What is AssemblyAI?

AssemblyAI AssemblyAI delivers real‑time and batch speech‑to‑text transcription with high accuracy and low latency, supporting more than 99 languages and code‑switching scenarios. The platform includes advanced speech‑understanding features such as speaker diarization, sentiment analysis, chapter detection, and automatic language identification.

Custom prompts enable granular control of disfluencies, fillers, and speaker roles for conversational analysis. Medical Mode provides terminology‑specific accuracy for clinical transcripts, while PII redaction tools remove personal identifiers automatically.

Developers can integrate the API via simple REST calls or SDKs, scale to millions of inference requests, and deploy on cloud or self‑hosted environments for compliance. AssemblyAI’s models excel in word‑error‑rate reduction and hallucination suppression, making them suitable for call centers, voice assistants, and content summarization workflows.

AssemblyAI pricing Freemium

Key phrases $0.01

Profanity filtering $0.01

Sentiment analysis $0.02

Custom formatting $0.03

Summarization $0.03

Keyterms prompting add-on $0.04

Pii audio redaction $0.05

Gpt-5 nano $0.05

Translation $0.06

Gpt-oss-20b $0.07

Entity detection $0.08

Auto chapters $0.08

Pii redaction $0.08

Gemini 2.5 flash lite $0.10

Speaker diarization add-on $0.12

Start building as low as $0.15/hr $0.15

Universal-2 $0.15

Universal-streaming $0.15

Universal-streaming multilingual $0.15

Topic detection $0.15

Content moderation $0.15

Gpt-oss-120b $0.15

Qwen3 next 80b a3b $0.15

Qwen3 32b $0.15

Universal-3 pro $0.21

Gpt-5-mini $0.25

Claude 3 haiku $0.25

Whisper-streaming $0.30

Gemini 2.5 flash $0.30

Gemini 3 flash $0.50

Kimi k2.5 $0.60

Claude 3.5 haiku $0.80

Claude 4.5 haiku $1.00

Gpt-5.1 $1.25

Gpt-5 $1.25

Gemini 2.5 pro $1.25

Gpt-5.2 $1.75

Gpt 4.1 $2.00

Gemini 3 pro $2.00

Claude 4.6 sonnet $3.00

Claude 4.5 sonnet $3.00

Claude 4 sonnet $3.00

Chatgpt-4o $5.00

Claude 4.6 opus $5.00

Claude 4.5 opus $5.00

Claude 4 opus $15.00

Pay as you go varies

Speech understanding varies

Verify on the official pricing page.

View plans

AssemblyAI user reviews

Based on 9 reviews, 44.4% of users recommend AssemblyAI, rated highly for ease of use.

recommend

don't

9 reviews

Liked for

Worth the price 4 of 4

Easy to use 4 of 4

Good integrations 4 of 4

Quality results 2 of 4

All key features 1 of 4

Disliked for

Missing features 3 of 5

Inconsistent results 2 of 5

Not worth the price 1 of 5

Hard to use 1 of 5

Lacks integrations 1 of 5

Would you recommend AssemblyAI?

Recommend this tool?

AssemblyAI's key features

Real-time streaming transcription
1500-word contextual prompting
Speaker diarization and labeling
Automatic language detection code-switching
Auto punctuation and casing
Multilingual support 99+ languages
LLM gateway integration

AssemblyAI use cases

Stream real‑time customer support calls into AssemblyAI, automatically transcribing and sentiment‑analyzing the conversation, then highlighting key issues and providing speaker diarization for accurate agent performance reviews.
Convert entire hours of medical dictations into structured text with AssemblyAI’s medical terminology model, simultaneously redacting all PII and extracting key clinical entities for seamless EHR integration.
Transcribe multilingual podcast episodes in batch, using AssemblyAI’s language detection and speaker diarization to generate separate subtitle files per speaker and per language, then publish them with accurate captions and SEO metadata.