Fish Audio: S2.1 Pro Free (free) API status on OpenRouter

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Available from OpenRouter

Catalog profile API ready provider catalog metadata

S2.1 Pro Free is the no-cost variant of Fish Audio S2.1 Pro, intended for testing, prototyping, and low-volume applications.

Check providerOpenAI compatibleTextSpeech

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API Details

Copy-ready connection details

Use these values in your client or SDK.

Base URL

https://openrouter.ai/api/v1

Model ID

fish-audio/s2.1-pro-free-20260729:free

API format OpenAI Chat Completions + OpenAI Responses

Technical Details

Fish Audio: S2.1 Pro Free (free) specifications

Provider catalog

Context window 0

Max output 8K

Status Check provider

Released Jul 29, 2026

Last updated Aug 2, 2026

Free listing since Jul 29, 2026

Input text, speech

Output text

AI Recommendation

Should you use Fish Audio: S2.1 Pro Free (free)?

Fish Audio: S2.1 Pro Free (free) is listed for chat, audio workloads.

Check OpenRouter's current endpoint status before integrating this listing. Use the alternatives table if the provider listing is unavailable.

Best for

Chat
Audio

Strengths & Weaknesses

Strengths

Works with OpenAI-style SDKs

Watch outs

Current endpoint availability needs provider confirmation
Free-tier rate limits apply
Vision support is not listed
Tool calling is not confirmed

Availability

Fish Audio: S2.1 Pro Free (free) availability by provider

Current provider only

We only found this Fish Audio: S2.1 Pro Free (free) listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.

Provider	Model listing	Access	Context	API	Limits
OpenRouter	Fish Audio: S2.1 Pro Free (free)	Check provider	0	OpenAI-style	200 req/day (free tier)

View OpenRouter setup guide →

Compare

Fish Audio: S2.1 Pro Free (free) alternatives to consider

Open comparison

Model	Provider	Context	Access
Ling-3.0-flash (free)	OpenRouter	262K	Free tier
Poolside: Laguna S 2.1 (free)	OpenRouter	262K	Free tier
Poolside: Laguna XS 2.1 (free)	OpenRouter	262K	Free tier
Cohere: North Mini Code (free)	OpenRouter	256K	Free tier
NVIDIA: Nemotron 3.5 Content Safety (free)	OpenRouter	128K	Free tier

Typical Use Cases

Fish Audio: S2.1 Pro Free (free) use cases

Chat

Fish Audio: S2.1 Pro Free (free) is tagged for chat in this catalog and works with OpenAI-compatible client libraries.

Audio

Fish Audio: S2.1 Pro Free (free) is tagged for audio in this catalog and works with OpenAI-compatible client libraries.

FAQ

Fish Audio: S2.1 Pro Free (free) free API FAQ

Is Fish Audio: S2.1 Pro Free (free) free to use?

Fish Audio: S2.1 Pro Free (free) appears in the free model catalog for OpenRouter, but its current endpoint availability should be confirmed with the provider before use.

What is the Fish Audio: S2.1 Pro Free (free) model ID?

The model ID shown in this catalog is fish-audio/s2.1-pro-free-20260729:free.

What are the Fish Audio: S2.1 Pro Free (free) free tier rate limits on OpenRouter?

The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.

More about Fish Audio: 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.

For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.