
Assemblyai
AssemblyAI offers an advanced audio transcription service that uses deep learning to deliver accurate speech-to-text API results for developers.
Pricing Change History
18 changesNew FAQ entry added asking what's included in the Voice Agent API's flat $4.50/hr rate. The question is newly visible in OCR; the detailed 'included features' answer text is markdown-only and not painted on screen.
Pre-recorded model 'Universal-3 Pro' renamed to 'Universal-3.5 Pro'; description now highlights 18-language support, native code switching, and improved speaker diarization. Price unchanged at $0.21/hr.
New realtime STT model announced: a site-wide banner on the pricing page now reads "NEW - Universal-3.5 Pro Realtime is here." with a Learn more link; no such banner appeared in the prior version.
Free plan pre-recorded audio limit increased from 185h to 333h; separate pre-recorded and streaming limits consolidated into one unified 333h allowance for pre-recorded or streaming audio.
Medical Mode add-on introduced for speech-to-text models; optimizes transcription for medical terminology in healthcare conversations.
Introduced Whisper-Streaming model at $0.30/hr as open-source Whisper enhanced with AssemblyAI infrastructure supporting 99+ languages Introduced Universal-3 Pro Streaming model at $0.45/hr for voice agents with best-in-class accuracy and advanced prompting capabilities
Pay as you go plan now highlights 'Speech Understanding and LLM Gateway' instead of 'Audio Intelligence and LeMUR', reflecting updated product naming.
Added Gemini 2.5 Flash Lite model to LLM Gateway at $0.10/1M input tokens, $0.40/1M output tokens
Free tier pre-recorded audio hours decreased from 416 hours to 185 hours Pre-recorded Speech-to-Text restructured from Best/Nano tiers to Slam-1/Universal models, both now priced at $0.27/hr (Best decreased from $0.37, Nano increased from $0.12)
Self-hosted deployments (On-prem, VPC) announced as coming soon for Custom plan Custom plan rate limits changed from 'Higher rate limits' to 'Customize rate limits - scale to any workload'
Claude Instant LLM model removed (was sunsetting on 10/28/24) Dual Channel feature renamed to Multichannel
Audio Intelligence models (Entity Detection, Topic Detection, Key Phrases, PII Redaction, Sentiment Analysis, Content Moderation, Auto Chapters, Summarization) now available for Free in the Free tier Added concurrency starting at 200 files for Pay-as-you-go plan
Entity Detection decreased from $0.15/hour to $0.08/hour (47% decrease) Sentiment Analysis decreased from $0.12/hour to $0.02/hour (83% decrease)
Research Assemblyai's pricing with the Pulse Agent
Ask anything about Assemblyai's plans, packaging shifts, and how it compares across the market — answered live from verified data.
Ask the agentCurrent plans
Captured| Plan | Type | Price |
|---|---|---|
| Free | Plan | Free |
| Voice Agent API | Plan | $4.5 per hour + $4.5 per hour |
| Universal-3 Pro | Plan | $0.21 per hour of audio |
| Universal-Streaming Multilingual | Plan | $0.15 per hour of audio |
| Universal-3 Pro Streaming | Plan | $0.45 per hour of audio |
| Custom | Plan | Contact |
| Universal-2 | Plan | $0.15 per hour of audio |
| Universal-Streaming | Plan | $0.15 per hour of audio |
| Guardrails | Add-on | $0.01 per hour (Profanity Filtering) |
| Speech Understanding | Add-on | $0.02 per hour (Speaker Identification) |
| LLM Gateway | Add-on | $0.05 per 1M input tokens (varies by model) |
Company Facts
How Assemblyai compares with its peers
| Company | Entry price | Last change |
|---|---|---|
R Rev.io![]() | — | — |
O Otter![]() | $8.33 /user/mo, billed annually | Jul 13, 2026 |
M Microsoft Azure![]() | Free | — |
I IBM![]() | $4.24 /client device/mo | Jul 3, 2026 |
D Deepgram![]() | $333.33 /mo, billed annually + usage | Sep 21, 2026 |
Assemblyai pricing FAQ
- How much does Assemblyai cost?
- Assemblyai prices on usage: the Voice Agent API plan is $4.5 per hour + $4.5 per hour, and the Free plan is free.
- Does Assemblyai have a free plan?
- Yes. Assemblyai's Free plan is free.
- What pricing model does Assemblyai use?
- Assemblyai uses usage-based pricing across 8 plans, with a free tier.
- When did Assemblyai last change its pricing?
- Aug 24, 2026: Assemblyai adds FAQ clarifying Voice Agent API's flat $4.50/hr rate.
- How often has Assemblyai changed its pricing?
- Pulse has recorded 18 pricing changes for Assemblyai since it started tracking on Nov 14, 2023; the pricing page was last captured on Aug 24, 2026.
- Who are Assemblyai's pricing peers?
- Pulse compares Assemblyai with Rev.io, Otter, Microsoft Azure, IBM and Deepgram.




