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Model infoModelsSnapshot: 15 Oct 2026

Cursor / Composer

Composer 1

First-generation Cursor coding agent model, trained for fast search, editing and terminal-based development.

historicalClosed weightsCoding
Official documentation (opens in a new tab)Reviewed 15 Oct 2026
6 of 17 specification fields collected
Context windowNot collectedAwaiting source review
Maximum outputNot collectedAwaiting source review
Input billingNot collectedCursor editor · historical Composer 1
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

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Maximum input tokens
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Maximum output
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Parameters
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Reasoning
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Tool calling
SupportedSource for Tool calling (opens in a new tab)

Trained for the Cursor agent tool harness. Not a claim of arbitrary OpenAI-compatible function-call schemas.

Structured output
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Streaming
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Batch processing
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Fine-tuning
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Context caching
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Knowledge cutoff
Not collected

Exact version-specific model contract not established. Product capabilities do not automatically establish a standalone inference API feature.

Input modalities
TextSource for Input modalities (opens in a new tab)

Native image support is not established here; agent tools can handle media without proving model-native generation/vision.

Architecture
Mixture-of-experts coding model; parameter count not disclosed.Source for Architecture (opens in a new tab)
Published training method
Reinforcement learning in sandboxed software-development environments, with search, edit and terminal tools.Source for Published training method (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.

Cursor editor · historical Composer 1

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

Exact exposed model identifier or current account entitlement not established.

Access
Released in Cursor; current availability and selector need confirmation in the product.
Regions
Default model-specific processing region not established. Enterprise US-only residency can cover Composer when configured; external integrations have separate boundaries.

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

Data & enterprise terms

With Privacy Mode enabled, code is not used for training by Cursor or model providers. Custom-model inference providers may process it. Cloud Agents store encrypted repository copies during execution, with deletion after completion described by the provider. These claims do not establish unconditional zero retention for every feature or account.

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.

Cursor editor · historical Composer 1

Not verified

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

How it works
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

Minimum reusable input
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

Lifetime & refresh
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

How to enable it
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

Usage fields
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

Billing rules
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

Limits & data boundaries
Not collected

No exact-version prompt-cache contract established. Internal KV reuse, code indexing and self-summarization are not a published cache discount.

No verified cache rate for this endpoint. An empty rate is not a zero charge.

Caching reviewed 15 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

Cursor describes its own post-trained coding model, distributed through its product. Composer 2 is described among proprietary models in its technical report. Private classification for other Composer generations is inferred from this product/research lineage; their exact weight license is not published in the reviewed sources. Public Kimi K2.5 base weights do not constitute a release of the Composer derivative.

Classification evidence (opens in a new tab)

Lifecycle dates

Model release announced29 Oct 2025Source (opens in a new tab)

Sources reviewed