/ ByteDance / Seed TTS 2.0 ByteDance / Seed TTS
Seed TTS 2.0 Conversational speech synthesis with prompt controls, context-aware delivery and sentence emotion tags.
available Closed weights Text-to-speech
Context window Not collected Awaiting source review
Maximum output Not collected Awaiting source review
Input billing See rates BytePlus Seed Speech
Output billing See rates Published units and conditions below
Specifications Access & pricing Caching Voices Evaluation Sources & lifecycle
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 output Not collected
Reasoning Not collected
Tool calling Not collected
Structured output Not collected
Batch processing Not collected
Fine-tuning Not collected
Knowledge cutoff Not collected
Release date Not collected
Parameters Not collected
Architecture Not collected Languages View all 18 entries American English Chinese Japanese Indonesian Bahasa Indonesian Thai Vietnamese Korean Malay Filipino Mexican Spanish Brazilian Portuguese Arabic German Spanish French Italian Russian Source for Languages (opens in a new tab) Voice-specific language support; not every voice supports every listed language.
Access & pricing Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.
API model ID seed-tts-2.0Provider model selector or X-Api-Resource-Id as documented; it is not a user voice ID.
Access Enable Seed Speech for an eligible BytePlus account and use the documented resource selector. Voice permissions and concurrency limits apply.
Regions ap-southeast-1 API endpoint; other regions not verified Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 12 Oct 2026 Category Usage Rate Unit Speech synthesis Input text1 $30.00 1M characters
Rate conditions Published Seed TTS service-level PAYG rate; no model-version surcharge is stated. Letters, Chinese characters, punctuation, spaces and line breaks count. Optional concurrency and prepaid packages are separate. Pricing source (opens in a new tab) Data & enterprise terms Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.
API model ID seed-tts-2.0Provider model selector or X-Api-Resource-Id as documented; it is not a user voice ID.
Access Enable Seed Speech for an eligible BytePlus account and use the documented resource selector. Voice permissions and concurrency limits apply.
Regions ap-southeast-1 API endpoint; other regions not verified Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 12 Oct 2026 Category Usage Rate Unit Speech synthesis Input text1 $30.00 1M characters
Rate conditions Published Seed TTS service-level PAYG rate; no model-version surcharge is stated. Letters, Chinese characters, punctuation, spaces and line breaks count. Optional concurrency and prepaid packages are separate. Pricing source (opens in a new tab) Data & enterprise terms Retention, training use, regional processing and enterprise terms have not been summarized for this endpoint.
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 INPUT Process & retain The system processes eligible input and retains reusable state.
02 / LATER REQUEST Check available state Reuse depends on matching input, session state and the cache policy.
03 / CACHE HIT Reuse & generate Reusing state can reduce repeated work. Any charges follow the billing rules below.
BytePlus Seed Speech · Unidirectional streaming HTTP seed-tts-2.0Documented Support evidence (opens in a new tab) Minimum reusable input Not collected No minimum text length documented.
Billing rules Not collected No cache-hit discount or separate storage charge verified.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Caching reviewed 12 Oct 2026
BytePlus Seed Speech · Bidirectional streaming WebSocket seed-tts-2.0Not verified
How it works Not collected
Minimum reusable input Not collected
Lifetime & refresh Not collected
How to enable it Not collected
Usage fields Not collected
Billing rules Not collected
Limits & data boundaries Not collected No verified cache rate for this endpoint. An empty rate is not a zero charge.
Voice choices 177 voices Choose a voice within Seed TTS 2.0. These are API voice identifiers, not additional model releases. Source links document each voice.
Find a voice Published voice catalog Voice / API ID Language & accent Delivery Stokieen_female_stokie_uranus_bigtts American English General. A trendy, casual, and expressive young female voiceVoice source (opens in a new tab) Daceyen_female_dacey_uranus_bigtts American English General. A crisp, confident, and engaging young female voiceVoice source (opens in a new tab) Timen_male_tim_uranus_bigtts American English General. A clear, versatile, and friendly mid-range male voiceVoice source (opens in a new tab) Blairen_female_nadia_uranus_bigtts American English General. A young American female voice—clean and clear, with a gentle, relaxed way of speakingVoice source (opens in a new tab) Kevinen_male_kevin_uranus_bigtts American English Education. A young, clear, and friendly American male voice with fluent, articulate deliveryVoice source (opens in a new tab) Jamieen_male_jamie_uranus_bigtts American English General. A hearty male voice—sincere and candid, witty and full of energyVoice source (opens in a new tab) Hayleyen_female_hayley_uranus_bigtts American English Education. A lively female voice with strong emotional tension, skilled at storytellingVoice source (opens in a new tab) Skyeen_female_skye_uranus_bigtts American English General. A clear, candid older sister who speaks sincerely and from the heartVoice source (opens in a new tab)
Show all 177 voices
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 Inferred from the native hosted model/resource identifier and the reviewed ByteDance/ByteDance-Seed public-checkpoint inventories. These inventories contain no matching released checkpoint; this is not an explicit weight-license declaration.
Classification evidence (opens in a new tab) Sources reviewed