Sold by: AssemblyAI
Deployed on AWS
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 AssemblyAI pay-as-you-go plan. Request a private offer for discounted pricing based on your usage profile.
4.3
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 two of the world's most powerful and accurate async transcription models, as well as real-time transcription with ultra high accuracy, low latency, and built-in turn detection.
AssemblyAI gives you access to state-of-the-art Speech AI models and capabilities for real-world use cases with unlimited concurrency and no upfront contract commitment, so you can build smarter applications in a fraction of the time. Models and features include:
- Speech recognition
- Keyterms prompting for streaming
- Auto language detection
- Translation
- Speaker diarization and identification
- Auto punctuation and casing
- Custom formatting
- Custom spelling
- Custom vocabulary
- Guardrails, including Content Moderation, PII Redaction, and Profanity Filtering
- Filler word filtering
- Summarization
- Sentiment analysis
- Auto highlights
- Topic detection (IAB classification)
- Entity detection
- Auto chapters
- Dual channel transcription
- Export SRT or VTT caption files
In addition, LLM Gateway allows you to connect speech-to-text outputs directly to your preferred leading LLM provider through a single, unified API for tasks like output fine-tuning, 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.
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 Speech Understanding Suite and Guardrails: 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 LLM Gateway seamlessly connects spoken data with your preferred large language models, enabling unlimited possibilities for voice-powered applications in one unified platform.
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Dimension | Description | Cost/unit |
|---|---|---|
Universal-2 | Fast, intelligent async transcription with exceptional accuracy and unlimited concurrency | $0.15 |
SLAM-1 (deprecated) | Highest accuracy transcription powered by LLM intelligence | $0.27 |
Universal Streaming | Fast, accurate real-time transcription. Built-in turn detection and unlimited concurrency | $0.15 |
Keyterms Prompting (Universal Streaming) | Improve recognition accuracy for specific words and phrases | $0.04 |
Speaker Identification | Identify speakers by their actual names and roles | $0.02 |
Translation | Automatically convert your transcribed audio content from one language to another | $0.06 |
Custom Formatting | Ensure consistency through automatic, standardized formatting | $0.03 |
Entity Detection | Identify entities like person and company names, email addresses, dates, and locations | $0.08 |
Sentiment Analysis | Detect the sentiment of each sentence of speech spoken in your audio files | $0.02 |
Auto Chapters | Automatically generate a summary over time for audio and video files | $0.08 |
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All fees are non-refundable and non-cancellable except as required by law.
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Support
Vendor support
Support is available 24/7 via chat on our website at <www.assemblyai.com > or email at support@assemblyai.com .
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Customer reviews
reviewer2846073
Real-time transcription has powered accurate culture scoring for diverse workplace meetings
Reviewed on May 30, 2026
Review from a verified AWS customer
What is our primary use case?
My main use case for AssemblyAI is meeting and interview transcriptions. We are a culture operating system, so we track organization culture. Our bot joins the meetings of employees, and we convert the calls, interviews, or meetings into text. AssemblyAI supports our async and real-time transcription, and when we have the text, we pass it through our internal LLM to create culture scores.
What is most valuable?
The best features AssemblyAI offers are transcription and real-time transcriptions. The speed of real-time transcription stands out to me because it's 20 to 40% faster than the industry benchmark, so speed is definitely one of the pros of AssemblyAI.
AssemblyAI has positively impacted my organization by being a fundamental part of our main use flow, where our bot joins the meetings and transcribes them into text. Once the text is generated, it goes to our internal LLM to get culture scores, making it one of the main fundamental parts of our product.
What needs improvement?
AssemblyAI could be improved because when we have different accents on the same call, it usually fails, especially when we have American, Asian, and Latin American speakers on the same call, making the transcriptions a bit noisy.
The transcription quality of non-native English speakers should be improved. I choose nine out of ten because it's really good and fast, working well when there is an English speaker on the call, so the quality of the transcription is really good. Latency is almost zero, and it's 20 to 40% faster than the industry benchmarks. I only rate it as nine because it lacks accent detection and the quality for different accents.
For how long have I used the solution?
I have been using AssemblyAI for a year now.
How are customer service and support?
Regarding AssemblyAI's governance and security, I think it's pretty much secure since we have all the SOC 2 and SOC 1 reports from the security team of AssemblyAI.
Which solution did I use previously and why did I switch?
We were using Deepgram and other AI tools for real-time transcription, but AssemblyAI has actually reduced the latency by 40%, which is a huge win for us because now we can process the results much faster than we used to in the past.
Which other solutions did I evaluate?
My advice for others looking into using AssemblyAI is that there are other market players as well. It depends; if your target customers are from an English-speaking country, AssemblyAI is one of the best products out there. If your target customers are not in an English-speaking country, there are other options that you should consider, depending on your geographic location.
What other advice do I have?
If your target audience is English speakers, then AssemblyAI's accuracy and reliability of output is 100%, as it's one of the best. The main improvement we need in our workflow is accent detection because other than that, it's pretty much straightforward. I rate this product nine out of ten.
Which deployment model are you using for this solution?
Private Cloud
If public cloud, private cloud, or hybrid cloud, which cloud provider do you use?
Khemit Verma
Accurate transcripts with clear grammar have supported reliable speaker-based dialogue analysis
Reviewed on Apr 03, 2026
Review provided by PeerSpot
What is our primary use case?
I use AssemblyAI only with audio files, not for real-time transcription. I mainly use only US English, and I have not tried other languages. I upload audio files through AssemblyAI API, and they provide the transcription script with speaker identification and the dialogues.
What is most valuable?
The main features I appreciate in AssemblyAI are that it provides better accuracy compared to other transcription services, with clear grammar and no errors in spelling mistakes or grammatical mistakes, delivering clear transcription.
The primary benefit I receive from their product is much more accurate transcription. First, it is a very affordable service, and second, the accuracy is much better compared to other services such as Deepgram or AWS transcription services, which are the main benefits. Third, the speaker identification capability is better.
What needs improvement?
A few drawbacks I observed in the speaker identification are that in some videos where text and names appear on the video frames, AssemblyAI does not identify the actual speaker name, instead providing generic names such as Speaker A, Speaker B, Speaker C, or Speaker X, Y, Z.
AssemblyAI does not identify the real speaker in some audio or video files, just sending Speaker A, Speaker B, or Speaker C. They are not easily identifying speakers in some instances.
AssemblyAI does not provide a cloud service; I simply upload the audio file to the API, and they store it somewhere internally to send me the transcription text.
For additional functions, the API does not provide video uploading functionality, and I need to convert video to audio first before uploading it to AssemblyAI.
For how long have I used the solution?
I have been working with AssemblyAI for approximately one year.
How are customer service and support?
AssemblyAI should respond more quickly because when I post a ticket, they take too much time to respond to it.
Which solution did I use previously and why did I switch?
I did not continue working with Deepgram after trying it, but I recently started using AssemblyAI because Deepgram does not provide accurate transcription. I chose AssemblyAI because I did not use Deepgram again.
How was the initial setup?
I only need to create an account on AssemblyAI, and initially, they provide some credits for transcription, which is enough initially. However, if usage increases, I can purchase a subscription from there.
What's my experience with pricing, setup cost, and licensing?
I think the price for the product is a seven.
Which other solutions did I evaluate?
I can compare AssemblyAI with Deepgram. I would choose only AssemblyAI instead of Deepgram when comparing both products. The main reason I chose it is that it is far better compared to Deepgram regarding speaker identification, the clear verbatim process, and the time-stamp process, providing accurate time-stamping and the dialogues.
If I compare AssemblyAI with other services such as Gameloop, ChatAI, and Deepgram, the accuracy is far better, always maintaining the grammar and providing good, accurate text for audio or video files.
What other advice do I have?
The AssemblyAI noise filtering feature exists, but I did not use that feature. I use the existing API where I upload the audio to AssemblyAI, and after a few seconds or minutes, I continuously check if the transcription is done. Once it is done, I pass the transcription text into a file and generate an SRT file, a text file, and a doc file.
It works fine with different accents.
I rate this product an overall 8 out of 10.