What does Speechmatics do?

Speechmatics provides speech technology and Voice AI for enterprises, offering accurate Speech-to-Text, Text-to-Speech, and Voice Agent solutions. Our models understand every voice and accent across 53+ languages, helping businesses unlock the full potential of voice data.

How accurate is Speechmatics Speech-to-Text?

Speechmatics delivers best-in-market accuracy, achieving up to 99% word accuracy and 96% medical keyword recall in industry benchmarks. Our models handle multiple accents, noisy environments, and multi speakers with ease.

What makes Speechmatics Text-to-Speech different?

Our low-latency Text-to-Speech (TTS) delivers lifelike, human-sounding voices with sub-150ms latency that is ideal for real-time conversations. Developers can stream natural speech in multiple voices and deploy it in the cloud, hybrid, or on-prem for privacy and control.

Can I build real-time voice agents with Speechmatics?

Our voice AI enables developers to build real-time voice agents that listen, understand, and respond naturally. Plug in fast with a flexible API and native integrations to power your AI voice agents.

Which industries use Speechmatics?

Speechmatics is trusted by organizations in media, healthcare, contact center, finance, education, and accessibility. Our technology powers transcription, translation, call analytics, and voice AI applications worldwide.

Speechmatics vs OpenAI: Which Speech-to-Text API Delivers?

Speechmatics delivers production-ready speech-to-text with real-time streaming, built-in speaker diarisation, and enterprise deployment — on-premises, on-device, and air-gapped — that OpenAI's transcription API cannot match.

[alt: Speech-to-text software interface with command examples on a dark screen, logos of VAPI, Pipecat, and LiveKit above.]

See how Speechmatics compares vs OpenAI on your audio

Choose from live radio, your own voice, or sample audio to see side-by-side comparisons of Speechmatics vs OpenAI.

Why enterprises choose Speechmatics over OpenAI

Real-Time + Diarisation

Real-time streaming with diarisation included

Speechmatics delivers low-latency real-time transcription with speaker diarisation included at no extra charge. OpenAI's transcription models do not provide native speaker diarisation, and Whisper is batch-oriented — a gap for voice agents and live call analytics.

Enterprise Deployment

On-prem, on-device, air-gapped

Speechmatics runs on-premises, on-device, and fully air-gapped. OpenAI transcription is available only as a hosted cloud API, with no managed on-prem or air-gapped option — a blocker for regulated and data-sensitive workloads.

Data Control

Your data, your environment

Keep audio and transcripts entirely within your own infrastructure. With OpenAI's API, audio is processed in OpenAI's cloud.

Speechmatics vs OpenAI: Feature-by-feature comparison

A detailed look at how the two platforms stack up across core capabilities, deployment options, and verified public reviews.

Feature	Speechmatics ★	OpenAI
Flagship Model	Ursa 2 (Standard and Enhanced Accuracy)	Whisper large-v3 (open-source) / gpt-4o-transcribe (API)
Supported Languages	53+ production-proven languages	~99 claimed (many low quality in practice)
Real-Time Streaming	✓ Yes, low latency	✗ None (Whisper); Via Realtime API, weaker on short utterances (GPT-4o Transcribe)
Real-Time Speaker Diarisation	✓ Yes, included at no extra charge	✗ None
Custom Dictionary	1,000 words (included at no extra charge)	✗ None — requires model fine-tuning (Whisper); Prompt-based hints only (GPT-4o Transcribe)
On-Premises Deployment	✓ Mature, production-ready	✗ Hosted API only
On-Device Deployment	✓ Yes	Open-source model can be self-hosted (you run the GPUs); gpt-4o-transcribe is API-only
Air-Gapped Deployment	✓ Yes	✗ No (managed API)
Data Residency Control	✓ In your environment	API-only; audio processed on OpenAI servers
Pricing Model	Simple per-hour, all-inclusive	$0.36/hr (Whisper API); $0.36/hr ($0.18/hr Mini) (GPT-4o Transcribe)
ISO 27001 / SOC2 / HIPAA / GDPR	✓ All four	SOC 2 Type II ✓; HIPAA (via BAA) ✓; GDPR ✓; ISO 27001 ✗

Where Speechmatics outperforms OpenAI

Real-Time ASR | Enterprise Differentiation | Competitive Positioning

Native speaker diarisation

Know who said what in real time. OpenAI's transcription models don't offer built-in speaker diarisation; Speechmatics includes it at no extra charge.

Purpose-built real-time streaming

Low-latency streaming designed for live captioning, voice agents, and call analytics.

Enterprise deployment

On-premises, on-device, and air-gapped — options OpenAI's hosted API does not provide.

Data residency & control

Process audio entirely within your own environment for compliance-sensitive use cases.

Production STT features

Custom dictionary, formatting, punctuation, and language controls built for production pipelines.

Enterprise support & SLAs

Dedicated speech specialists and contractual SLAs, rather than general developer-platform support.

Start building with Speechmatics today

1) 👤 Log in or signup to the Speechmatics Portal

2) 💳 Add a valid payment card (no charge until credit is used)

3) 🔑 Enter your code: SWITCH200

4) 🚀 Start building with $200 free credit

Frequently Asked Questions: Speechmatics vs OpenAI

Does OpenAI's transcription API support speaker diarisation?

As of writing, OpenAI's transcription models do not provide native speaker diarisation. Speechmatics includes real-time speaker diarisation at no extra charge.

Can I run Speechmatics on-premises or air-gapped, unlike OpenAI?

Yes. Speechmatics offers on-premises, on-device, and fully air-gapped deployment. OpenAI transcription is only available as a hosted cloud API.

Does Speechmatics support real-time streaming transcription?

Yes — low-latency real-time streaming with diarisation included.

What about data privacy and residency?

Speechmatics lets you process audio entirely within your own infrastructure.

How many languages does Speechmatics support?

Speechmatics supports 53+ production-proven languages with strong accent handling.

Is Speechmatics more accurate than Whisper / gpt-4o-transcribe?

Speechmatics is trained on over a million hours of noisy, accented, real-world audio and tuned for difficult production conditions.

Is Speechmatics enterprise- and compliance-ready?

Yes — ISO 27001, SOC 2, HIPAA, and GDPR, with dedicated enterprise support and SLAs.

Ready to switch to superior speech-to-text?

Join thousands of developers building the future of voice with Speechmatics. Get $200 in free credits when you sign up today.

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[alt: Vapi integration launch blog social asset]

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