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Model infoModelsSnapshot: 15 Oct 2026

NTT / tsuzumi

tsuzumi 0.6B (original)

Original tsuzumi size tier announced in 2023. This preserves the historical generation separately from later documented instruction revisions.

historicalClosed weightsText generation
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
8 of 19 specification fields collected
Context windowNot collectedAwaiting source review
Maximum outputNot collectedAwaiting source review
Input billingSee billing notesNTT tsuzumi (historical generation)
Output billingSee billing notesAccess and billing notes 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
Tool calling
Not collected
Structured output
Not collected
Streaming
Not collected
Batch processing
Not collected
Fine-tuning
SupportedSource for Fine-tuning (opens in a new tab)

Provider-supported adapter tuning at the family level; not a self-service public training API for this exact historical checkpoint.

Knowledge cutoff
Not collected
Release date
2023-11-01Source for Release date (opens in a new tab)

Announcement date. Commercial family services began on 25 March 2024.

Architecture
Not collected
Context caching
Not collected
Deployment
CPU inference; enterprise deploymentSource for Deployment (opens in a new tab)
Published price
Enterprise service or private deployment; no reviewed numeric tariff for this historical tierSource for Published price (opens in a new tab)

Access & pricing

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

NTT tsuzumi (historical generation)

Provider source (opens in a new tab)
API model ID
Not collected

No independently callable public model selector verified for this access reference.

Access
Commercial family reference. Original exact checkpoint IDs and current per-tier sales availability are not pinned.
Regions
Contract, deployment and NTT group service determine availability and data location.

Endpoint pricing has not been collected. Check the provider for applicable rates.

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 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.

NTT tsuzumi (historical generation)

Not 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.

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

NTT identifies this as its proprietary, independently developed product model, distributed through commercial services and private deployments. No matching public checkpoint release was verified. Closed-weight classification is inferred for the exact product identity, not from provider ownership alone.

Classification evidence (opens in a new tab)

Lifecycle dates

Model family announced1 Nov 2023Source (opens in a new tab)
Commercial family services launched25 Mar 2024Source (opens in a new tab)

Sources reviewed