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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Pricing
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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Software as a Service (SaaS)
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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
Natural voice calls have transformed how our customers converse with automated agents
What is our primary use case?
My main use case for AssemblyAI was for a voice-based calling system that we created.
A specific example of how I used AssemblyAI in my voice-based calling system is that it was used for the text-to-speech part and also speech-to-text. For speech-to-text, I don't remember if we also used something else, but for text-to-speech, we definitely relied on AssemblyAI because the voices were significantly better.
I don't have anything else to add about my use case with AssemblyAI.
What is most valuable?
The best features AssemblyAI offers include a large selection of voices and an intuitive dashboard where we could customize and tweak things according to what we needed.
When I mention customizing and tweaking things, it was a mix of all aspects, and I could also change the AI model behind it.
AssemblyAI has impacted my organization positively, not in the current organization, but in the previous organization. Because of AssemblyAI, we were able to envision something that could speak naturally to mass consumers.
That natural-sounding speech impacted our customers because users couldn't tell if it was AI, and even if they could, they could still have a natural conversation.
What needs improvement?
AssemblyAI can be improved in several areas. I don't remember if AssemblyAI had a webhook, but if they have one, that's beneficial. The biggest improvement I think was the lack of background sound. If AssemblyAI doesn't have this feature anymore, but suppose we have a use case where a customer support representative is talking to an actual customer, for it to actually sound natural, perhaps a dim office workspace background would be nice. This would give it a much more natural feel instead of a very silent background, which feels very artificial.
Regarding AssemblyAI's AI capabilities, I have no idea about its governance and security. I would really like to know if it is compliant with Saudi PDPL. A feature I would want AssemblyAI to have is to cater to the MENA region and the Middle East market. There's a law in Saudi called PDPL, Personal Data Privacy Law, and that dictates that all the data should remain within the Kingdom or within GCC and all the processing should happen there. If AssemblyAI could offer some feature or some way to ensure that the hosting is being done within maybe GCP Dammam or AWS in the GCC, or the cloud providers that reside here, and the physical data centers that are being used are of the GCC for our entire processing, that would make it so much more feasible to be used within organizations in Saudi.
Regarding AssemblyAI's AI capabilities, I can't think much about its accuracy and reliability of output because I think the AI is of a third party that is connected. I don't know if AssemblyAI has any LLM that does the reasoning. So I don't think it's fair to say it's AssemblyAI's capability.
For how long have I used the solution?
I used AssemblyAI for one and a half years, but I haven't been using it for a year now.
What other advice do I have?
I would say to others looking into using AssemblyAI that it's a good start and it's very easy. They should start by first using the dashboard and trying it out instead of jumping into integrations to see if it best fits their use case. I would rate my overall experience with AssemblyAI an 8 out of 10.
Error-Free Transcripts and Higher-Quality Editing
Saves Hours on Call Checks and Helps Keep Customer Service on Target
Story workflows have become faster as automated summaries and voices keep readers engaged
What is our primary use case?
My main use case for AssemblyAI is to summarize content. Our company asks writers to write complete applications, tell complete stories, or narrate stories on our platform. By using AssemblyAI , we create text-to-speech and textual summarization features. Writers accumulate their work into scripts or summaries, and we use those summaries to produce novel summaries.
A specific example of how I use AssemblyAI in my workflow is that story writers write complete stories, and AssemblyAI summarizes the entire story so that readers can access the summary written by the authors. Additionally, we have used it for text-to-speech, and we have utilized AssemblyAI in our workflow for both of these cases.
What is most valuable?
The best features AssemblyAI offers are summarization and animations. The AI summarization feature stands out for me because we work with Pocket FM, and we utilize it for summarization of our novelists and novel writers' stories. We have also utilized AssemblyAI for different voice generation options.
AssemblyAI has positively impacted my organization because by using it, both our story narrators and story readers benefit greatly. We are able to successfully generate better summaries of stories and story chapters, and the text-to-voice feature is very helpful for our users.
Specific outcomes that show how AssemblyAI has helped my organization include increased engagement and positive user feedback for text-to-speech. User engagement has increased from 76% to 78% by using AssemblyAI.
What needs improvement?
One area where AssemblyAI can be improved is in summarization. Sometimes it does not fetch the correct words or identify the most important things for that chapter, so it needs to improve in this area.
For how long have I used the solution?
I have been using AssemblyAI for two years.
What do I think about the stability of the solution?
AssemblyAI is stable in my experience.
What do I think about the scalability of the solution?
The scalability of AssemblyAI for my organization is good as we have a high volume of scale right now, with around 25,000 requests, and it is performing well.
How are customer service and support?
For customer support of AssemblyAI, I would rate it six to seven because sometimes they help us in a great way, but sometimes they do not help or take a long amount of time. AssemblyAI has a chatbot that helps a lot and assists us in accomplishing tasks, so I am satisfied with it.
Which solution did I use previously and why did I switch?
Before using AssemblyAI, I previously utilized ChatGPT for summarization of text and chapters written by authors. This process took a large amount of time, which led us to switch to AssemblyAI.
How was the initial setup?
On a scale of ten, I rate how easy it was to implement AssemblyAI in my environment as eight.
What about the implementation team?
I integrate AssemblyAI with my existing systems and workflows by using the Python library.
For updates or maintenance of AssemblyAI in my setup, the updates do not come frequently, so whenever they come, we update the Python package library.
What was our ROI?
I have seen a return on investment from AssemblyAI through time saving. Before using other tools for summarization of writers' stories, it took a lot of time, but with AssemblyAI, the time to convert a story into a summary has decreased significantly.
What's my experience with pricing, setup cost, and licensing?
Regarding my experience with pricing, setup cost, and licensing, I would like to know if it can be reduced somehow, but apart from that, licensing is good enough for us.
Which other solutions did I evaluate?
I did not evaluate other options before choosing AssemblyAI because I was referred to this platform by one of my seniors, so I utilized it directly and am happy with this software.
What other advice do I have?
My advice for others looking into using AssemblyAI is to check the packages in different languages while integrating it into their use cases, so I recommend checking those availability options. I would rate this review overall as an eight.
Research workflows have become smoother and manage multiple agents with accurate transcripts
What is our primary use case?
I used AssemblyAI for a lot of agents. I used AssemblyAI when I had to control multiple agents. With AssemblyAI, I was doing research while controlling or managing multiple agents. Regarding how I used AssemblyAI for research, I was conducting multi-agent research.
How has it helped my organization?
AssemblyAI has positively impacted my organization by making it easier to transcribe things and saving us a lot of time.
I do not know how much time AssemblyAI saved us, and I do not have a number for that, but it made things more efficient and easier.
What is most valuable?
In my experience, I generally appreciated the whole thing that AssemblyAI offers.
A particular feature that stood out to me about AssemblyAI was its great accuracy.
Regarding AssemblyAI's accuracy and reliability of output, it was really good, which is why we settled on it eventually.
I think AssemblyAI was really easy to use and intuitive for me.
What needs improvement?
I would not add anything else about the features. I do not have any suggestions for improvement. I would not add more about the needed improvements.
For how long have I used the solution?
I have been using AssemblyAI for about a year.
What do I think about the stability of the solution?
I believe AssemblyAI is stable.
Which solution did I use previously and why did I switch?
I did not previously use a different solution before AssemblyAI.
How was the initial setup?
My experience with AssemblyAI's pricing, setup cost, and licensing was that it was pretty easy.
What was our ROI?
I have seen a return on investment in terms of time saved, but I am not sure about money saved.
What's my experience with pricing, setup cost, and licensing?
My experience with AssemblyAI's pricing, setup cost, and licensing was that it was pretty easy.
Which other solutions did I evaluate?
I was not the one to evaluate other options before choosing AssemblyAI; there was someone else doing that, but we went through a list.
What other advice do I have?
I rate AssemblyAI a 10 on a scale of 1 to 10. I gave AssemblyAI a 10 because it was easy to use, made my life easier, made me efficient, and was successful in the company.
Regarding AssemblyAI's governance and security, I think it is pretty good, and I do not have much to comment on that.
I think AssemblyAI is really good, and we got a lot of use out of it, so I would definitely recommend it for researchers. My overall review rating for AssemblyAI is 10.