AssemblyAI
Voice AI infrastructure for builders
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Last confirmed: against assemblyai.com. Information may have changed since then; check the vendor before you buy. How we check.
Compiled from public sources, not a hands-on review. We don't publish ratings or scores.
AssemblyAI provides production-ready Voice AI infrastructure for developers, featuring speech-to-text, streaming transcription, guardrails, and voice agent APIs. The platform handles complex audio processing tasks such as language detection, formatting, speaker identification, and medical transcription. It operates on a pay-as-you-go usage pricing model alongside a free trial signup option, with enterprise custom configurations available. Users can integrate these capabilities across various applications through its comprehensive developer API.
- Works on:
- Web, API
What AssemblyAI costs
As printed on assemblyai.com on August 31, 2026
Figures are copied from the vendor's own pricing page, never calculated or converted, and a tier we could not confirm is left out rather than estimated. Pricing changes without notice. Check assemblyai.com before you buy ↗
What changed
All tracked changes →AssemblyAI added the Free plan at free.
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AssemblyAI added the Pro plan at $0.21.
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AssemblyAI added the Enterprise plan at custom pricing.
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AssemblyAI added the Pay as you go plan at custom pricing.
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AssemblyAI added the Custom plan at custom pricing.
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Recorded when a weekly re-read of the vendor's pages finds a tracked figure has moved. It says what the pages showed on two dates and nothing about why.
Compare AssemblyAI
Ordered by how often each comparison is searched, taken from Google's autocomplete suggestions. Pricing on both sides comes from the vendors' own pages.
All AssemblyAI alternatives
A tool we have an affiliate relationship with. Not a recommendation over AssemblyAI.
- Repurposing podcast and video recordings into social posts, newsletters, and blogs
- Content teams and agencies managing multi-brand client media pipelines
- Transcribing and summarizing meetings, webinars, and sales calls
What AssemblyAI does well
- ✓ Building real-time voice agents
- ✓ Transcribing pre-recorded audio files with high accuracy
- ✓ Performing call analytics and medical transcription
Key features
- Pre-recorded and real-time streaming speech-to-text transcription
- Speaker diarization to segment utterances by speaker
- LLM-powered Speech Understanding and LLM Gateway
- Custom keyterms prompting and Medical Mode for specialized terminology
People also ask
What models does AssemblyAI offer for transcription? +
AssemblyAI offers flagship models such as Universal-3.5 Pro for both async and realtime audio, as well as Universal-2 supporting 99 languages.
What additional features are available for speech-to-text APIs? +
Available add-ons include keyterms prompting, plain language prompting, speaker diarization, and an optimized Medical Mode.
How can I deploy AssemblyAI models? +
AssemblyAI supports deployment options through its Voice AI Cloud as well as self-hosted infrastructure.
Is AssemblyAI free? +
Yes. AssemblyAI has a free plan. Paid plans start at $0.02 usage-based.
How much does AssemblyAI cost? +
AssemblyAI lists 11 plans: Free, Speaker Diarization at $0.02 usage-based, Keyterms Prompting at $0.05 usage-based, Prompting at $0.05 usage-based, Universal-2 at $0.15 usage-based, Medical Mode at $0.15 usage-based, Universal-3.5 Pro at $0.21 usage-based, Pro at $0.21 usage-based, Pay as you go (custom pricing), Custom (custom pricing), Enterprise (custom pricing).
What platforms does AssemblyAI run on? +
AssemblyAI runs on Web, API.
At a glance
- Pricing model
- freemium
- Category
- audio
- Website
- assemblyai.com ↗
- Featured on
- Capabilities
- speech-to-text transcription speaker-identification developer-api
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