What is Composer 1.5
Composer 1.5 is a self-developedCursorlaunched byAI codingmodel, trained by scaling up reinforcement learning 20x. The model is a "thinking" model that can dynamically generate thinking tokens to reason about the codebase, supporting fast responses for simple questions and sustained deep thinking for complex tasks. Composer 1.5 has self-summarization capabilities, automatically compressing its state to continue exploring when the context is exhausted. In internal benchmark tests, the model has surpassed its predecessor, with significant improvements on challenging tasks.
Main features of Composer 1.5
- Intelligent coding agent capabilities: Composer 1.5 has agentic capabilities and can autonomously handle various coding tasks.
- Thinking-based reasoning mechanism: The model generates thinking tokens while responding to queries, reasoning about the user's codebase and planning the next steps.
- Adaptive thinking depth: The model is trained to answer simple questions quickly with as little thinking as possible, and to keep thinking on difficult questions, enabling flexible handling of tasks of varying difficulty.
- Self-summarization feature: To handle longer-running tasks, Composer 1.5 has self-summarization capabilities. When the available context is exhausted, it can generate useful summaries, enabling the model to continue exploring solutions.
- Recursive processing capability: On difficult examples, the self-summarization process is triggered recursively multiple times, allowing the model to largely maintain its original accuracy as the context length changes.
- Reinforcement learning scaling: Composer 1.5 was built by further scaling up reinforcement learning 20x on the same pretrained model. The compute used for post-training even exceeds the compute used for pretraining the base model, bringing predictable intelligence improvements.
How to use Composer 1.5
- Get access: Visit theCursorofficial website and set Composer 1.5 as the default coding model in settings.
- Choose usage scenarios: Composer 1.5 is especially suitable for interactive coding scenarios. The official recommendation is to prioritize Composer 1.5 in daily development.
- Daily coding use: Simply initiate coding requests as usual in the Cursor editor. The model will automatically determine task difficulty and adjust thinking depth, responding quickly to simple questions and automatically reasoning deeply on complex problems.
- Handle complex tasks: For challenging coding problems, Composer 1.5 will automatically enter deep thinking mode, generating thinking tokens to reason about your codebase and plan operation steps, with no manual setup required.
- Long task processing: When handling longer-running tasks, Composer 1.5 will automatically trigger the self-summarization mechanism.
Application scenarios of Composer 1.5
- Complex code refactoring: Composer 1.5 can understand the business logic of legacy code through deep reasoning, automatically plan and safely execute large-scale refactoring tasks spanning multiple files.
- Long codebase maintenance : With the help of the self-summarization mechanism, Composer 1.5 automatically compresses context when handling large projects with tens of thousands of lines of code, continuously maintaining understanding and coherence of the codebase's global logic.
- Multi-file project development: In Agent mode, Composer 1.5 can autonomously analyze requirements, plan architecture, create and modify multiple files, and independently complete the development of full feature modules.
- Tricky Bug Fixes: Composer 1.5 deeply analyzes the root causes of complex errors by generating thinking tokens, and reasons out precise fixes.
- Algorithm Design and Optimization : When facing complex algorithmic problems, Composer 1.5 engages in sustained deep thinking, explores multiple implementation paths, and provides solutions with better time or space complexity.