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Favicon for fish-audio

Fish Audio: S2.1 Pro Free (free)

fish-audio/s2.1-pro-free:free

BenchmarksCompare

S2.1 Pro Free is the no-cost variant of Fish Audio S2.1 Pro, intended for testing, prototyping, and low-volume applications. It provides the same synthesis capabilities without production latency or availability guarantees.

Modalities
Price
Free
Released
Jul 29, 2026
BenchmarksCompare
PlaygroundProvidersPerformanceUptimeAppsActivityFAQExplore

Example outputs summary for Fish Audio: S2.1 Pro Free (free)

  • Text to Speech: The warm light flows across the OpenRouter office as the evening settles in and the routing never stops. One interface, hundreds of models. Ready when you are. — spoken by Fish Audio: S2.1 Pro Free (free)

Playground

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

Explore more models

Free AI Models on OpenRouterCollectionBest Text-to-Speech ModelsCollectionSpeech Model RankingsRanking
Latency
FreeFree0.72s
99.48%
ProviderInput / Output /M
LatencyUptime
  • Favicon for Fish Audio
    Input Free / Output Free
    Latency 0.72sUptime 99.48%
Latency
0.71s

P50, best provider

Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.64%

Availability over the last 3 days

Last 72 hours
Availability 99.64%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.81%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

1.
Favicon for https://lumiverse.chat/
Lumiverse
new
1.45Mtokens
2.
Favicon for https://medicine.kazimiri.com/
medicine.kazimiri.com blanking read-back
new
1.11Mtokens
3.
Favicon for https://sapport.io/
Formula AI
new
809Ktokens
4.
Favicon for https://www.stackupnews.com/
news-template
new
601Ktokens
5.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
535Ktokens
Rest of OpenRouter
997K
Top 5 Apps
104K

Frequently asked questions

S2.1 Pro Free is the no-cost variant of Fish Audio S2.1 Pro, intended for testing, prototyping, and low-volume applications. It provides the same synthesis capabilities without production latency or availability guarantees.

Yes. The pricing shown on this page for S2.1 Pro Free (free) is zero, so you are not charged for generated speech. Free endpoints are rate limited — see the rate limit docs.

S2.1 Pro Free (free) accepts text as input and returns generated speech audio.

Drama 3, S1, S2 Pro and 1 more are other speech models from Fish Audio.

S2.1 Pro Free (free) was released on July 29, 2026.

More models from fish-audio

Drama 3

Drama 3 is a text-to-speech model from Fish Audio built for directed voice performances. You write the direction in plain language in square brackets before a line, such as [nervous, barely holding it together], and can add sounds and pauses inline or change the delivery of specific words with paired tags like <whisper>.

It supports multi-speaker scenes in one request, switching language mid-sentence across 80+ languages in the same voice, and phoneme tags for pinning pronunciation of names and terms.

Speech$2/M UTF-8 bytes
Transcribe 1 Pro

Transcribe 1 Pro is a speech-to-text model from Fish Audio tuned for interviews, meetings, and podcasts. It labels speakers with inline speaker markers, preserves emotion and vocal-event cues such as [laughter], detects language automatically, and can return timestamped word-level segments.

Transcription$0.0001/second
Transcribe 1

Transcribe 1 is a speech-to-text model from Fish Audio. It is suited for audio transcription with automatic language detection and can return timestamped word-level segments when alignment details are requested.

Transcription$0.0001/second
S1

S1 is a multilingual text-to-speech model from Fish Audio. It is suited for voice applications that need broad emotional expression, using parenthetical controls to guide speaking style across its supported languages.

Speech$15/M UTF-8 bytes
S2 Pro

S2 Pro is a multilingual text-to-speech model from Fish Audio. It is suited for expressive narration and multi-speaker dialogue, with natural-language controls for speaking style and emotion.

Speech$15/M UTF-8 bytes
S2.1 Pro Free (free)

S2.1 Pro Free is the no-cost variant of Fish Audio S2.1 Pro, intended for testing, prototyping, and low-volume applications. It provides the same synthesis capabilities without production latency or availability guarantees.

SpeechFree
S2.1 Pro

S2.1 Pro is a production-oriented text-to-speech model from Fish Audio. It is suited for multilingual voice applications, expressive narration, and dialogue synthesis, with open-ended natural-language controls for speaking style and emotion.

Speech$15/M UTF-8 bytes