Audio modelActive
Fish Audio S2.1 Pro
Fish Audio
- Released
- June 23, 2026
- Data date
- October 3, 2026
- Model class
- Languages
- Access
Fish Audio S2.1 Pro is the API endpoint for the newer S2.1 generation. It produces multilingual speech, supports voice cloning, and responds in about 90 milliseconds to first audio.
The free identifier s2.1-pro-free is announced through November 30, 2026 under fair-use rules and without an SLA. The offer’s terms govern data retention and commercial use. No separate S2.1 weights checkpoint is published.
Specifications and access
| Specification | Value and source |
|---|---|
| Model class | Speech synthesisSource |
| Access | Fish Audio APISource |
| Input | Text with voice and emotion controlSource |
| Output | Multilingual speechSource |
| API model ID | s2.1-pro-freeSource |
| Languages | 83 languagesSource |
| Latency | About 90 milliseconds to first audioSource |
| Usage conditions | No SLA or guaranteed latency; possible retention and commercial-use restrictions applySource |
Measurements without matching peer values
These measurements have no matching peer values under the same test conditions. Their original values and sources remain available here.
win rate versus S2 Pro (Show measurement, test conditions, and source)
- Source value
- 61
- Score
- 61
- Metric
- win rate
- Unit
- %
- Benchmark version
- source version not stated
- Category
- audio
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Fish Audio S2.1 announcement
- Status
- active
- Retrieved at
- 2026-10-04
- Methodology
- Vendor-reported result. Provider blind listening; exact sample count not stated in announcement
- Context
- Source-specific observation; it does not establish a compatible cross-model cohort.
Published prices
Prices apply to the stated unit. Resolution, output length, and provider can change the cost.
- Free API access
- Free through 2026-11-30 under fair-use rules; changes with advance noticeSource
Sources and data date
Every statement links to its underlying documentation or leaderboard.
| Type | Evidence and data date |
|---|---|
| Research status | Research date October 4, 2026. 1 source URLs checked. This documents the inspected sources, not an exhaustive inventory of every publication. |
| Additional source | Fish Audio S2.1 Pro API announcement (retrieved October 3, 2026; October 4, 2026) · Fish Audio S2.1 Pro API announcement · Editorial description reviewed October 3, 2026 |
| Additional source | Fish Audio S2 open-source announcement (retrieved October 3, 2026) · Fish Audio S2 open-source announcement · Editorial description reviewed October 3, 2026 |