Composer 2 - Cursor's next-generation AI programming model

What is Composer 2?

Composer 2 is Cursor's next-generation AI programming model, positioned as the "optimal balance between intelligence and cost." Priced at only $2.50 per million tokens, it achieved approximately 61% of the CursorBench test score, with performance approaching GPT-5.4 (medium) and significantly reduced cost. In Terminal-Bench 2.0, it achieved 61.7% (compared to only 47.9% in its predecessor, version 1.5), surpassing Opus 4.6. The model is the first to utilize continuous pre-training and large-scale reinforcement learning techniques and is now officially available on the Cursor platform.

Main features of Composer 2

• Intelligent code generationIt automatically generates complete code based on natural language descriptions, supporting end-to-end implementation of complex programming tasks.
• Code editing and refactoringIt understands the existing codebase and makes intelligent modifications, automatically refactoring and optimizing the code structure.
• Conversational programmingIt supports follow-up questions and iterative development through context-aware continuous dialogue and AI collaborative coding.
• Multilingual supportSupports mainstream programming languages such as Python, JavaScript, TypeScript, and Go.
• Tool IntegrationIt is deeply integrated with the Cursor editor, supporting terminal command execution and external tool invocation.
• Autonomous task executionAs an Agent model, it autonomously plans and executes multi-step programming tasks, significantly improving development efficiency.

Composer 2 Technical Principles

• Continuous PretrainingCursor is the first to continuously pre-train the base model, further learning on general programming data to enhance code understanding and generation capabilities.
• Scaled Reinforcement Learning: Optimize model behavior through large-scale reinforcement learning, enabling it to make better decisions in complex programming tasks and improve the quality of end-to-end task completion.
• Agent architecture designComposer 2 adopts an Agent architecture, which can autonomously plan multi-step tasks, call tools (such as terminals and file operations) and interact with the environment to achieve automated delivery from requirements to code.
• Specialized optimizationIt is deeply optimized for programming scenarios, including specialized training for tasks such as code completion, refactoring, and debugging, enabling it to perform excellently in programming benchmark tests such as CursorBench and Terminal-Bench.

Key information and usage requirements for Composer 2

• positionA programming model that achieves the optimal balance between intelligence and cost
• Pricing$2.50 / 1 million input tokens
• performanceCursorBench: approximately 61%; Terminal-Bench 2.0: 61.7%.
• technologyFirst-time continuous pre-training + large-scale reinforcement learning
• contrastPerformance is close to GPT-5.4 (medium), but cost is significantly reduced.
• platformRequires the Cursor editor to be installed.
• VersionIt is now officially available in Cursor and requires no additional configuration.
• accessUse directly through the Composer feature entry point

Composer 2's core advantages

• Ultimate cost-effectivenessAchieving near-GPT-5.4 (medium) intelligence at a low cost of $2.50/million tokens redefines the cost-efficiency boundary of programming models.
• Performance leapTerminal-Bench 2.0's score has increased significantly from 47.9% in version 1.5 to 61.7%, surpassing Opus 4.6, demonstrating a significant improvement in code comprehension and execution capabilities.
• Technological breakthroughThis is the first time that continuous pre-training and large-scale reinforcement learning have been introduced, and the model’s reasoning and planning capabilities in complex programming tasks have reached a new level.
• Open and use immediatelyIt has been officially launched on the Cursor platform. No additional configuration is required. You can directly experience cutting-edge programming intelligence through the Composer entry point.
• Agent capabilitiesIt supports autonomous planning and execution of multi-step programming tasks, enabling end-to-end automated development from requirements description to code delivery.

How to use Composer 2

• Install CursorDownload and install the latest version of the Cursor editor.
• Login accountOpen Cursor, log in to your account, and start using it.
• Enter ComposerClick the Composer icon in the left sidebar, or use the keyboard shortcut to open the Composer panel.
• Start conversationDescribe your programming requirements in natural language in the input box, and Composer 2 will automatically understand and generate code.
• Iterative developmentThe dialogue continues based on the generated results, prompting further questions about modifications, optimizations, or expansions of the functionality, supporting multiple iterations.
• Execute operationComposer 2 can autonomously execute terminal commands, create and modify files, and invoke tools to complete complex tasks.
• PrecautionsEnsure a stable network connection and use the latest version of Cursor for the best experience.

Comparison of similar competing products with Composer 2

Application scenarios of Composer 2

• Building a project from scratchIt automatically generates complete project structure and code files based on natural language requirements descriptions, enabling rapid launch and prototype development of new applications.
• Functional module developmentEnd-to-end implementation of specific business functions, such as complex modules like user authentication systems, payment interface integration, and data visualization charts.
• Code refactoring and optimizationIt intelligently analyzes the existing codebase, automatically identifies outdated code patterns and refactors them, improving system performance and long-term maintainability.
• Bug fixes and debuggingIt accurately locates the root cause of code errors, generates targeted fixes, and automatically executes the modifications, significantly shortening the debugging cycle.