Sold by: AssemblyAI
Deployed on AWS
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AssemblyAI builds AI systems that can understand human speech with superhuman abilities. Starting building with $50 in usage credits during your 90-day free trial. Cancel any time. After your trial ends, you will automatically be enrolled into an Assembly AI pay-as-you-go plan. Request a private offer for discounted pricing based on your usage profile.
Overview
AssemblyAI offers Speech AI models via an API that product teams and developers can use to build powerful AI solutions based on voice data. Thousands of developers build on AssemblyAI's Speech AI models every day to run Speech-to-Text on multilingual speech, and harness the power of Large Language Models to extract the full value from that voice data - including answering questions from voice data, generating content, and extracting metadata in seconds. AssemblyAI offers async transcription, with most audio files completing in well under 45 seconds regardless of audio duration, as well as real-time transcription with high accuracy and <600 ms of latency.
AssemblyAI gives you access to state-of-the-art Speech AI models and capabilities for real-world use cases, so you can build smarter applications in a fraction of the time. Models and features include:
- Speech recognition
- Speaker diarization
- Auto punctuation and casing
- Auto language detection
- Summarization
- Content moderation
- Sentiment analysis
- Auto highlights
- PII redaction
- Topic detection (IAB classification)
- Entity detection
- Auto chapters
- Custom spelling
- Custom vocabulary
- Dual channel transcription
- Export SRT or VTT caption files
- Filler word filtering
- Profanity filtering
In addition, LeMUR, which allows users to leverage the capabilities of Large Language Models, can quickly process audio transcripts for single or multiple audio files for tasks like summarization, question & answer, and AI coaching feedback.
Our Speech AI products support 33 different audio and video file types and 99+ languages. Our models are used by thousands of breakthrough startups and dozens of global enterprises for mission-critical workloads.
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Highlights
- Unparalleled Human-Level Accuracy: Our multilingual speech recognition AI models deliver industry-leading performance with the lowest word error rates on the market, outperforming competitors by over 60% when recognizing challenging content like rare words and proper nouns. Trusted by more than 3,000 innovative companies, including Zoom, our platform provides the foundation for mission-critical speech applications at scale.
- Built for enterprise-grade performance, our APIs deliver unmatched scalability for high-concurrency applications. Security is embedded with SOC 2 Type 2, PCI DSS, and GDPR compliance. For healthcare applications, AssemblyAI offers Business Associate Agreements (BAAs). Choose flexible hosting options in both US and EU regions.
- Comprehensive Audio Intelligence Suite: Our advanced models summarize conversations, identify speakers through diarization, analyze sentiment, moderate content, automatically redact PII, and much more, all in a single platform. Our LeMUR framework seamlessly connects spoken data with large language models, enabling unlimited possibilities for voice-powered applications.
Details
Features and programs
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Pricing
Free trial
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Pricing is based on the duration and terms of your contract with the vendor, and additional usage. You pay upfront or in installments according to your contract terms with the vendor. This entitles you to a specified quantity of use for the contract duration. Usage-based pricing is in effect for overages or additional usage not covered in the contract. These charges are applied on top of the contract price. If you choose not to renew or replace your contract before the contract end date, access to your entitlements will expire.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
Dimension | Description | Cost/month |
|---|---|---|
Pay As You Go | State-of-the-art production-ready AI models | $0.00 |
Slam_1_STT | Slam-1 speech-to-text (core) | $0.37 |
haiku3_5_input | Claude 3.5 Haiku 1k token input (LeMur) | $0.001 |
haiku3_5_output | Claude 3.5 Haiku 1k token output (LeMur) | $0.004 |
sonnet3_7_input | Claude 3.7 Sonnet 1k token input (LeMur) | $0.003 |
sonnet3_7_output | Claude 3.7 Sonnet 1k token output (LeMur) | $0.015 |
Dimension | Cost/unit |
|---|---|
Async Transcription (core) | $0.37 |
Nano Speech-to-Text (core) | $0.12 |
Real-Time Transcription (core) | $0.47 |
Auto Chapters (Audio Intelligence) | $0.08 |
Content Moderation (Audio Intelligence) | $0.15 |
Entity Detection (Audio Intelligence) | $0.08 |
Key Phrases (Auto Highlights) | $0.01 |
PII Redaction (Audio Intelligence) | $0.08 |
PII Audio Redaction (Audio Intelligence) | $0.05 |
Sentiment Analysis (Audio Intelligence) | $0.02 |
Vendor refund policy
All fees are non-refundable and non-cancellable except as required by law.
Legal
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Delivery details
Software as a Service (SaaS)
SaaS delivers cloud-based software applications directly to customers over the internet. You can access these applications through a subscription model. You will pay recurring monthly usage fees through your AWS bill, while AWS handles deployment and infrastructure management, ensuring scalability, reliability, and seamless integration with other AWS services.
Resources
Vendor resources
Support
Vendor support
Support is available via chat and email 24/7. support@assemblyai.com
AWS infrastructure support
AWS Support is a one-on-one, fast-response support channel that is staffed 24x7x365 with experienced and technical support engineers. The service helps customers of all sizes and technical abilities to successfully utilize the products and features provided by Amazon Web Services.
Customer reviews
Education Management
Easy to use, cheap and accurate
Reviewed on Jun 11, 2025
Review provided by G2
What do you like best about the product?
AssemblyAI speech to text API is really easy to use; I’m not a tech profile and I use it both with automation platforms (such as Zapier) and custom code.
It is cheap, for some use cases it cost almost anything! (For example: understand voicemail).
And, with latest model it is very accurate
It is cheap, for some use cases it cost almost anything! (For example: understand voicemail).
And, with latest model it is very accurate
What do you dislike about the product?
It will be perfect if in Zapier I can chose EU residency.
What problems is the product solving and how is that benefiting you?
Analyze very huge amount of data, impossible without technology
Leave a comment0 comments
Insurance
Analysis of conversations from our Customer Service and Sales
Reviewed on Jun 09, 2025
Review provided by G2
What do you like best about the product?
We use AssemblyAI to transcribe WhatsApp audios and calls to analyze the conversations with another AI.
What do you dislike about the product?
I have no negative comments about the tool.
What problems is the product solving and how is that benefiting you?
call analysis, audio analysis, to validate the quality of technical support
Fábio G.
CallCenter transcribe calls
Reviewed on Jun 02, 2025
Review provided by G2
What do you like best about the product?
Precision and confidence are great for my use.
What do you dislike about the product?
Some features are not available for my language (pt_BR)
What problems is the product solving and how is that benefiting you?
Recognize problems in phone calls without listening to all recordings
Consulting
API is amazing for quick implementation. Cost is very reasonable.
Reviewed on Jun 02, 2025
Review provided by G2
What do you like best about the product?
Ease of implementation. Did not encounter any issues so far. Response is fairly faster than whisper speech to text.
What do you dislike about the product?
Difficulties with multiple speech detection with people with English accent. I wish there was a calibration feature for individual voice.
What problems is the product solving and how is that benefiting you?
I use it for notes recording and conversations. Easy to record whole length of conversation and apply backend algorithm to brief the conversation details due to accuracy of recording.
Dave G.
Great Trial period | Easy API to Work with | Accurate transcription
Reviewed on Jun 02, 2025
Review provided by G2
What do you like best about the product?
- Easy to configure due to good documentation
- I am not a developer but figured it out
- Integrated into N8N for my automation
- Nano model is very cost effective
- Great speaker detection
- I am not a developer but figured it out
- Integrated into N8N for my automation
- Nano model is very cost effective
- Great speaker detection
What do you dislike about the product?
- Took a little testing to get my settings correct but good documentation helped
- Works flawlessly once I got off free level, I was throttled before that but understandable due to free account
- Works flawlessly once I got off free level, I was throttled before that but understandable due to free account
What problems is the product solving and how is that benefiting you?
I wanted to have clear speaker identified from my wav files that are recorded in my CRM/ATS. I wanted an automation when i drop a file in a folder to return a transcription to the same folder. N8N and assemblyAI made this possible.