Engineering and research · SpeechifyAI
The SpeechifyAI team builds the Simba text-to-speech models and the API that serves them. Posts under this byline are written and reviewed by the team, with every figure read from its source on the date shown.
Since 9 October 2026, SpeechifyAI takes an LLM's reply over a WebSocket as it is written. From Google Cloud us-east4 that day, the first word was audible 449 ms after the first token, against 468 ms with one HTTP request per sentence and 2,525 ms for the whole reply at once.
SpeechifyAI team
On 1 October 2026, SpeechifyAI's $10 Starter plan allowed 15 concurrent text-to-speech requests and its $99 Pro plan 30. Concurrency and rate limits for 14 text-to-speech APIs, plan by plan, read from each provider's own pages that day.
SpeechifyAI team
LiveKit's Python plugin adds Speechify TTS to an AgentSession in one line. It streams each sentence: 82 ms median first audio from US East on 28 Sep 2026.
SpeechifyAI team
Simba 3.2 reached first audio in a median of 106 ms on Coval over the 24 hours to 24 September 2026, and 123 ms on Voice Arena's US English board that day. What to measure before you pick a TTS API for a voice agent, and what cuts the wait.
SpeechifyAI team
Coval's independent benchmark measured Simba 3.2's median time to first audio at 379 ms on 13 September 2026 and 106 ms on 24 September, with the same model. What changed, why Coval counts leading silence, and how to reproduce it.
SpeechifyAI team
Monthly cost of 13 text-to-speech APIs at 1M, 10M and 100M characters, subscription fees included, read from each vendor's pricing page on 28 September 2026, next to each model's blind-listening score.
SpeechifyAI team
The 10 text to speech APIs worth evaluating in 2026, ranked on blind-listener scores from Artificial Analysis and priced per million characters.
SpeechifyAI teamFirst published by Luke Oliff
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