What can AssemblyAI do?

AssemblyAI transforms audio processing through several key capabilities, including real-time transcription with adaptive noise filtering, multi-speaker detection and voice separation, semantic understanding and topic classification, sentiment analysis and emotion detection, custom vocabulary training for industry-specific terminology, and scalable API infrastructure for enterprise deployment.

What languages does AssemblyAI support?

AssemblyAI offers two different speech-to-text models: Slam-1, which supports English only, and Universal, which supports 99 languages.

What is the pricing model?

AssemblyAI operates on a Pay-As-You-Go model. Pricing for pre-recorded audio is based on the duration of the audio file submitted and the speech model selected. A generous free plan is available for getting started.

What are the concurrency limits?

Free accounts have default limits, such as up to 5 concurrent asynchronous transcription jobs. Paid plans can scale significantly, and AssemblyAI offers custom concurrency limits at no additional cost by contacting their support or sales teams.

What audio and video file types are supported?

This is listed as a popular FAQ topic, though specific file formats are available in the AssemblyAI documentation.

Are there limits on file size or duration?

File size and duration limits are documented in the FAQ, with specifics available in their documentation portal.

How does AssemblyAI handle multilingual audio?

The API can handle files containing spoken audio in multiple languages, with processing capabilities depending on the selected speech model.

How do I get an AssemblyAI API Key?

To get started, you need to sign up for a free account on the AssemblyAI website and obtain your API key from the developer dashboard. The platform supports standard API key authentication for all integrations.

Does AssemblyAI offer Zero Data Retention?

This is addressed in their Privacy & Security FAQ section, with details available in their documentation.

What are common applications?

Content creators and media companies use AssemblyAI to automatically generate accurate transcripts and summaries of podcasts, interviews, and video content, with speaker diarization identifying who said what. Legal and compliance teams deploy AI agents to monitor recorded meetings and calls for specific keywords and regulatory risks.

AssemblyAI

4.3

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AssemblyAI offers powerful AI models to accurately turn spoken audio into text and understand its content. It provides real-time transcription, speaker identification, and multilingual support, helping businesses quickly build and scale advanced voice AI applications.

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Free Option

Overview Features Use Cases FAQ Pricing

About AssemblyAI

Who It's For

This tool is for developers and businesses that build AI products using spoken audio. It's perfect for voice agents, AI notetakers, or detailed conversation analysis. Any company, big or small, can use it for various industry needs.

What You Get

You get highly accurate text from live or recorded speech. The tool pinpoints speakers, detects emotions, and identifies key topics. It also supports 99 languages automatically and allows custom vocabularies, offering rich insights from voice data.

How It Works

AssemblyAI uses powerful AI models through an easy API. Just sign up for a free account to get your API key. It works on a pay-as-you-go basis. You only pay for what you use, which lets you easily scale up your audio processing without complex contracts.

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Features & Capabilities

🎙️ Core Speech Transcription

Batch Speech-to-Text

Accurately transcribes prerecorded audio and video files to unlock insights from voice data.

Real-time Streaming Transcription

Provides ultra-low latency, high-accuracy speech-to-text for live audio streams with precise controls.

Multilingual Speech Recognition

Offers ultra-fast and accurate real-time transcription across multiple languages globally, with automatic language detection.

🧠 Advanced Audio Intelligence

Speech Understanding Models

Utilizes sophisticated AI models to enable deep analysis and extract high-value insights from audio.

Speaker Diarization

Correctly identifies and separates different speakers within a single audio recording.

Automatic Text Formatting

Automatically formats transcribed text and alphanumerics for improved readability and clarity.

Use Cases

Enhancing Conversation Intelligence for Sales & Support

Businesses struggle to extract actionable insights from customer interactions, impacting sales performance and support quality. AssemblyAI's speech-to-text and speech understanding models automatically transcribe and analyze customer calls and meetings, providing valuable data on sentiment, topics, and speaker behavior to improve strategies and outcomes.

B2B SaaSFor: Sales Teams

Automating Meeting Summarization and Note-Taking

Professionals spend significant time on manual note-taking during meetings, often missing key details. AssemblyAI's AI notetakers transcribe spoken content, identify speakers, and generate concise summaries, allowing users to focus on discussions and ensuring comprehensive records for follow-up and knowledge management.

General BusinessFor: Knowledge Workers

Developing Intelligent Real-time Voice Agents

Building effective, natural-sounding voice assistants and interactive voice response (IVR) systems is challenging due to latency and accuracy limitations. AssemblyAI's ultra-low latency Streaming Speech-to-Text and Speech Understanding capabilities enable developers to create highly accurate and responsive voice agent workflows for dynamic customer interactions.

Contact CentersFor: AI Engineers

Streamlining Content Transcription and Analysis for Media

Media companies and content creators face the challenge of accurately transcribing and extracting insights from large volumes of audio and video content. AssemblyAI provides accurate speech-to-text with speaker diarization and summarization, automating the production of transcripts for podcasts, interviews, and videos to enhance accessibility and content repurposing.

Media & EntertainmentFor: Content Creators

Ensuring Compliance Monitoring in Regulated Industries

Legal and compliance teams must monitor extensive recorded communications for regulatory adherence and risk detection, a task impossible to do manually at scale. AssemblyAI's AI agents automatically transcribe and analyze recorded meetings and calls, flagging specific keywords, sentiment, and topics to ensure compliance and mitigate risks.

Financial ServicesFor: Compliance Officers

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AssemblyAI

About AssemblyAI

Who It's For

What You Get

How It Works

Stay in the loop

Give your AI a memory

Features & Capabilities

🎙️ Core Speech Transcription

🧠 Advanced Audio Intelligence

Use Cases

Enhancing Conversation Intelligence for Sales & Support

Automating Meeting Summarization and Note-Taking

Developing Intelligent Real-time Voice Agents

Streamlining Content Transcription and Analysis for Media

Ensuring Compliance Monitoring in Regulated Industries

Frequently asked questions

What can AssemblyAI do?

What languages does AssemblyAI support?

What is the pricing model?

What are the concurrency limits?

What audio and video file types are supported?

Are there limits on file size or duration?

How does AssemblyAI handle multilingual audio?

How do I get an AssemblyAI API Key?

Does AssemblyAI offer Zero Data Retention?

What are common applications?

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Specifications

Pricing

Free Tier

Universal Pre-recorded Speech-to-Text (Pay-as-you-go)

Universal Pre-recorded Speech-to-Text (Custom)

Slam-1 Beta Pre-recorded Speech-to-Text (Pay-as-you-go)

Universal-Streaming Speech-to-Text (Pay-as-you-go)

Universal-Streaming Multilingual Speech-to-Text (Pay-as-you-go)

Keyterms Prompting Add-on (Pay-as-you-go)

Universal-Streaming Speech-to-Text (Custom)

Speaker Identification (Speech Understanding)

Translation (Speech Understanding)

Custom Formatting (Speech Understanding)

Entity Detection (Speech Understanding)

Sentiment Analysis (Speech Understanding)

Auto Chapters (Speech Understanding)

Key Phrases (Speech Understanding)

Topic Detection (Speech Understanding)

Summarization (Speech Understanding)

Speech Understanding (Custom)

Profanity Filtering (Guardrails)

PII Audio Redaction (Guardrails)

PII Redaction (Guardrails)

Content Moderation (Guardrails)

Guardrails (Custom)

GPT-5 LLM

GPT-5-Mini LLM

GPT-5 Nano LLM

GPT 4.1 LLM

gpt-oss-20b LLM

gpt-oss-120b LLM

ChatGPT-4o LLM

Gemini 2.5 Flash Lite LLM

Gemini 2.5 Flash LLM

Gemini 2.5 Pro LLM

Claude 4.5 Sonnet LLM

Claude 4.5 Haiku LLM

Claude 4 Sonnet LLM

Claude 4 Opus LLM

Claude 3.5 Haiku LLM

Claude 3 Haiku LLM

LLM Models (Custom)

Links

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