Provider Comparison Matrix

Benchmarks, pricing models, ELO scores, word error rates, feature sets, and compliance certifications across every active TTS & STT provider. Updated July 2026.

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Provider	Gradium BOTH	Inworld AI TTS	ElevenLabs BOTH	Deepgram BOTH	AssemblyAI STT	Cartesia TTS	Alibaba Qwen-Audio-3.0-TTS-PlusNEW TTS	Speechify Simba 3.2NEW TTS	Google Gemini 3.1 Flash TTS TTS	Mistral Voxtral TTS	Microsoft MAINEW BOTH	xAI Grok TTS BOTH	OpenAI BOTH	Azure AI Speech BOTH	Google Cloud Speech BOTH	Hume AI TTS	LeanVox TTS	Kokoro v1.0OPEN SOURCE TTS	ChatterboxOPEN SOURCE TTS	Qwen3-TTSOPEN SOURCE TTS	Fish Audio S2 ProOPEN SOURCE TTS	Moonshine (Useful Sensors)OPEN SOURCE STT	PlayHTDISCONTINUED TTS
Pricing	Monthly credit plans. XS: $13/month for 225,000 shared credits. TTS: 1 credit/character; STT: 3 credits/second. Free plan available for non-commercial use. Excluded from the usage-only calculator because it does not model shared credits or subscription minimums. Provider pricing	TTS-1.5 Max: $50/1M chars standard ($10/1M on legacy Founder tier) TTS-1.5 Mini: $25/1M chars standard ($5/1M on legacy Founder tier)	Starter: $6/mo for 30k chars Creator: $22/mo for 121k chars Scale API: ~$165/1M chars (Scale)	Nova-3 STT: $0.0043–$0.0077/min (per-second billing) Voice Agent API: ~$0.075/min (STT+LLM+TTS)	Universal-2: $0.0025/min ($0.15/hr) — 99 languages Universal-3.5 Pro: $0.0035/min ($0.21/hr async) — prompt-based customization Sync / Realtime API: $0.0075/min ($0.45/hr) — ~134ms median (Jul 14, 2026)	Pay-as-you-go: $5/100k credits (1 credit/char)	API: $27.60/1M chars	API: $10/1M chars	Flash TTS: ~$18.30/1M chars	API: $16/1M chars	MAI-Transcribe-1.5: ~$0.017/min (Azure Foundry pricing) MAI-Voice-2: $16/1M chars	TTS API: $4.20/1M chars	TTS Standard: $15/1M chars (tts-1) TTS HD: $30/1M chars (tts-1-hd) GPT-4o Transcribe: $0.006/min — free diarization Mini Transcribe: $0.003/min — budget option	Neural TTS (Prebuilt): $16/1M chars Neural HD 2.5: $22/1M chars (down from $30, Mar 2026) STT Standard: $0.017/min (140+ languages)	WaveNet: $4/1M chars (standard) Chirp 3 HD: $30/1M chars (HD) STT V2 Real-time: $0.016/min ($0.004/min Dynamic Batch)	Octave 2: $7.60/1M chars	Standard: $5/1M chars	Self-hosted: Free (compute only) Hosted (DeepInfra): ~$0.65/1M chars hosted	Self-hosted: Free (MIT license)	Self-hosted: Free (Apache 2.0)	API: ~$10/1M chars (commercial API) Research weights: Free — non-commercial only (Fish Audio Research License)	Self-hosted: Free (MIT license)	Service discontinued
Quality & ELO	Not scored	Quality Speed ELO 1,198 130ms TTFA	Quality Speed ELO 1,197 75ms TTFA	Quality Speed 5.3% WER	Quality Speed 14.5% WER	Quality Speed ELO 1,208 40ms TTFA	Quality Speed ELO 1,234	Quality Speed ELO 1,230	Quality Speed ELO 1,215	Quality Speed 90ms TTFA	Quality Speed	Quality Speed	Quality Speed 5% WER	Quality Speed	Quality Speed	Quality Speed	Quality Speed	Quality Speed ELO 1,057	Quality Speed	Quality Speed 1.24% WER	Quality Speed ELO 1,120	Quality Speed	Quality Speed
Key Features	Streaming TTS and STT REST and WebSocket APIs Voice cloning Voice Design from text descriptions Semantic VAD for turn-taking	Top-5 TTS Arena ELO Zero-shot Voice Cloning (5–15s) Sub-250ms P90 Latency Realtime TTS-2 (130ms) Domain-specific Pronunciation Healthcare/Finance/Legal	Eleven v3 (GA Feb 2) Scribe v2 Realtime STT (sub-150ms, 90+ languages) On-Premise / On-Device Voice Cloning (10,000+ voices) Dubbing & Translation 74 Languages ElevenAgents IBM watsonx Integration Series D: $500M @ $11B (Feb 2026)	Nova-3 (5.3% WER) Flux Multilingual (sub-300ms EOT detection) Sub-300ms Streaming Diarization Smart Formatting TTS Speed Controls (0.7–1.5×) Self-hosted Deployment OfOne Acquisition (Restaurant Voice AI) 45+ Languages Per-second Billing	Universal-3.5 Pro Streaming Sync API (~134ms median, launched Jul 2026) Context Carryover Prompt-based Domain Customization Three Latency Modes Medical Mode (en/es/de/fr) PII Redaction Voice Agent API ($4.50/hr flat) Audio Intelligence	Sonic 3.5 (40ms Turbo TTFB) 3-second Voice Cloning Emotion Control 30+ Featured Voices Dated Immutable Model Snapshots PVC Accent/Gender PATCH API	#1 Artificial Analysis Speech Arena Alibaba Cloud Native Highest Human-preference Elo	#2 Artificial Analysis Speech Arena Best Elo-to-Price Ratio in Top 5	200+ Audio Tags (Natural-language Style Control) SynthID Watermarking 70+ Languages AI Studio / Vertex AI / Google Vids	4B Parameters 90ms TTFA Smartphone Deployment (3GB RAM) 3-second Voice Adaptation Voxtral Transcribe 2 (ASR) EU Data Sovereignty CC BY-NC 4.0 (open weights)	MAI-Voice-2 (72% preferred over v1) MAI-Transcribe-1.5 (43-language WER leader) Emotional Styles & Roles Zero-shot Cloning (5–60s) Copilot/Teams/GitHub Integration Half GPU Usage vs Competitors	5 Voices (Eve, Ara, Leo, Rex, Sal) Speech Tags ([laugh], [sigh], <whisper>) STT — 25 Languages, Batch & Streaming Vercel AI Gateway Integration OpenAI Realtime API Compatible	GPT-Realtime-2 (Configurable Reasoning) GPT-Realtime-Translate GPT-Realtime-Whisper (Streaming STT) GPT-4o Transcribe (5% WER) Free Diarization tts-1 / tts-1-hd 99+ Languages (STT)	140+ Languages (TTS) 500+ Neural Voices Neural HD 2.5 (Improved Prosody) Custom Neural Voice Speech Translation Real-time Captions Avatar Video Synthesis	Chirp 3 HD WaveNet & Studio Voices Dynamic Batch STT (75% cheaper) Gemini Integration 380+ Voices 75+ Languages Google Translate Integration	Octave 2 (sub-200ms) TADA — Open-sourced Mar 2026 5× Faster Inference 700s Long-form Generation Zero Content Hallucinations Emotional Intelligence 11 Languages	23+ Languages Standard Neural Voices REST API	82M Parameters 54 Baked-in Voices MOS 4.2 (highest open-source) CPU / Raspberry Pi Capable 36× Real-time on Free Colab T4 Apache 2.0 License 9 Languages	MIT License Turbo: 65.3% Preferred over ElevenLabs (24.5%) Chatterbox Turbo (sub-200ms) Chatterbox Multilingual (23+ languages) PerTh Neural Watermarking Paralinguistic Tags [laugh] [cough] Emotion Control	Apache 2.0 License 0.77% Chinese WER 1.24% English WER 0.6B & 1.7B Variants Base / CustomVoice / VoiceDesign Default HF Speech-to-Speech TTS 49+ Voice Presets 10 Languages	Elo 1,120 (Top Open-weights) Built on Qwen3-4B Backbone Inline Emotion Cues ([whisper], [laugh]) 80+ Languages Research License (Non-commercial Free)	245M Parameters (MIT) Matches Whisper Large-v3 1/6 the Size of Whisper Mobile & Embedded Ready CPU Capable	Service Discontinued (Dec 31, 2025) Team Absorbed into Meta Superintelligence Labs No Data Migration Path Migrate to: ElevenLabs, Chatterbox, Kokoro
Languages	5+	30+	74+	45+	99+ 🌍	20+	20+	20+	70+	9+	43+	25+	99+ 🌍	140+ 🌍	75+	11+	23+	9+	23+	10+	80+	1+	N/A
Compliance	—	SOC2HIPAA	SOC2HIPAAGDPR	HIPAASOC2	HIPAASOC2 Type 2ISO 27001:2022PCI DSS v4.0GDPR	—	—	—	GDPRSynthID Provenance	—	Azure ComplianceGDPRHIPAA	—	SOC2GDPR	SOC2HIPAAISO 27001GDPRFedRAMP	SOC2HIPAAISO 27001GDPR	—	—	—	—	—	—	—	—
Best For	voice agentcontent creationtranscription	voice agentcontent creationenterprise	content creationnarrationvoice agententerprise	voice agenttranscriptionanalyticsreal time	analyticstranscriptionunderstandingenterprise	voice agentreal time	content creationenterprise	content creationbudget	content creationnarrationenterprise	voice agentbudgetoffline	enterprisetranscriptionaccessibility	voice agentbudgetprototyping	simple appprototypingtranscriptionvoice agent	enterpriseaccessibilityglobal	enterpriseanalyticsaccessibility	voice agentcontent creation	budgetsimple app	budgetaccessibilityoffline	budgetcontent creationvoice agentoffline	budgetcontent creationaccessibility	content creationvoice agent	accessibilityofflinebudget	—

Data sourced from Artificial Analysis Speech Arena, HuggingFace Open ASR Leaderboard, and official provider documentation. All prices approximate as of July 2026. Benchmark scores may vary by use case.