Project AURIONAI Use-Cases Research & Innovation
code

Composer 2.5

Cursor's coding model, post-trained from Kimi K2.5 with 25x more synthetic coding tasks than Composer 2; parity claims with Opus 4.7 and GPT-5.5 unscored (unverified).

Anysphere (Cursor)Anysphere (Cursor)USAComposerFamily
Anysphere (Cursor)
Levelmodel
Classcode
Parametersnot in the notes
Contextnot in the notes
Released19 May 2026
Opennessproprietary
Runs onnot in the notes
Statusactive

Lineage

successorfinetune
Composer 2 to Composer 2.5: successor, medium confidenceKimi K2.5 to Composer 2.5: finetune, medium confidenceKimi K2.5 to Kimi K2.6: successor, medium confidenceKimi K2 Thinking to Kimi K2.5: successor, medium confidenceKimi K2 ThinkingKimi K2 ThinkingMoonshot AIKimi K2.5Kimi K2.5Moonshot AI, Jan 2026Composer 2Composer 2Anysphere (Cursor), Mar 2026Kimi K2.6Kimi K2.6Moonshot AI, Apr 2026Composer 2.5Composer 2.5Anysphere (Cursor), May 2026
Anysphere (Cursor)Composer 2 is the parent (successor)medium confidencenotes
Moonshot AIKimi K2.5 is the parent (finetune)medium confidencepress claim
Where this comes from
Parent and child relations from model cards, Hugging Face base_model fields and the genealogy tables of the research notes. The tree shows two generations each way, 5 models. Confidence and evidence are the notes' own.

R&D Topics

Agentic software engineeringproduced byCode language modelsproduced by

Identity

Developer
Anysphere (Cursor)
Family
Composer
Released
19 May 2026 sourcessecondary report
Weights published
–
Record checked
10 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.

Architecture and Size

Architecture
not in the notes
Total parameters
– sources
Active parameters
–
Checkpoint parameters
–
Context length
not in the notes
Input
text
Output
text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).

Openness and Access

Openness
proprietary
Licence
Proprietary sources
Access routes
consumer app
Where this comes from
The licence file governs over registry tags and aggregator labels.

Deployment

Runs on
not in the notes
Footprint
Cursor only. Partly trained on Colossus 2.
Runtimes
not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.

Indonesia

Indonesian support
not stated
Regional languages
not in the notes
Jakarta hosting
unknown
Languages
not in the notes
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.

Benchmark Results

The notes record no benchmark result for this model.

Industry Use Cases

No industry use case links this model.

Sources

  1. framia.converge.ai/page/en-US/news/cursor-composer-2-5-kimi-codi... https://framia.converge.ai/page/en-US/news/cursor-composer-2-5-kimi-coding-model

To cite this page: Project AURION, AI Use-Cases Research & Innovation, "Composer 2.5", https://aurion.semai.id/models/anysphere-composer-2-5/, records of October 2026.