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AssemblyAI

AssemblyAI · #4 most active of 15 in Audio

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Transcription plus summarisation, topic detection and speaker labels for developers.

83

Trust score · Mostly verified

3 data points checked · 2026-09-13

Model stack: VerifiedEntry price: DisputedVersion: VerifiedHow this works →

Current version

Universal-3.5 Pro

Entry cost

Free tier with $50 free credits, then pay-as-you-go starting at $0.15/hr for pre-recorded STT (Universal-2)

Changes / 30d

5

The short answers · verified September 16, 2026

What is the latest version of AssemblyAI?
The current shipped version of AssemblyAI is Universal-3.5 Pro, as of September 16, 2026.
How much does AssemblyAI cost?
AssemblyAI has no published flat entry price. Free tier with $50 free credits, then pay-as-you-go starting at $0.15/hr for pre-recorded STT (Universal-2)
What AI model does AssemblyAI use?
AssemblyAI runs primarily on Claude.

Source: AssemblyAI — assemblyai.com · Reusable under CC BY 4.0 — cite Tomorrow

Capabilities

  • Speaker diarization
  • Summarisation
  • Topic detection
  • PII redaction
  • LeMUR framework
  • Pre-recorded STT
  • Real-time STT
  • Voice Agent API
  • Speaker Diarization
  • Translation
  • Sentiment Analysis
  • Entity Detection
  • PII Redaction
  • LLM Gateway
  • Guardrails
  • Medical Mode
  • Keyterms Prompting
  • Voice Focus
  • Speech Understanding
  • Prompt Caching
  • Speech Understanding Add-Ons
  • Guardrails Add-Ons
  • Speaker Identification
  • PII Audio Redaction
  • Diarization
  • Prompting
  • Speech-to-Text
  • Real-time Transcription
  • Voice Agents
  • Content Moderation
  • Pre-recorded Speech-to-Text
  • Streaming Speech-to-Text
  • Synchronous Speech-to-Text
  • Streaming STT
  • Synchronous STT
  • Speech Understanding API
  • Guardrails API
  • LLM Gateway API
  • Custom Formatting

Pricing

  • Free Credits

    $50 in free credits, no credit card required

    Free

Entry price over time

7/28/2026 · $09/16/2026 · $0

Geek mode

Models under the hood

  • Claude

    Anthropic

    disclosed

  • Claude 4.6 Sonnet

    Anthropic

    disclosed

  • Claude 4.8 Opus

    Anthropic

    disclosed

  • Gemini 2.5 Pro

    Google

    disclosed

  • Gemini 3.5 Flash

    Google

    disclosed

  • GPT-5.5

    OpenAI

    disclosed

  • Qwen3 Next 80B A3B

    Alibaba

    disclosed

  • u3-rt-pro

    AssemblyAI

    disclosed

  • Universal-2

    AssemblyAI

    disclosed

  • universal-3-pro

    AssemblyAI

    disclosed

  • Universal-3.5 Pro

    AssemblyAI

    disclosed

  • Universal-3.5 Pro Realtime

    AssemblyAI

    disclosed

  • Universal-Streaming English

    AssemblyAI

    disclosed

  • Universal-Streaming Multilingual

    AssemblyAI

    disclosed

Context window

n/a

Public API

yes

Multi-model routing

yes

Stack signals

  • Python SDK
  • JavaScript SDK
  • LiveKit
  • Pipecat

Shared model stack

Other tracked products running on the same foundation models — a quick read on how much of the catalog moves when one of these models changes.

green disclosed · amber inferred · grey unattributed. Aliases are folded into one model; provider concentration counts only models with an established vendor.

Reported scale

Reference data. Each figure is whatever the source actually said — weekly users, downloads, revenue run-rate — with its own definition and date. These are not comparable between tools and are never used to rank anything.

No public usage figure on record for this product.

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Pricing not specified in the document
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Elsewhere on the same models

Products in other segments that name one of AssemblyAI's models in their stack.

Abridge

Abridge

6

Ambient clinical documentation

Version
Contextual Reasoning Engine
Cost
Pricing is not publicly available. Contact sales for enterprise pricing.
Model
GPT-5.5
Agentforce

Salesforce

1

Autonomous service and sales agents grounded in CRM data.

Version
Agentforce
Cost
from $2/mo
Model
Claude
AI/BI Genie

Databricks

4

Ask your lakehouse questions

Version
Genie
Cost
No additional license fees. Included with Databricks Lakehouse usage (standard DBU rates apply).
Model
Claude
Amazon Q Business

AWS

8

Enterprise assistant grounded in a company's AWS-connected content.

Version
Amazon Q Business
Cost
Free tier · from $3/mo
Model
Claude
Amazon Q Developer

AWSUnited States

8

AWS-native coding agent

Version
Amazon Q Developer
Cost
Free tier available with 50 agentic chat interactions per month. Paid pricing not fully detailed on this page.
Model
Claude
Atlassian Rovo

Atlassian

4

Search, chat and agents across Jira, Confluence and connected SaaS.

Version
Rovo
Cost
Included with paid Atlassian Cloud plans (Jira, Confluence, Jira Service Management) starting with Standard plans.
Model
Claude

Change history

  • pricing

    Entry price decreased to $0/mo

    $0.15$0

    source
  • pricing

    Entry price increased to $0.15/mo

    $0$0.15

    source
  • capability

    New capabilities: Streaming STT, Synchronous STT

    33 tracked35 tracked · +Streaming STT, Synchronous STT

    source
  • pricing

    Entry price decreased to $0/mo

    $0.15$0

    source
  • capability

    New capabilities: Pre-recorded Speech-to-Text, Streaming Speech-to-Text, Synchronous Speech-to-Text

    30 tracked33 tracked · +Pre-recorded Speech-to-Text, Streaming Speech-to-Text, Synchronous Speech-to-Text

    source
  • pricing

    Entry price increased to $0.15/mo

    $0$0.15

    source
  • pricing

    Entry price decreased to $0/mo

    $0.15$0

    source
  • pricing

    Entry price increased to $0.15/mo

    $0$0.15

    source
  • capability

    New capabilities: Content Moderation

    29 tracked30 tracked · +Content Moderation

    source
  • capability

    New capabilities: Voice Agents

    28 tracked29 tracked · +Voice Agents

    source
  • capability

    New capabilities: Real-time Transcription

    27 tracked28 tracked · +Real-time Transcription

    source
  • pricing

    Entry price decreased to $0/mo

    $0.15$0

    source
  • capability

    New capabilities: Speech-to-Text

    26 tracked27 tracked · +Speech-to-Text

    source
  • capability

    New capabilities: Diarization, Prompting

    24 tracked26 tracked · +Diarization, Prompting

    source
  • pricing

    Entry price increased to $0.15/mo

    $0$0.15

    source
  • capability

    New capabilities: Speaker Identification, PII Audio Redaction

    2210

    source
  • capability

    New capabilities: Speech Understanding Add-Ons, Guardrails Add-Ons

    206

    source
  • capability

    New capabilities: Speech Understanding, Prompt Caching

    189

    source
  • model

    AssemblyAI added Universal-3.5 Pro Realtime, Universal-Streaming English, Universal-Streaming Multilingual, Claude 4.8 Opus, Gemini 3.5 Flash, Qwen3 Next 80B A3B to its model stack

    Claude, Claude 4.6 Sonnet, GPT-5.5, Gemini 2.5 Pro, Universal-2, Universal-3.5 ProClaude, Claude 4.6 Sonnet, Claude 4.8 Opus, GPT-5.5, Gemini 2.5 Pro, Gemini 3.5 Flash, Qwen3 Next 80B A3B, Universal-2, Universal-3.5 Pro, Universal-3.5 Pro Realtime, Universal-Streaming English, Universal-Streaming Multilingual

    source
  • capability

    New capabilities: Medical Mode, Keyterms Prompting, Voice Focus

    1510

    source
  • version

    AssemblyAI moved to Universal-3.5 Pro

    Universal-2Universal-3.5 Pro

    source
  • model

    AssemblyAI added Universal-3.5 Pro, GPT-5.5, Claude 4.6 Sonnet, Gemini 2.5 Pro to its model stack

    Claude, Universal-2Claude, Claude 4.6 Sonnet, GPT-5.5, Gemini 2.5 Pro, Universal-2, Universal-3.5 Pro

    source
  • capability

    New capabilities: Pre-recorded STT, Real-time STT, Voice Agent API

    510

    source
  • version

    Universal-2 model rolled out as the default

    Universal-1Universal-2

    source
  • pricing

    Entry price decreased to $0.15/mo

    $4.5$0.15

    source
  • model

    AssemblyAI added u3-rt-pro, universal-3-pro to its model stack

    Claude, Claude 4.6 Sonnet, Claude 4.8 Opus, GPT-5.5, Gemini 2.5 Pro, Gemini 3.5 Flash, Qwen3 Next 80B A3B, Universal-2, Universal-3.5 Pro, Universal-3.5 Pro Realtime, Universal-Streaming English, Universal-Streaming MultilingualClaude, Claude 4.6 Sonnet, Claude 4.8 Opus, GPT-5.5, Gemini 2.5 Pro, Gemini 3.5 Flash, Qwen3 Next 80B A3B, Universal-2, Universal-3.5 Pro, Universal-3.5 Pro Realtime, Universal-Streaming English, Universal-Streaming Multilingual, u3-rt-pro, universal-3-pro

    source
  • pricing

    Entry price increased to $4.5/mo

    $0.15$4.5

    source
  • pricing

    Entry price increased to $0.15/mo

    $0$0.15

    source
  • capability

    New capabilities: Custom Formatting

    38 tracked39 tracked · +Custom Formatting

    source
  • pricing

    Entry price decreased to $0/mo

    $0.15$0

    source
  • capability

    New capabilities: Speech Understanding API, Guardrails API, LLM Gateway API

    35 tracked38 tracked · +Speech Understanding API, Guardrails API, LLM Gateway API

    source
Subscribe to AssemblyAI changes

AssemblyAI compared

Straight head-to-head pages against the busiest products in Audio.

AssemblyAI vs MurekaAssemblyAI vs DeepgramAssemblyAI vs SunoAssemblyAI vs ElevenLabsAssemblyAI vs WhisperAssemblyAI vs Cartesia

How to cite this page

Free to cite and reuse under CC BY 4.0. Permalink: https://tomorrow.aliensquad.ai/tools/assemblyai

APA
Tomorrow. (2026). AssemblyAI — version, pricing and model stack [Data set entry]. AlienSquad. Retrieved 2026-09-17, from https://tomorrow.aliensquad.ai/tools/assemblyai
BibTeX
@misc{tomorrow-tools-assemblyai,
  author       = {{Tomorrow}},
  title        = {AssemblyAI — version, pricing and model stack},
  year         = {2026},
  publisher    = {AlienSquad},
  howpublished = {\url{https://tomorrow.aliensquad.ai/tools/assemblyai}},
  note         = {Accessed: 2026-09-17}
}