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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Pricing
Pricing is based on actual usage, with charges varying according to how much you consume. Subscriptions have no end date and may be canceled any time.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
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 |
Dimensions summary
You pay only for what you use, with no upfront commitment. Pricing splits into core transcription models and optional add-ons that stack on top. Async models, streaming models, a single-call Sync API, and a Voice Agent API each carry their own base rate. Async work bills per audio hour; streaming bills per session duration; the Voice Agent API bills per minute. Speech understanding, guardrails, prompting, diarization, and Medical Mode are separate per-hour add-ons layered onto a base model. LLM Gateway bills per million input and output tokens, with the rate set by the chosen model.
Top-of-mind questions for buyers
Streaming bills on the WebSocket session duration, meaning the time the connection stays open, not the audio sent. Idle time between calls counts. Close connections immediately when a call ends to avoid charges for open, unused sessions.
Add-ons stack additively on the base model's per-hour rate. If you run a base model with Medical Mode and Speaker Diarization, each per-hour charge adds to the base rate for a combined hourly total on the same audio.
Multichannel audio bills per channel. A one-hour stereo file with two channels counts as two billable hours. Each channel is transcribed independently. Confirm channel count in advance, since more channels multiply your billed hours.
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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 .
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.
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Customer reviews
Jagadis P.
Accurate Multilingual Speech-to-Text That Boosts Customer Support and Analysis
Reviewed on Aug 14, 2026
Review provided by G2
What do you like best about the product?
Our company deals in more than 35+ countries and multiple languages, so it becomes very important for us for speech to text in language converted values and that helps our customer support to perform well. It also helps us to put speech into well structured data set which helps us in doing various analysis and improve our offerings.
What do you dislike about the product?
Its a good product but it comes with some drawbacks like vendor dependent setup, if any changes happens at their level, we also need to improve our setup and that creates a huge problem if it is not managed well. Cost also in terms of hours + LLM processing is huge, and with huge operations it is super expensive tool
What problems is the product solving and how is that benefiting you?
We are using this at almost all voice related support on all our sales channels and that is eliminating a lot of basic queries to be responded and with that 40% of responses are already automated and good customer feedback on same. We are able to also record the senitments of customer and their feedback and that helps us to forecast our demands as well.
aman g.
AssemblyAI Makes Speech and Audio Projects Easy and Time-Saving
Reviewed on Aug 14, 2026
Review provided by G2
What do you like best about the product?
I like that AssemblyAI is easy to use and works well for speech and audio. It saves time and makes things easier to build and manage.
What do you dislike about the product?
Sometimes the setup can be a little difficult, especially in the beginning. Also, some features could be more simple and easier to understand.
What problems is the product solving and how is that benefiting you?
AssemblyAI helps us handle speech and audio data without doing everything manually. It saves time, makes the work faster, and helps us build things more easily.
Viraj K.
Developer-Friendly Platform Focused on Real-World Applications
Reviewed on Aug 13, 2026
Review provided by G2
What do you like best about the product?
Developer friendly platform,focus on real world application
What do you dislike about the product?
I dislike about there complex onboarding
What problems is the product solving and how is that benefiting you?
It solve my speech automation problem and it helpful for me
Jessica S.
Robust Call Analytics Producing Accurate Text That Deepen Understanding of Customer Needs
Reviewed on Aug 13, 2026
Review provided by G2
What do you like best about the product?
I really like the robust insights and call analytics that this tool provides which leads to greater understanding of the customer needs and helps improve the behavior of employees when responding to customers.
What do you dislike about the product?
No major problems encountered in the use of this tool and it does not include any complicated functions or tools.
What problems is the product solving and how is that benefiting you?
The accurate call summaries have helped us easily understand customer needs and trends and the text generated from calls helps write emails when answering customer inquiries.
Computer Software
Effortless Multi-Language Captions with Precise Timestamps and Speaker Diarization
Reviewed on Aug 12, 2026
Review provided by G2
What do you like best about the product?
AssemblyAI's precise word level timestamping and speaker diarization make generating multi-language captions and searchable transcripts for our OTT video catalog effortless. Its high-accuracy models handle noisy background audio in stream tracks seamlessly, drastically reducing manual subtitle post-editing time.
What do you dislike about the product?
Real-time streaming transcription currently supports fewer concurrent languages compared to async processing, which can limit live multi-region OTT broadcasts. Additionally, stacking multiple audio intelligence add-ons like entity detection and topic modeling can cause costs to scale quickly on high-volume catalog runs.
What problems is the product solving and how is that benefiting you?
Assembly AI solves the massive friction and cost of manually captioning and indexing large video catalogs. It benefits our OTT platform by automatically generating frame-accurate captions, enabling full-text searchability aross stream archives, and speeding up global content distribution.