AssemblyAI
Speech AI API platform for pre-recorded and streaming transcription, voice agents, and an LLM gateway, fully self-serve with usage-based pricing.
Last verified:
AssemblyAI is a Speech AI API company, founded in 2017 (Y Combinator S17) and based in New York with a San Francisco office, providing pre-recorded transcription (Universal-3.5 Pro at $0.21/hour, Universal-2 at $0.15/hour), real-time streaming transcription (from $0.15/hour), a unified Voice Agent API ($0.075/minute all-inclusive), and an LLM Gateway billed per token across OpenAI, Anthropic, and Google models. It raised a $50M Series C in December 2023 (Accel-led, $115M total raised to date at announcement) and sells entirely self-serve: new accounts get $50 in free credit with no card required, and a HIPAA BAA can be signed in minutes without a sales call, though a custom Enterprise tier is also available via contact form.
Pricing
| Tier | Price | Key features |
|---|---|---|
| Pre-Recorded Transcription | Custom | Universal-3.5 Pro: $0.21/hour, Universal-2: $0.15/hour, Multichannel billed per channel |
| Streaming Transcription | Custom | Universal-3.5 Pro Realtime: $0.45/hour, Universal-Streaming (English/Multilingual): $0.15/hour, 5 streams/min on free tier, 100/min pay-as-you-go |
| Voice Agent API | Custom | Speech recognition, LLM reasoning, TTS, turn detection, interruption handling, tool calling bundled |
| Add-ons | Custom | Speaker diarization +$0.02-$0.12/hr, Medical mode +$0.15/hr, PII redaction +$0.05-$0.08/hr, Entity detection +$0.08/hr, Content moderation +$0.15/hr |
| Enterprise | Custom | Volume discounts, Multichannel discounted rates, Dedicated enterprise security review |
Source: https://www.assemblyai.com/pricing
Agent-readiness
- Discoverability
- 65/100
- Machine-readable content
- 70/100
- Programmatic access
- 85/100
- MCP / agent support
- 15/100
- Self-serve transactability
- 90/100
- Transparency
- 85/100
Security & compliance
- SSO / SAML
- Not publicly documented
- Encryption at rest
- Yes
- Encryption in transit
- Yes
- Audit log
- Not publicly documented
- Pentest report
- Not publicly documented
"Not publicly documented" means Crail found no public evidence either way — not a confirmed absence. See our methodology.
FAQ
Does AssemblyAI have a free tier?
Yes, AssemblyAI offers a free tier or free trial.
Can you buy AssemblyAI without talking to sales?
Yes, AssemblyAI can be purchased self-serve without a sales call.
Does AssemblyAI have an official MCP (Model Context Protocol) server?
Not as of 2026-07-27 — no official MCP server was found.
What compliance certifications does AssemblyAI hold?
AssemblyAI holds: SOC 2 Type 2, ISO 27001, HIPAA (BAA available), GDPR.
Reviews
No reviews yet for AssemblyAI. Be the first to submit a verified review.
Methodology & disclosure
Data verified via agent crawled, last checked 2026-07-27. Agent-readiness methodology version crail-ar-v0.1. No vendor payment influences these scores — see our methodology page.