Composer 1.5 vs DeepSeek V3.1 Terminus
Cursor Composer 1.5 | DeepSeek DeepSeek V3.1 Terminus | |
|---|---|---|
| Overview | ||
| Company | Cursor | DeepSeek |
| Release date | Feb 8 2026 | Sep 22 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 67% | — |
| Timeline | ||
| Release gap | DeepSeek V3.1 Terminus shipped 139 days before Composer 1.5 | |
Which is better: Composer 1.5 or DeepSeek V3.1 Terminus?
Composer 1.5 and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3.1 Terminus shipped 139 days before Composer 1.5, so benchmark comparisons should account for the intervening progress.
Composer 1.5 is proprietary, while DeepSeek V3.1 Terminus is open weight.
Direct benchmark comparisons are unavailable — Composer 1.5 and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 1.5 was released by Cursor on Feb 8 2026.
DeepSeek V3.1 Terminus was released by DeepSeek on Sep 22 2025.
Composer 1.5 is a proprietary model released by Cursor. DeepSeek V3.1 Terminus is an open weight model released by DeepSeek.
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