Composer 2

Training compute

2.3×10²⁵ FLOP

Parameters

1T

Published

Mar 19, 2026

Composer 2 is an AI model developed by Cursor (United States), first published in March 2026. It works in the language domain, on tasks such as coding.

Training it took an estimated 2.3×10²⁵ FLOP of compute. The model has 1,040,000,000,000 parameters. Training ran on NVIDIA B300 (Blackwell Ultra).

Access: API access. Its weights are not openly released. It is built on top of Kimi K2.5. Epoch AI rates the confidence of this record as confident.

Full record

Organization: Cursor
Country of organization: United States
Domain: Language
Task: Coding
Training compute: 2.3×10²⁵ FLOP
Parameters: 1,040,000,000,000
Training hardware: NVIDIA B300 (Blackwell Ultra)
Model accessibility: API access
Open weights: No
Base model: Kimi K2.5
Epoch confidence: Confident