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Model infoModelsSnapshot: 15 Oct 2026

Microsoft AI / MAI-1-preview

MAI-1-preview

Microsoft’s early in-house language model, publicly tested on LMArena and announced for selected Copilot text experiences in August 2025.

historicalClosed weightsText generation
Official documentation (opens in a new tab)Reviewed 14 Oct 2026
5 of 18 specification fields collected
Context windowNot collectedAwaiting source review
Maximum outputNot collectedAwaiting source review
Input billingNot collectedLMArena (historical public test)
Output billingNot collectedNo inferred price

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
Not collected
Parameters
Not collected
Knowledge cutoff
Not collected
Languages
Not collected
Context caching
Not collected
Architecture
Mixture of expertsSource for Architecture (opens in a new tab)
Endpoint availability
Historical LMArena public test and planned Copilot rollout. A current independently callable API and retirement date have not been verified.Source for Endpoint availability (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.

LMArena (historical public test)

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

No public API model selector documented.

Access
Public evaluation announced on 28 August 2025. Current selection and routing are unverified.
Regions
Not verified for this model version.

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

Data & enterprise terms

Model-specific retention and training-use policy not collected.

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.

LMArena (historical public test)

Not verified

No endpoint-specific cache contract verified for this version.

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.

Caching reviewed 14 Oct 2026

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

Microsoft documents this as its internally developed MAI model, distributed through hosted Microsoft products or services. The reviewed materials provide no downloadable weights for this named model. Public Phi and MAI-DS-R1 families are not included by inference.

Classification evidence (opens in a new tab)

Sources reviewed