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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

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

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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.