S2.1 Pro model profile
Evidence snapshot:
S2.1 Pro is a Fish Audio model profile with a no verified token context limit in this snapshot. The dated catalog snapshot records text, speech modalities and interfaces for speech synthesis.
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...
S2.1 Pro is a reference profile: Fish Audio publishes it, Kendr documents it for comparison, and it carries no Kendr alias to call.
S2.1 Pro is an independent knowledge profile. It does not claim that Kendr hosts the model, quote a Kendr customer price, promise API availability, or advertise a Kendr routing receipt.
S2.1 Pro accepts text and returns speech. The snapshot records speech synthesis as capabilities or interfaces.
The dated unit-price records list $0.000015 per character for input_text. Each figure retains its billable dimension, variant, provider, source, and evidence date.
No comparable third-party benchmark value is present in the 2026-09-06 snapshot. Missing values are not estimated.
No comparable popularity rank or traffic share is present in the 2026-09-06 snapshot. No comparable routing rank or traffic-share observation is attached to this dated profile; missing adoption evidence is not estimated.
Profile data was reviewed for the 2026-09-06 snapshot. Claims retain their source dates, and unavailable fields are shown as unavailable instead of estimated.
Profile facts
- Profile type
- Model research profile
- Provider or publisher
- Fish Audio
- Context window
- No verified limit
- Snapshot date
- 2026-09-06
- Knowledge cutoff
- Not disclosed
- Reference catalog ID
- fish-audio/s2.1-pro
When to pick S2.1 Pro
S2.1 Pro is a reference profile: Fish Audio publishes it, Kendr documents it for comparison, and it carries no Kendr alias to call.
Each condition below is derived from this model's own values in the 2026-09-06 snapshot, compared only against models publishing the same field.
- Reach for it when the output is speech. This route produces speech rather than only text, and those units are priced separately from tokens.
- Look elsewhere when you need to call it through Kendr today. This is a research reference profile with no Kendr alias. The facts and evidence here are published for comparison; the model is not routable on Kendr.
- Look elsewhere when you are building an agent. No tool-calling capability is recorded for this model in the snapshot. Agent loops need a route that can call functions.
Context, modalities, and identity
S2.1 Pro accepts text and returns speech. The snapshot records speech synthesis as capabilities or interfaces.
- Provider or publisher
- Fish Audio
- Context window
- No verified limit
- Maximum output
- No verified numeric limit
- Input modalities
- text
- Output modalities
- speech
- Knowledge cutoff
- Not disclosed
Model overview
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...
- Reference model ID
- fish-audio/s2.1-pro
- Canonical version
- fish-audio/s2.1-pro-20260729
- Hugging Face ID
- Not separately documented
Capabilities and supported controls
Capabilities and parameters are reported from the dated catalog and source records; their presence does not guarantee identical behavior across every provider route.
- Supported parameters
- No verified parameter list
- speech synthesis
Dated pricing snapshot
The dated unit-price records list $0.000015 per character for input_text. Each figure retains its billable dimension, variant, provider, source, and evidence date.
These are dated third-party reference prices, not Kendr prices or an availability offer. Routes, tiers, caching, region, and provider policy can change the landed price.
- Price date
- 2026-09-06
- Input
- No verified rate
- Cached input
- No verified rate
- Output
- No verified rate
| Billable | Variant | Cost | Unit | Provider | As of |
|---|---|---|---|---|---|
| input_text | Default | $0.000015 | per character | Not specified | 2026-09-06 |
Provider routes, performance, and uptime
The snapshot retains 1 provider endpoint. Provider prices, context limits, p50 performance, and uptime can differ by route and are not Kendr guarantees.
- Active provider endpoints
- 1
- Best p50 latency
- No recent metric
- Best p50 throughput
- No recent metric
- Availability with routing
- No recent metric
- Availability without routing
- No recent metric
- Performance date
- 2026-09-06
| Provider | Quantization | Input / 1M | Output / 1M | Cache read / 1M | Context | p50 latency | p50 throughput | Uptime (1d) |
|---|---|---|---|---|---|---|---|---|
| Fish Audio | unknown | $15 / 1M | $0 / 1M | No verified rate | 0 tokens | No recent p50 | No recent p50 | 100.00% |
Benchmark evidence and limitations
No comparable third-party benchmark value is present in the 2026-09-06 snapshot. Missing values are not estimated.
Third-party catalog fields normalized from the cited model dataset; benchmark methodology and coverage differ by source.
Popularity and market context
No comparable popularity rank or traffic share is present in the 2026-09-06 snapshot. No comparable routing rank or traffic-share observation is attached to this dated profile; missing adoption evidence is not estimated.
- Third-party catalog rank
- No verified rank
- Global market share
- Not inferred
- Observation date
- 2026-09-06
Frequently asked questions
When should I use S2.1 Pro?
S2.1 Pro is a reference profile: Fish Audio publishes it, Kendr documents it for comparison, and it carries no Kendr alias to call. Reach for it when the output is speech: This route produces speech rather than only text, and those units are priced separately from tokens. Look elsewhere when you need to call it through Kendr today: This is a research reference profile with no Kendr alias. The facts and evidence here are published for comparison; the model is not routable on Kendr. Look elsewhere when you are building an agent: No tool-calling capability is recorded for this model in the snapshot. Agent loops need a route that can call functions.
What is S2.1 Pro?
S2.1 Pro is a Fish Audio model profile with a no verified token context limit in this snapshot. The dated catalog snapshot records text, speech modalities and interfaces for speech synthesis.
Does S2.1 Pro have a verified token context window?
No comparable token context window is present in this dated profile. The page reports text inputs, speech outputs, and source-backed modality limits instead of inventing a token limit.
What benchmark evidence is available for S2.1 Pro?
No comparable third-party benchmark value is present in the 2026-09-06 snapshot. Missing values are not estimated. Third-party catalog fields normalized from the cited model dataset; benchmark methodology and coverage differ by source.
Is S2.1 Pro available through Kendr?
This is an independent knowledge profile, not a Kendr-hosted availability claim. Check Kendr's live public model API for currently enabled Kendr aliases.
Does the popularity rank represent S2.1 Pro's global market share?
No comparable popularity rank or traffic share is present in the 2026-09-06 snapshot. No comparable routing rank or traffic-share observation is attached to this dated profile; missing adoption evidence is not estimated. No global market-share percentage is inferred when the source does not publish one.
Sources and evidence dates
- S2.1 Pro third-party catalog record (catalog, checked 2026-09-06)
- Third-party model catalog methodology (methodology, checked 2026-09-06)
- Fish Audio official model documentation (primary, checked 2026-09-06)
- S2.1 Pro third-party catalog record (catalog, checked 2026-09-06)