Full-sized proprietary speech model with 13 languages and parenthesized emotion controls. Scheduled to be replaced behind its API selector at the end of 2026.
Text chunks 100–300 characters; min chunk 0–100. max_new_tokens defaults to 1,024 audio tokens per chunk. Temperature/top_p 0–1; latency normal/balanced/lowSource for Generation controls (opens in a new tab)
Chunk controls are not total input or output limits. Internal batching is not a public batch API.
Thresholds measure total prepaid funds, not spend. All keys and ASR share the pool; 429 responses have no Retry-After header. Free-tier fair-use conditions also apply.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech synthesis
Speech synthesis1
$15.00
1M UTF-8 bytes
Rate conditions
Native input text measured in UTF-8 bytes, not Unicode characters or LLM tokens. Pay as you go without a monthly minimum. S1 pricing applies before its scheduled replacement.
Fish Audio terms permit Usage Data and Content to improve its models, including third-party components. Public terms do not establish universal zero retention. Free S2.1 has no DPA or TTFA guarantees; confirm production contractual terms separately. Voice inputs require appropriate rights.
Thresholds measure total prepaid funds, not spend. All keys and ASR share the pool; 429 responses have no Retry-After header. Free-tier fair-use conditions also apply.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech synthesis
Speech synthesis1
$15.00
1M UTF-8 bytes
Rate conditions
Native input text measured in UTF-8 bytes, not Unicode characters or LLM tokens. Pay as you go without a monthly minimum. S1 pricing applies before its scheduled replacement.
Fish Audio terms permit Usage Data and Content to improve its models, including third-party components. Public terms do not establish universal zero retention. Free S2.1 has no DPA or TTFA guarantees; confirm production contractual terms separately. Voice inputs require appropriate rights.
Thresholds measure total prepaid funds, not spend. All keys and ASR share the pool; 429 responses have no Retry-After header. Free-tier fair-use conditions also apply.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech synthesis
Speech synthesis1
$15.00
1M UTF-8 bytes
Rate conditions
Native input text measured in UTF-8 bytes, not Unicode characters or LLM tokens. Pay as you go without a monthly minimum. S1 pricing applies before its scheduled replacement.
Fish Audio terms permit Usage Data and Content to improve its models, including third-party components. Public terms do not establish universal zero retention. Free S2.1 has no DPA or TTFA guarantees; confirm production contractual terms separately. Voice inputs require appropriate rights.
Thresholds measure total prepaid funds, not spend. All keys and ASR share the pool; 429 responses have no Retry-After header. Free-tier fair-use conditions also apply.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech synthesis
Speech synthesis1
$15.00
1M UTF-8 bytes
Rate conditions
Native input text measured in UTF-8 bytes, not Unicode characters or LLM tokens. Pay as you go without a monthly minimum. S1 pricing applies before its scheduled replacement.
Fish Audio terms permit Usage Data and Content to improve its models, including third-party components. Public terms do not establish universal zero retention. Free S2.1 has no DPA or TTFA guarantees; confirm production contractual terms separately. Voice inputs require appropriate rights.
OpenRouter prompt/response logging and improvement use are opt-in; metadata is retained. Upstream provider policies remain separate, so routing through OpenRouter does not itself establish Fish Audio zero retention.
Listed in the public AI Gateway model catalog. Use a supported speech/transcription SDK specification; native HTTP contracts are not presumed identical.
Regions
Processing region and residency not established for this access path.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech synthesis
Speech synthesis1
$15.00
1M characters
Rate conditions
Uses the catalog’s dedicated speech_input_character_cost field. Generic input fields are not treated as LLM token prices. Native Fish byte units are not substituted for gateway character units.
The catalog labels this model zdr=none and no_training=none. No zero-retention or no-training guarantee is inferred; confirm host and upstream terms for the intended workload.
Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.
01 / INITIAL INPUTProcess & retain
The system processes eligible input and retains reusable state.
02 / LATER REQUESTCheck available state
Reuse depends on matching input, session state and the cache policy.
03 / CACHE HITReuse & generate
Reusing state can reduce repeated work. Any charges follow the billing rules below.
Fish Audio API
s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Fish Audio API
s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Fish Audio API
s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Fish Audio API
s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
OpenRouter
fish-audio/s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Vercel AI Gateway
fish-audio/s1
Not verified
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How it works
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
How to enable it
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Usage fields
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Billing rules
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache contract or discount established. Voice references and previous-chunk conditioning are not billed prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
What the measurements say
No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.
Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.
The record behind the model
Why it is included
The official S1-mini model card explicitly identifies the full S1 4B model as proprietary. The downloadable 0.5B distilled S1-mini is a different release.
