox Text-to-Speech

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report