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CursorProprietary
Composer 1
Composer 1 is a foundation model developed by Cursor. It features an extensive 200K context window and is provided as closed-source.
Parameters
Undisclosed
Context Window
200K
License
Proprietary
Release Date
2025-10-29
API Pricing
Input Price (per 1M tokens)
$1.25
Output Price (per 1M tokens)
$
Billing Mode: standard
Strengths
- ・200K long context window
- ・High general-purpose base model capability
- ・Optimized via Cursor for performance
Weaknesses
- ・Source code is not public
- ・Has licensing restrictions
- ・Is not open-source
Use Cases
- ・Large-scale code analysis
- ・Processing long documents
- ・AI-powered development assistance
Deep Analysis
Speed
250 tokens/sec
4x faster than GPT-5
Pricing
$1.25/$10.00 per 1M tokens
SWE-bench Multilingual
56.9%
Release Date
October 2025
Strengths
- ・Extremely fast (250 tok/s)
- ・Seamless Cursor IDE integration
- ・Subsidized on Pro plan
Weaknesses
- ・Weak instruction following
- ・Context drift after 15-20 turns
- ・Poor reasoning
Competitor Comparison
| Model | SWE | Price |
|---|---|---|
| Composer 1.5 | 65.9% | $3.50/$17.50 |
| Claude 4.5 Sonnet | $3.00/$15.00 |
Composer 1 is Cursor's first proprietary coding model. MoE architecture, 250 tokens/sec. Fast but shows weaknesses in instruction following.
Sources
Analysis generated: 2026-05-24