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On 2026-07-28 Fish Audio announced S2.1 Pro, a production voice model for live…

2026-07-28 · 18:19 UTC ·@dr_cintas ·1 min read

Brief

Fish Audio launched S2.1 Pro on 2026-07-28 as a low-latency, streaming voice model for live agents that clones voices from 5 seconds of audio, supports 83 languages, and provides word-level control of emotion and delivery. The company touts 2x+ throughput under load, claims performance/cost advantages versus Cartesia and Eleven Labs, raised $52M Seed, lists HeyGen/LiveKit/Retell/Sanas/OpenArt as production users, and is promoting cost-cutting guarantees and free-trial marketing offers.

Why it matters

On 2026-07-28 Fish Audio announced S2.1 Pro, a production voice model for live agents that supports streaming, low latency, 83 languages, and word-level control over emotion, pacing, intonation, and delivery; it can clone a voice from 5 seconds of audio.

Key details

  • Fish Audio claims S2.1 Pro delivers 2x+ throughput under high load, is “2x faster than Cartesia” and costs “1/6th the cost of Eleven Labs,” and the company raised a $52M Seed round.
  • Fish Audio says HeyGen, LiveKit, Retell, Sanas, and OpenArt run S2.1 Pro in production; they offer businesses a guarantee to cut voice-AI costs by 50% or provide 1 year free, plus a one-month free promo for their first birthday via social engagement.
Source evidence

🚨Fish Audio just launched S2.1 Pro

a production voice model for live agents: streaming, low latency, and it clones a voice on the fly.

  • voice cloning from 5 sec of audio
  • 2x+ throughput under high load
  • 83 languages
  • word level control over emotion, pacing and delivery

Video

Fish Audio (@FishAudio)

Today we’ve raised $52M Seed and we are announcing the public launch of S2.1 Pro.

>It can clone a voice from 5 seconds of audio
>2x faster than Cartesia & 1/6th the cost of Eleven Labs
>most expressive model with word level control over emotion, intonation, pacing etc

We support frontier AI companies including HeyGen, LiveKit, Retell, Sanas, and OpenArt all run our model in production.

If you're a business and we can't cut your voice AI costs by 50%, we'll give you 1 year of Fish Audio for free.
Book a demo: s.fish.audio/tmapke

To celebrate our first birthday, we'll give you 1 month of S2.1 Pro for free. Like, retweet, and comment “Fish” to get it.

Video

— https://nitter.net/FishAudio/status/2082152596739862853#m