AssemblyAI-TTS-1
AssemblyAI's first text-to-speech model aimed at voice agent scenarios. Billing is per character, concurrency is unlimited, and it supports six languages at launch.
Core Facts
Timeline (last 90 days)
For teams building voice agents, AssemblyAI-TTS-1 is worth adding to the shortlist for a hands-on test, especially in scenarios that are sensitive to first-packet latency and have highly fluctuating usage.
AssemblyAI-TTS-1's streaming response first-packet latency is as low as 90 milliseconds.
AssemblyAI-TTS-1 uses per-character billing at $15 per 1 million characters and does not require an annual contract.
AssemblyAI-TTS-1 claims to offer unlimited concurrency, meaning the server does not limit the number of simultaneous synthesis requests, and integrators need not pay extra for capacity planning or apply for quotas.
90 milliseconds is the streaming first-packet metric (Time to First Byte), not the generation time for an entire speech segment.
On Product Hunt, AssemblyAI-TTS-1 received 70 votes and 2 comments, ranking 20th.
AssemblyAI-TTS-1 can be used without signing a contract and with unlimited concurrency.
AssemblyAI-TTS-1 supports 6 languages at launch.
The source material does not disclose which 6 languages AssemblyAI-TTS-1 specifically supports, nor does it explain plans for later expansion.
Metrics such as audio quality, first-packet latency, long-text stability, voice cloning and emotion control are not covered in the available material.
2 more timeline events
All Facts (12)
AssemblyAI is a company focused on voice AI infrastructure, developing its own speech-to-text foundation models and expanding into a full voice agent technology stack.
65%UnverifiedFor teams building voice agents, AssemblyAI-TTS-1 is worth adding to the shortlist for a hands-on test, especially in scenarios that are sensitive to first-packet latency and have highly fluctuating usage.
50%UnverifiedAssemblyAI-TTS-1's streaming response first-packet latency is as low as 90 milliseconds.
50%UnverifiedAssemblyAI-TTS-1 uses per-character billing at $15 per 1 million characters and does not require an annual contract.
50%UnverifiedAssemblyAI-TTS-1 claims to offer unlimited concurrency, meaning the server does not limit the number of simultaneous synthesis requests, and integrators need not pay extra for capacity planning or apply for quotas.
50%Unverified90 milliseconds is the streaming first-packet metric (Time to First Byte), not the generation time for an entire speech segment.
50%UnverifiedOn Product Hunt, AssemblyAI-TTS-1 received 70 votes and 2 comments, ranking 20th.
50%UnverifiedAssemblyAI-TTS-1 supports 6 languages at launch.
50%UnverifiedThe source material does not disclose which 6 languages AssemblyAI-TTS-1 specifically supports, nor does it explain plans for later expansion.
50%UnverifiedMetrics such as audio quality, first-packet latency, long-text stability, voice cloning and emotion control are not covered in the available material.
50%UnverifiedAssemblyAI-TTS-1 is suitable for integration as a primary or backup TTS channel for voice agents, especially as elastic capacity during traffic peaks.
50%UnverifiedAssemblyAI-TTS-1 can be used without signing a contract and with unlimited concurrency.
50%