AssemblyAI Pricing: Transcription & AI Models (2026)

Pricing overview

AssemblyAI provides an API for converting speech to text and extracting insights from audio data, utilizing a usage-based pricing structure. The core offering, standard asynchronous transcription, is billed per second of processed audio. Additional features, such as real-time transcription and various Audio Intelligence models, are priced independently per second of usage. This modular approach allows users to only pay for the specific services consumed (AssemblyAI Pricing Page). The platform begins with a free tier, providing a monthly allowance of transcription, before transitioning to paid usage.

The pricing model is designed to scale with usage, making it suitable for both small-scale projects and enterprise-level applications requiring extensive audio processing. Unlike some providers, AssemblyAI details separate costs for different types of transcription (e.g., standard vs. real-time) and each distinct Audio Intelligence feature, such as summarization or topic detection. This granularity enables a more precise cost estimation based on specific application requirements.

Key factors influencing the total cost include the total duration of audio processed, whether transcription is real-time or asynchronous, and which Audio Intelligence features are applied to the audio. Data transfer costs typically apply to cloud services (Google Cloud Provider Comparison), but AssemblyAI's pricing focuses on processing time.

Plans and tiers

AssemblyAI primarily offers a single pay-as-you-go plan, with pricing tiers applying to different service types rather than distinct subscription levels. There are no fixed monthly subscription plans beyond the initial free tier; all usage is metered per second. Volume discounts are available for customers with high usage, typically engaging in custom enterprise agreements (AssemblyAI Enterprise Pricing).

The core components and their associated pricing structures are:

• Standard Asynchronous Transcription: This is the base service for converting pre-recorded audio files into text. It's priced at a fixed rate per second of audio processed.
• Real-time Transcription: Designed for live audio streams, this service has a different per-second rate due to the immediate processing requirements.
• Audio Intelligence Features: Each distinct Audio Intelligence model (e.g., summarization, sentiment analysis, speaker diarization, topic detection, content moderation) is priced individually, typically on a per-second basis applied to the audio processed by that specific feature.

This structure means a single audio file processed with multiple Audio Intelligence features will incur charges for the base transcription plus each applied feature. For example, transcribing a call and then applying sentiment analysis and summarization will result in charges for transcription, sentiment analysis, and summarization, all calculated based on the audio duration.

Here is a summary of the pricing components:

Note: All prices are illustrative and based on publicly available information as of 2026-05-29. For the most current pricing, refer to the official AssemblyAI pricing page.

Free tier and limits

AssemblyAI offers a free tier that includes 3 hours of standard asynchronous audio transcription per month (AssemblyAI Free Tier Details). This free usage resets monthly, allowing developers to test the API, build prototypes, and manage small-scale transcription needs without incurring costs. The free tier specifically applies to standard asynchronous transcription and does not cover real-time transcription or Audio Intelligence features, which are billed from the first second of usage.

The free tier is beneficial for:

• Experimentation: Developers can integrate the API and experiment with its capabilities without an initial investment.
• Prototyping: Building and testing applications that require speech-to-text functionality.
• Low-volume personal use: Users with minimal monthly transcription needs can utilize the service for free.

Once the 3 hours of free standard transcription are consumed within a calendar month, subsequent usage for standard transcription, and all usage for real-time transcription and Audio Intelligence features, will be billed at their respective per-second rates. Monitoring usage through the AssemblyAI dashboard is advisable to track consumption against the free tier limits.

Real-world cost examples

To illustrate AssemblyAI's pricing, consider the following scenarios:

Scenario 1: Transcribing a podcast episode

• Task: Transcribe a 60-minute (3600 seconds) podcast episode using standard asynchronous transcription.
• Calculation:
• Free tier usage: 3600 seconds (1 hour) will consume part of the monthly 3-hour free allowance.
• If this is the first hour used in the month, the cost is $0.00.
• If 2 hours have already been used, 1 hour (3600 seconds) will be billed at $0.0007/second.
• Cost: 3600 seconds * $0.0007/second = $2.52.

Scenario 2: Analyzing customer support calls

• Task: Transcribe ten 5-minute (300 seconds each) customer support calls, apply speaker diarization, and analyze sentiment. Total audio: 50 minutes (3000 seconds).
• Calculation:
• Standard Transcription: 3000 seconds * $0.0007/second = $2.10
• Speaker Diarization: 3000 seconds * $0.0002/second = $0.60
• Sentiment Analysis: 3000 seconds * $0.0001/second = $0.30
• Total cost (assuming free tier already consumed): $2.10 + $0.60 + $0.30 = $3.00

Scenario 3: Live captioning for a webinar

• Task: Provide real-time transcription for a 90-minute (5400 seconds) live webinar.
• Calculation:
• Real-time Transcription: 5400 seconds * $0.0045/second = $24.30
• Cost: $24.30 (Real-time transcription is not covered by the free tier).

Scenario 4: Processing a large audio archive

• Task: Transcribe 100 hours (360,000 seconds) of historical audio data, apply topic detection and summarization.
• Calculation:
• Standard Transcription: (360,000 - 10,800 seconds free tier) * $0.0007/second = 349,200 * $0.0007 = $244.44
• Topic Detection: 360,000 seconds * $0.0001/second = $36.00
• Summarization: 360,000 seconds * $0.0005/second = $180.00
• Total cost (after free tier): $244.44 + $36.00 + $180.00 = $460.44

How the pricing compares

AssemblyAI's pricing model is comparable to other leading speech-to-text API providers in the market, such as Deepgram, AWS Transcribe, and Google Cloud Speech-to-Text. While the base per-second rates can vary, the overall approach of usage-based billing and tiered pricing for different features is common across the industry.

• Deepgram: Offers a similar pay-as-you-go model with a free tier. Deepgram's pricing can be competitive, especially for advanced features and high volumes, with specific rates for different models (e.g., base, enhanced, on-premise) (Deepgram Pricing).
• AWS Transcribe: Amazon Web Services provides a comprehensive suite of AI/ML services, including AWS Transcribe. Its pricing is also usage-based, typically with lower rates for standard transcription and potentially higher rates for specialized features or higher data transfer out of AWS regions (AWS Transcribe Pricing). AWS often provides a generous free tier for new users across its services, including 60 minutes/month for Transcribe for the first 12 months.
• Google Cloud Speech-to-Text: Google Cloud's offering also follows a pay-as-you-go model, differentiating between short and long audio, and offering premium models for enhanced accuracy. It includes a free tier of 60 minutes per month (Google Cloud Speech-to-Text Pricing). Google Cloud's pricing can vary based on the model chosen (e.g., standard, enhanced, video).

When comparing, potential users should consider not just the raw per-second cost, but also:

• Accuracy: Differences in transcription accuracy for specific audio types (e.g., noisy environments, multiple speakers, specific accents) can impact the overall value. Higher accuracy might justify a slightly higher per-second rate if it reduces post-processing effort.
• Feature Set: The breadth and depth of Audio Intelligence features can vary. AssemblyAI's dedicated pricing for each feature allows for granular cost control, while some alternatives might bundle features or have different pricing for their equivalents.
• Developer Experience: Ease of integration, quality of documentation, and SDK support can influence development time and costs.
• Compliance: For highly regulated industries, certifications like HIPAA or SOC 2 Type II are critical considerations, where AssemblyAI offers strong compliance (AssemblyAI Security and Compliance).
• Volume Discounts: For large-scale deployments, custom enterprise pricing and volume discounts offered by each provider become a significant factor.

Ultimately, the most cost-effective solution depends on the specific use case, required features, and anticipated audio volume. Benchmarking with the free tiers of multiple providers is often recommended to determine the best fit for an application's unique requirements.