Composer 1.5
Composer 1.5 is an API-only (closed weights) language model from Cursor, released February 9, 2026.
Our new release, Composer 1.5, strikes a strong balance between speed and intelligence for daily use. Composer 1.5 was built by scaling reinforcement learning 20x further on the same pretrained model. The compute used in our post-training of Composer 1.5 even surpasses the amount used to pretrain the base model.
Check it against your own PC →
Lab
Cursor
Released
February 9, 2026
Weights
API-only (closed weights)
Parameters
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Context
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Price / M tokens
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Epoch ECI
not yet rated
Benchmark results
Epoch AI has not published results for Composer 1.5 yet. New models are usually evaluated within days to weeks.