IDs are scoped to one stream/job. Word confidence is unpopulated: omitted in async, zero in sync/stream. A zero is not measured recognition confidence.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech recognition
Transcription · On-Demand1
$0.15
audio hour
Speech recognition
Transcription · Creator2
$0.10
audio hour
Subscription
Plan fee · Creator3
$25.00
month
Speech recognition
Transcription · Builder4
$0.10
audio hour
Subscription
Plan fee · Builder5
$100.00
month
Speech recognition
Transcription · Developer6
$0.10
audio hour
Subscription
Plan fee · Developer7
$300.00
month
Speech recognition
Transcription · Growth8
$0.10
audio hour
Subscription
Plan fee · Growth9
$1,500.00
month
Rate conditions
On-Demand plan: pay as you go after included trial credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Creator plan costs $25/month and includes $25 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $25 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Builder plan costs $100/month and includes $100 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $100 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Developer plan costs $300/month and includes $300 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $300 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Growth plan costs $1500/month and includes $1500 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $1500 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
The STT policy states sync/WebSocket audio and transcripts are processed in memory and redacted after processing; usage metadata remains. It states STT audio is not used for training. General ZDR controls and account entitlement still need workspace-specific confirmation.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech recognition
Transcription · On-Demand1
$0.15
audio hour
Speech recognition
Transcription · Creator2
$0.10
audio hour
Subscription
Plan fee · Creator3
$25.00
month
Speech recognition
Transcription · Builder4
$0.10
audio hour
Subscription
Plan fee · Builder5
$100.00
month
Speech recognition
Transcription · Developer6
$0.10
audio hour
Subscription
Plan fee · Developer7
$300.00
month
Speech recognition
Transcription · Growth8
$0.10
audio hour
Subscription
Plan fee · Growth9
$1,500.00
month
Rate conditions
On-Demand plan: pay as you go after included trial credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Creator plan costs $25/month and includes $25 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $25 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Builder plan costs $100/month and includes $100 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $100 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Developer plan costs $300/month and includes $300 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $300 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Growth plan costs $1500/month and includes $1500 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $1500 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
The STT policy states sync/WebSocket audio and transcripts are processed in memory and redacted after processing; usage metadata remains. It states STT audio is not used for training. General ZDR controls and account entitlement still need workspace-specific confirmation.
Prices retain their published currencies and billing units below.
Published billing units · original currency · observed 13 Oct 2026
Category
Usage
Rate
Unit
Speech recognition
Transcription · On-Demand1
$0.15
audio hour
Speech recognition
Transcription · Creator2
$0.10
audio hour
Subscription
Plan fee · Creator3
$25.00
month
Speech recognition
Transcription · Builder4
$0.10
audio hour
Subscription
Plan fee · Builder5
$100.00
month
Speech recognition
Transcription · Developer6
$0.10
audio hour
Subscription
Plan fee · Developer7
$300.00
month
Speech recognition
Transcription · Growth8
$0.10
audio hour
Subscription
Plan fee · Growth9
$1,500.00
month
Rate conditions
On-Demand plan: pay as you go after included trial credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Creator plan costs $25/month and includes $25 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $25 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Builder plan costs $100/month and includes $100 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $100 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Developer plan costs $300/month and includes $300 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $300 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
Growth plan costs $1500/month and includes $1500 in shared product credits. Usage consumes credits at this plan rate; subscription fee is not an additional charge per request. Monthly credits roll over for up to three months under plan conditions; purchased top-ups expire after one year. Audio duration billing; no text-token or batch discount assumed. Taxes, custom enterprise terms and optional add-ons are separate.
Monthly subscription includes $1500 shared credits consumed at the plan’s unit rates. Annual subscriptions and custom agreements are separate. Do not add this full fee to each synthesis.
The async guide explicitly stores submitted audio and transcript for seven days. The ZDR guide’s sync/WebSocket in-memory claims are not automatically transferred to async jobs. No blanket async zero-retention guarantee is established.
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.
Inworld API
inworld/inworld-stt-1
Not verified
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How it works
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How to enable it
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Usage fields
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Billing rules
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Inworld API
inworld/inworld-stt-1
Not verified
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How it works
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How to enable it
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Usage fields
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Billing rules
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
No verified cache rate for this endpoint. An empty rate is not a zero charge.
Inworld API
inworld/inworld-stt-1
Not verified
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How it works
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Minimum reusable input
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Lifetime & refresh
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
How to enable it
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Usage fields
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Billing rules
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish prompt caching.
Limits & data boundaries
Not collected
No model-specific prompt-cache mechanism, lifetime or cached-token price established. Free synthesisContext text and reusable voice profiles do not establish 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
Inworld grants limited service/model access and reserves model IP under its proprietary terms, including separately contracted customer-hosted deployment. The TTS-1 research release publishes training/modeling code, not the production TTS model weights. Current TTS/STT release identities are established in the native catalog; routed third-party models are excluded.
