Assemblyai Introduces Free Tier with Audio Intelligence Models and 100 Hours of Speech-to-Text Transcription

Between the Apr 1, 2024 and Jul 1, 2024 captures of Assemblyai's pricing page, Pulse recorded 6 changes: 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 'Nano' tier for Speech-to-Text at $0.12/hour, providing a lower-cost option alongside the existing 'Best' tier at $0.37/hour; Added concurrency limit of 5 files for Free plan; Introduced Free plan tier allowing developers to transcribe up to 100 hours of audio with access to Speech-to-Text and Audio Intelligence models; Added concurrency starting at 200 files for Pay-as-you-go plan; Transitioned from simple pay-per-use pricing to tiered plan structure with Free, Pay-as-you-go, and Custom tiers. Pulse files it as a packaging change (feature added, new plan, threshold added, freemium change, package change) with an upward direction. Pulse's latest capture (Aug 24, 2026) lists Voice Agent API at $4.5 per hour + $4.5 per hour, Universal-3 Pro at $0.21 per hour of audio, Universal-Streaming Multilingual at $0.15 per hour of audio, Universal-3 Pro Streaming at $0.45 per hour of audio and Universal-2 at $0.15 per hour of audio.

Assemblyai's previous recorded change was "Assemblyai Announces Major Price Cuts: Sentiment Analysis and Key Phrases Drop by 83%, Auto Chapters by 73%, and More" (Q1 2024). Assemblyai has been tracked since 2023-11-14.

In the same window Deepgram also changed their AI & Machine Learning pricing pages. Those moves are listed further down, and the Pulse Agent can compare them side by side.