Composer 2.5Smarter decisions for your most complex workflows

Composer 2.5

Composer 2.5 represents a major leap in AI-powered software development, delivering substantially improved intelligence and collaboration capabilities within the Cursor editor. Built on advanced reinforcement learning techniques and 25x more synthetic training data, this model excels at sustained, complex coding tasks while maintaining a pleasant, natural working relationship with developers.

Product Highlights

• Sustained Task Performance: Handles long-running development workflows without losing context or degrading output quality over extended sessions.
• Complex Instruction Following: Reliably interprets and executes multi-step, nuanced requirements that previous models struggled with.
• Improved Collaboration: Enhanced communication style and effort calibration make interactions feel more natural and productive.
• Advanced Training Architecture: Utilizes targeted textual feedback and sharded Muon optimization for precise behavioral improvements.
• Flexible Pricing Tiers: Standard tier at $0.50/M input and $2.50/M output tokens, with a faster variant at competitive rates.

Use Cases

• Large-Scale Refactoring: Safely restructure complex codebases across multiple files and dependencies with consistent architectural decisions.
• Feature Implementation: Build complete features from specifications, handling edge cases and integration points autonomously.
• Code Review Assistance: Identify subtle bugs, style violations, and optimization opportunities with detailed, actionable feedback.
• Learning and Exploration: Navigate unfamiliar codebases and technologies with guided, context-aware explanations.

Target Audience

Professional software developers, engineering teams, and technical leads who need an AI pair programmer capable of handling sophisticated, sustained development tasks with minimal supervision.