Access powerful AI models to transcribe and understand speech via a simple API. Try our no-code playground for free 👉 https://xitter.gq/t.co/YPCK9mqDG6
Joined October 2017
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AssemblyAI retweeted
Hosted my first every Hardware hackathon at @AssemblyAI
can't wait to see you all for the next one, sign up below!
We built Blurt for Google Forms. Now you can just dictate your answers and have your Google Form filled in automatically.
Blurt is free and open source: assemblyai.com/blurt?utm_med…
AssemblyAI retweeted
@AssemblyAI Universal 3.6 Pro has the lowest WER on clean audio: 1.77%. Their final transcript lands 91ms after the caller stops
AssemblyAI retweeted
Have you shipped speech-to-speech to production?
2027 Voice Agent Architecture Survey, first 200 get $25: forms.gle/uC4qs9PwnHPX3Y1s9
What's the best way to show off a new text-to-speech model? Give it a personality, then make it a little haunted.
Last week in SF: Therapista, Jack the Roaster, the Crypt Keeper, and a surprise voice cloning station. 👻
Thanks to everyone who came out in costume!
AssemblyAI retweeted
Have you tried AssemblyAI-tts-1 on LiveKit Inference yet?
@AssemblyAI built its first TTS model for voice agents and trained it on real phone conversations. It gets to first audio in about 90ms, offers 4,000+ voices, supports 6 languages, and includes word timestamps, all for $15 per 1M characters.
It’s one more choice in the lineup, so give it a try and see how it sounds with your agent > docs.livekit.io/agents/model…
What makes text-to-speech sound natural? We hopped on a huddle with Pasquale D'Alterio, lead researcher on AssemblyAI-TTS-1, to find out.
assemblyai.com/blog/text-to-…
Free ice cream in SoMa 🎃🍦
Yesterday we launched TTS-1, our Text-to-Speech model built for voice agents. To celebrate, the AssemblyAI ice cream truck is back with customer flavors on the menu:
🍦 Granilla ft. @meetgranola
🍪 Cookies & Commure ft. @CommureOS
🥜 Retell in a Nutshell ft. @retellai
🫐 Triple-Berry Triplex ft. EliseAI
🎃 Trick or Tolan ft. Tolan
🍫 Area Cocoa ft. @telnyx
Bring your friends for a pre-Halloween sugar high and come meet the team.
📍 Outside Moscone Center
🕛 Today, 12–5 PM PT
AssemblyAI retweeted
AssemblyAI CEO @YouveGotFox reveals how just 10 seconds of audio is enough to clone someone's voice with AI:
"We have over 4,000 voices available on our API, and we also support instant voice cloning. With as little as 10 seconds of someone’s voice, you can instantly clone it. Obviously, if you have the consent to do that."
"The voice for your AI, in a lot of ways, that is the user experience. I might want my voice to sound funny and sarcastic because that fits my brand."
"If you’re calling into a business, you want it to sound local. If you’re in a town in the UK, you want it to have the same regional accent as where you’re living."
@AssemblyAI
We are live on OpenRouter as well!!
AssemblyAI-TTS-1 is now live on OpenRouter!
@AssemblyAI's first text-to-speech model, built for voice agents. Ranked in the best quadrant for speed and accuracy, and highest naturalness for models at $15/1M characters or less, per @cekuraAi's benchmark.
4,000+ voices, served from US or EU.
AssemblyAI retweeted
Hopping on @MTSlive with with @sophiadew at 1:30PM PT to talk about @AssemblyAI's TTS-1 model we shipped today!
UK ROGUE AGENT RESPONSE | QWEN NEURONS | TOUCHSCREEN MACBOOK xitter.gq/i/broadcasts/1dxYlaZzE…
Tips our team found for accurate voice clones:
- WAV, not MP3
- 15 to 25 seconds of reference audio
- Scripted or unscripted: try both
- Pick the mic that fits your use case
Voice cloning docs: assemblyai.com/docs/tts/clon…
Artificial Analysis evaluated AssemblyAI-TTS-1 in its arenas:
• 162 characters/sec, faster than Sonic 3.6
• Top 10 in Controlled Voice, same 8 cloned voices across models
• Top 12 in Provider Voice
• Of the 11 models ranked above it, 9 cost more than $15/1M characters
Thanks @ArtificialAnlys
AssemblyAI has launched its first Text to Speech model! AssemblyAI-TTS-1 enters the top 12 in our Provider Voice Arena and the top 10 in Controlled Voice
@AssemblyAI has launched its first Text to Speech model, AssemblyAI-TTS-1! We evaluated its performance across both Speech Arenas and our Pronunciation Robustness benchmark.
Key takeaways:
➤ Text to Speech, Provider Voice: AssemblyAI-TTS-1 scores an Elo of 1,227 across 1,626 arena appearances, ranking #12, just behind Breeze TTS 2 at 1,228 and ahead of Mistral's Voxtral 3 TTS at 1,221 and Inworld's Realtime TTS-2 Flash at 1,218. It ranks #12 in both English (US) and English (UK).
➤ Text to Speech, Controlled Voice: AssemblyAI-TTS-1 scores 1,110 across 1,674 appearances, ranking #10 with the same 8 cloned voices, behind Cartesia's Sonic 3.5 at 1,118 and ahead of Speechify's Simba 3.2 at 1,086. It ranks #6 in Knowledge Sharing.
➤ Pronunciation Robustness: AssemblyAI-TTS-1 scores 81.7% across 2,115 rated clips, ranking #16, behind HeyGen Voice at 83.2% and ahead of Inworld Realtime TTS-2 at 80.7%. It ranks #6 in Preserving Exact Sequences at 81.5%.
➤ Speed: AssemblyAI-TTS-1 generates 162 characters per second, faster than Cartesia's Sonic 3.6 at 148.6 and Mistral's Voxtral 3 TTS at 112.3.
➤ Pricing: AssemblyAI-TTS-1 is priced at $15/1M characters. Of the eleven models ranked above it on Provider Voice, only two cost less: Gemini 3.8 Flash-Lite TTS at $11/1M and Simba 3.2 at $6.6/1M. Eleven v4 is $80/1M and Sonic 3.6 $49/1M.
See more details and listen to samples below ⬇️
AssemblyAI retweeted
AssemblyAI has launched its first Text to Speech model! AssemblyAI-TTS-1 enters the top 12 in our Provider Voice Arena and the top 10 in Controlled Voice
@AssemblyAI has launched its first Text to Speech model, AssemblyAI-TTS-1! We evaluated its performance across both Speech Arenas and our Pronunciation Robustness benchmark.
Key takeaways:
➤ Text to Speech, Provider Voice: AssemblyAI-TTS-1 scores an Elo of 1,227 across 1,626 arena appearances, ranking #12, just behind Breeze TTS 2 at 1,228 and ahead of Mistral's Voxtral 3 TTS at 1,221 and Inworld's Realtime TTS-2 Flash at 1,218. It ranks #12 in both English (US) and English (UK).
➤ Text to Speech, Controlled Voice: AssemblyAI-TTS-1 scores 1,110 across 1,674 appearances, ranking #10 with the same 8 cloned voices, behind Cartesia's Sonic 3.5 at 1,118 and ahead of Speechify's Simba 3.2 at 1,086. It ranks #6 in Knowledge Sharing.
➤ Pronunciation Robustness: AssemblyAI-TTS-1 scores 81.7% across 2,115 rated clips, ranking #16, behind HeyGen Voice at 83.2% and ahead of Inworld Realtime TTS-2 at 80.7%. It ranks #6 in Preserving Exact Sequences at 81.5%.
➤ Speed: AssemblyAI-TTS-1 generates 162 characters per second, faster than Cartesia's Sonic 3.6 at 148.6 and Mistral's Voxtral 3 TTS at 112.3.
➤ Pricing: AssemblyAI-TTS-1 is priced at $15/1M characters. Of the eleven models ranked above it on Provider Voice, only two cost less: Gemini 3.8 Flash-Lite TTS at $11/1M and Simba 3.2 at $6.6/1M. Eleven v4 is $80/1M and Sonic 3.6 $49/1M.
See more details and listen to samples below ⬇️
Independent results from Cekura's text-to-speech benchmark, 27 models tested:
• #1 on phone numbers and codes (91.7%)
• Best quadrant for speed and accuracy
• 4.50 naturalness, highest of any model at $15/1M characters or less
• Every medical term read correctly
AssemblyAI-TTS-1. Thanks @cekuraAi for running it.
What would you do if you could clone yourself?
Watch to the end. Then try AssemblyAI text-to-speech, live today:
assemblyai.com/products/text…
🤖 Made with AI
Introducing AssemblyAI-TTS-1, our first text-to-speech model.
Natural speech for voice agents, streaming in 90 ms, at $15 per million characters. On accuracy, naturalness, and cost together, it’s the best TTS model you can run at scale.
Live today:
- Leading accuracy on independent benchmarks
- 90 ms time to first audio
- Trained on millions of hours of audio
- Instant voice cloning
- 4,000+ voices, with new ones added daily
Every voice, language, and region included at $15 per 1M characters
Available today. Watch a kid use it to order a pizza.
