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AssemblyAI

by AssemblyAI •Voice & Speech Platforms

Speech AI API platform for batch and real-time transcription, diarization, audio intelligence and LLM workflows.

PricingFree + Usage-based Profile coverage78% PlatformsAPI CompanyAssemblyAI
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Overview

What is AssemblyAI?

AssemblyAI is a developer-focused Speech AI platform for pre-recorded and real-time transcription, speaker diarization, language detection, keyterm prompting, audio intelligence and LLM workflows. It uses pay-as-you-go API pricing across multiple speech models and offers enterprise rate limits and deployment flexibility. AssemblyAI also supports self-hosted Voice AI deployments for organizations that need audio processing inside their own environment.
Best for
VoiceoversTranscription
Decision intelligence

AI Orbit decision brief

A compact reading of the recorded evidence, editorial review signals and comparison data for AssemblyAI.

Why it stands out

Recorded strengths

API access

Verified profile evidence records API access for this tool.

Source-backed capability Source
Self-hosting support

Verified deployment evidence records self-hosting support.

Source-backed capability Source
Enterprise access controls

Verified security evidence records SSO / SAML availability.

Source-backed capability Source
Recorded security certifications

Verified security evidence records SOC 2 Type 2.

Source-backed capability Source
Capabilities0/4 verified
Use-case fit0/2 verified
Pricing evidence5/5 plans checked
Verified sources3
Benchmarks1 verified

Built from AI Orbit's recorded profile data. Unknown product facts are not inferred.

Capabilities

Features & use cases

Core capabilities listed for AssemblyAI.

Audio Understanding

Analyzes speech, sound, music or other audio inputs.

Source review in progress Source

Speech to Text

Transcribes spoken audio into text.

Source review in progress Source

API Access

Provides programmatic API access for application integration.

Source review in progress Source

Real-time Streaming

Supports low-latency streaming text, audio or multimodal interactions.

Source review in progress Source
API #Developer Focused#API First#Multilingual
Technical profile

Access, deployment & licensing

Structured product facts with evidence status. Unknown facts are never guessed.

Open source & license

Source check pending

Proprietary

Commercial use

Source check pending

Commercial use allowed

Trust intelligence

Privacy, security & compliance

Provider policies and certifications are shown only when recorded with evidence.

Data training policy

Training use with opt-out / controls

Zero data retention can be enabled so processed audio and transcripts are not stored after processing; additional metadata may still be kept for logging and billing. Verified fact Privacy source
Privacy: AssemblyAI allows customers to opt out of model training and provides zero-data-retention controls. Training use does not apply to opted-out data, European-server data or data covered by a BAA under its published rules.
Security: AssemblyAI maintains SOC 2 Type 2 controls, TLS 1.2+ and AES-256 encryption, role-based access and SSO, annual penetration tests and self-hosted deployment options.
Recorded assurances
SOC 2 Type 2GDPR
Pricing

Pricing overview

Pricing stored in AI Orbit's pricing database. Always verify final rates on the provider website.

AssemblyAI

Pay as you go

Usage-based

Speech-to-text starts around $0.21/hour; model/features vary

Stale · verified 1 month ago

AssemblyAI

Universal-2 Pre-Recorded

Usage-based

$0.15/hour pay-as-you-go.

Review · verified 2 weeks ago

  • Pre-recorded speech-to-text
  • billed to actual duration.
AssemblyAI

Universal-3.5 Pro Pre-Recorded

Usage-based

$0.21/hour pay-as-you-go.

Review · verified 2 weeks ago

  • Higher-accuracy async speech-to-text.
AssemblyAI

Universal-3.5 Pro Realtime

Usage-based

$0.45/hour pay-as-you-go.

Review · verified 2 weeks ago

  • Realtime speech-to-text for voice-agent workloads.
AssemblyAI

Free

Free

Stale · verified 1 month ago

  • Free usage allowance applies.
View full AssemblyAI pricing, plans & price history
Evidence-separated performance

Verified benchmarks & scores

AI Orbit keeps technical tests, product-experience evidence and independent research in separate semantic classes. Only comparable results may contribute to the same composite.

Unclassified

Evidence not yet safe to place in a comparable benchmark class; excluded from universal composites.

Evidence only
Speech Recognition Unclassified Verified Independent

Coval/Openbenchmarks Live STT — Average WER

Tested product / versionuniversal-3.5-pro
3.2 % WER
#1 of 2
Same-benchmark rank#1 of 2 tools
Scoring directionLower is better
Leader context Current verified leader
TestedAug 28, 2026
Coval / Openbenchmarks AI Orbit verified Aug 28, 2026
Alternatives

Evidence-based similar tools

Ranked by use-case, capability, pricing, platform, taxonomy and compatible benchmark overlap—not popularity alone.

Make a confident choice

Is AssemblyAI right for your workflow?

Compare features, pricing and alternatives before you decide.

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Common questions

AssemblyAI FAQ

Quick answers based on the information currently available in this AI Orbit profile.

What is AssemblyAI?

AssemblyAI is a developer-focused Speech AI platform for pre-recorded and real-time transcription, speaker diarization, language detection, keyterm prompting, audio intelligence and LLM workflows. It uses pay-as-you-go API pricing across multiple speech models and offers enterprise rate limits and deployment flexibility. AssemblyAI is provided by AssemblyAI and AI Orbit categorizes it under Voice & Audio. Its structured capability profile includes Audio Understanding, Speech to Text, API Access and Real-time Streaming; field-level verification may still be pending for some capability mappings.

Who makes AssemblyAI?

AssemblyAI is provided by AssemblyAI. AI company providing speech-to-text, audio intelligence and voice understanding APIs for developers. Within AI Orbit, the product is cataloged in Voice & Audio, which describes its primary product category rather than the provider itself.

What is AssemblyAI best for?

AI Orbit currently maps AssemblyAI to structured use cases including Voiceovers and Transcription. These are reviewed taxonomy mappings used for discovery and fit; field-level evidence may still be pending, so they are not presented as independently verified claims. Supporting cataloged capabilities include Audio Understanding, Speech to Text, API Access and Real-time Streaming.

Does AssemblyAI have an API?

Yes. AI Orbit has verified official evidence that AssemblyAI provides API access. The profile also records official API documentation, so developers can check supported endpoints, authentication and current implementation details at the provider source. API availability can change independently from the consumer product, so production implementations should still be checked against the provider documentation.

Can AssemblyAI be self-hosted?

Yes. Verified deployment evidence shows that AssemblyAI supports self-hosting. Documented deployment modes include API, Cloud and Self-hosted. Deployment rights, infrastructure requirements and enterprise restrictions should be checked against the provider documentation before production use.

How does AssemblyAI handle privacy and security?

AssemblyAI allows customers to opt out of model training and provides zero-data-retention controls. Training use does not apply to opted-out data, European-server data or data covered by a BAA under its published rules. AI Orbit records the data-training policy as: Training use with opt-out / controls. AssemblyAI maintains SOC 2 Type 2 controls, TLS 1.2+ and AES-256 encryption, role-based access and SSO, annual penetration tests and self-hosted deployment options. Verified security certifications listed on the profile include SOC 2 Type 2.

How much does AssemblyAI cost?

AI Orbit currently has verified plan-level pricing data for AssemblyAI, including Pay as you go, Universal-2 Pre-Recorded, Universal-3.5 Pro Pre-Recorded and Universal-3.5 Pro Realtime. Exact rates, billing units, limits and verification dates are shown in the pricing section of this profile rather than compressed into a single potentially misleading price. Because providers can change prices and plan limits, check the linked official pricing source before making a purchase or production decision.