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Composer 1.5 vs DeepSeek-LLM

Cursor Composer 1.5 vs DeepSeek DeepSeek-LLM — side-by-side specs.

Cursor
Composer 1.5
DeepSeek
DeepSeek-LLM
Overview
CompanyCursorDeepSeek
Release dateFeb 8 2026Nov 29 2023
Model type
Open sourceNoYes
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
Software engineering
SWE-Bench Verified
Multimodal understanding
MMMU
Timeline
Release gapDeepSeek-LLM shipped 802 days before Composer 1.5

Which is better: Composer 1.5 or DeepSeek-LLM?

Composer 1.5 and DeepSeek-LLM do not have directly comparable benchmark scores published on GPQA Diamond, SWE-Bench Verified, or MMMU. DeepSeek-LLM shipped 802 days before Composer 1.5, so benchmark comparisons should account for the intervening progress.

DeepSeek-LLM is an open-source / open-weight model; Composer 1.5 is proprietary.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Composer 1.5 released?
Composer 1.5 was released by Cursor on Feb 8 2026.
When was DeepSeek-LLM released?
DeepSeek-LLM was released by DeepSeek on Nov 29 2023.
Is Composer 1.5 or DeepSeek-LLM open source?
DeepSeek-LLM is an open-source / open-weight model released by DeepSeek. Composer 1.5 is a proprietary model released by Cursor.

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