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Model infoModelsSnapshot: 15 Oct 2026

Alibaba Cloud / CosyVoice hosted

CosyVoice v3.5 Plus

Streaming speech synthesis with custom voices, multilingual delivery and free-form voice instructions.

availableClosed weightsText-to-speech
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
28 of 35 specification fields collected
Text input limit20K20,000
Languages11 listedFull language list in specifications
Input billingSee ratesAlibaba Cloud Model Studio · China (Beijing)
Output billingSee ratesPublished units and conditions below

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Context / input limit
Not collected
Maximum input tokens
Not collected
Maximum output
Not collected
Reasoning
Not collected
Streaming
SupportedSource for Streaming (opens in a new tab)

One-way audio streaming and bidirectional text/audio streaming.

Knowledge cutoff
Not collected
Release date
2026-02-27Source for Release date (opens in a new tab)

China (Beijing) availability.

Parameters
Not collected
Architecture
Not collected
Languages
Chinese, English, French, German, Japanese, Korean, Russian, Portuguese, Thai, Indonesian, VietnameseSource for Languages (opens in a new tab)

Custom-voice synthesis language roster; Chinese includes regional varieties. System voices have separate per-voice language support.

Maximum prompt characters
20,000Source for Maximum prompt characters (opens in a new tab)

Per call or text segment; this is not a token context window.

Streaming text limits
20,000 characters per segment; 200,000 cumulativeSource for Streaming text limits (opens in a new tab)
Output formats
PCM, WAV, MP3, OpusSource for Output formats (opens in a new tab)
Audio sample rates
8000, 16000, 22050, 24000, 44100, 48000Source for Audio sample rates (opens in a new tab)

Hz; default 22,050.

Request mode
WebSocket synthesis with complete text or incremental text inputSource for Request mode (opens in a new tab)
Voice controls
Volume 0–100; rate and pitch 0.5–2.0; MP3/Opus bitrate 6–510 kbpsSource for Voice controls (opens in a new tab)
Voice cloning
SupportedSource for Voice cloning (opens in a new tab)

Beijing supports all four hosted tiers. In Singapore, only v3 Plus supports cloned-voice synthesis; v3 Flash does not.

Voice design
SupportedSource for Voice design (opens in a new tab)

Beijing only. Create the voice separately, bound to this target_model; synthesis is charged normally.

Stock voice catalog
Custom voices only; no system voicesSource for Stock voice catalog (opens in a new tab)
Custom voice quota
1,000 custom voices per account shared across cloning/design and the supported speech modelsSource for Custom voice quota (opens in a new tab)

At quota, new creation fails; existing voices are not automatically evicted.

Custom voice retention
Unused custom voices are automatically deleted after one year without synthesis; otherwise valid until deletedSource for Custom voice retention (opens in a new tab)

Voice-resource retention is separate from inference-request retention.

Reference audio
Clone enrollment: WAV (16-bit), MP3 or M4A; ≤60 seconds and ≤10 MB; sample rate ≥16 kHzSource for Reference audio (opens in a new tab)

10–20 seconds recommended. At least 5 seconds of clear continuous speech; stereo uses only the first channel. Singing and background audio are unsuitable.

Voice design limits
Description ≤500 characters; preview text 15–200 characters; Chinese or EnglishSource for Voice design limits (opens in a new tab)

The resulting voice is bound to target_model and cannot be reused across models. Voice creation is free; synthesis is not.

Audio direction
Free-form instructions for custom voicesSource for Audio direction (opens in a new tab)

Instruction maximum: 100 weighted characters. The guide lists instruction-language support separately from speech-output languages.

Word timestamps
Available during streaming for cloned voices and supported system voicesSource for Word timestamps (opens in a new tab)

Check the individual voice entry; not a blanket promise for every designed/system voice.

Data retention
Standard API inference prompts and responses are retained for up to 30 days, subject to legal/security exceptions; stateful files remain until deleted. CosyVoice is absent from the published list of ZDR-supported audio families.Source for Data retention (opens in a new tab)
Usage metering
Input characters; output has no separate chargeSource for Usage metering (opens in a new tab)

Chinese characters, Japanese kanji and Korean hanja count as 2; other characters count as 1. SSML tags are excluded.

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

Alibaba Cloud Model Studio · China (Beijing)

Provider source (opens in a new tab)
API model ID
cosyvoice-v3.5-plus
Access
wss://{WorkspaceId}.cn-beijing.maas.aliyuncs.com/api-ws/v1/inference; run-task with model=cosyvoice-v3.5-plus. Same-region API key and compatible voice required.
Regions
China (Beijing). Deployment scope is not a country-only residency guarantee.
Streaming
SupportedSource for Streaming (opens in a new tab)

One-way audio streaming and bidirectional text/audio streaming.

Voice design
SupportedSource for Voice design (opens in a new tab)

The dedicated voice-design guide supports Beijing only.

Published request quota
180 requests/minuteSource for Published request quota (opens in a new tab)
Included free allowance
No free quotaSource for Included free allowance (opens in a new tab)

International-account USD tariff; do not mix with domestic CNY-account promotions.

Prices retain their published currencies and billing units below.

Published billing units · original currency · observed 14 Oct 2026
CategoryUsageRateUnit
Speech synthesisSpeech synthesis1$0.2210,000 input characters

Rate conditions

  1. Original China (Beijing) list rate, excluding promotions. Output has no separate charge. Chinese characters/kanji/hanja count as 2; other characters count as 1; SSML tags are excluded. Voice creation is a separate free workflow; inference is charged at this rate. No FX conversion.
Pricing source (opens in a new tab)

Data & enterprise terms

Standard API inference prompts and responses are retained for up to 30 days, subject to legal/security exceptions; stateful files remain until deleted. CosyVoice is absent from the published list of ZDR-supported audio families.

Read the service policy (opens in a new tab)

Caching

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.

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

Inference from the distinct hosted release selector, official deployment documentation and reviewed Qwen/FunAudioLLM public-weight inventories. No corresponding weights or mapping to a published checkpoint were verified. This classification applies to the hosted tier, not to the public CosyVoice or Qwen model family. Private lineage and parameter counts remain undisclosed.

Classification evidence (opens in a new tab)

Lifecycle dates

China (Beijing) release27 Feb 2026Source (opens in a new tab)

Sources reviewed