Composer is the feature that makes Cursor more than just another code editor with AI chat. With Composer 1.5 (released February 2026), it now features adaptive thinking depth and self-summarization for longer tasks. It edits multiple files simultaneously, shows you every diff, and in Agent mode, autonomously navigates your codebase. Learn how to use it like a professional.
Released in February 2026, Composer 1.5 was built by scaling reinforcement learning 20x beyond Composer 1. Post-training compute for this release actually surpassed pretraining compute, making it Cursor's most capable model to date.
Composer 1.5 is a thinking model. It dynamically allocates more reasoning to complex tasks — refactoring a tangled dependency graph gets deep analysis, while a simple rename gets a quick pass. This means faster responses on easy tasks without sacrificing accuracy on hard ones.
Long Composer sessions used to degrade as context windows filled up. Composer 1.5 summarizes its own progress as it works, allowing it to handle longer, multi-step tasks without losing accuracy or forgetting earlier changes.
Cursor offers three distinct ways to interact with AI. Understanding when to use each one is the difference between productive AI coding and frustrated prompt mashing. For more shortcuts and workflows, see our Cursor tips and tricks guide.
Inline autocomplete
Ghost-text completions that appear as you type. Tab predicts your next edit based on recent changes and accepts with a single keystroke. Best for line-level speed boosts while you are actively writing code.
Cmd+L / Ctrl+L
Opens a sidebar conversation about your code. Ask questions, get explanations, and receive suggestions you manually apply. Chat does not directly modify files. Best for understanding code and exploring approaches.
Cmd+I / Ctrl+I
Multi-file AI editing. Composer reads across your project and applies coordinated changes to multiple files, showing diffs before applying. Use Cmd+Shift+I for full-screen mode. Best for implementing features across files.
Toggle in Composer
Autonomous Composer that searches your codebase, reads files, runs terminal commands, and makes multi-step changes. You describe the goal and Agent figures out the rest. Best for complex, multi-step tasks.
Here is how experienced developers use Composer to implement features that span multiple files — the workflow that makes Cursor genuinely more productive than alternatives like GitHub Copilot.
Before typing your request, add the relevant files to Composer's context using @ references. If you are adding a new API endpoint, reference your existing route file, a similar controller, your types file, and any relevant middleware. This gives Composer the patterns and conventions it needs to generate consistent code.
"Add a new GET /api/users/:id endpoint that returns the user profile with their recent posts. Follow the same pattern as the existing /api/teams/:id endpoint." This kind of specific, pattern-referencing prompt produces dramatically better results than vague requests. Name the patterns you want followed.
Composer shows you the proposed changes for each file as a diff. Review them individually. Accept the ones that look correct, reject the ones that need changes, and provide follow-up instructions for anything that needs adjustment. This incremental review process is how you maintain code quality while moving fast.
Composer maintains context across messages within a session. If the first pass missed something, describe what needs to change and Composer will adjust. "The error handling is missing in the controller. Add try/catch with the same pattern used in TeamsController" is far more effective than starting a new Composer session from scratch.
These patterns separate developers who love Composer from those who find it frustrating. Whether you are comparing Cursor vs Claude Code or already committed to Cursor, these workflows apply.
One Composer session should accomplish one coherent task. "Add the user profile endpoint" is good. "Add user profiles, notifications, and settings" is too broad. Smaller tasks produce more accurate code and are easier to review.
"Follow the same pattern as UserController" tells Composer exactly which conventions to match. Without explicit pattern references, Composer invents its own conventions, leading to inconsistent code that clashes with your existing codebase.
When you are not sure which files need to change, Agent mode excels because it can search and discover relevant files on its own. Switch to standard Composer when you know exactly which files to modify and want more predictable, controlled output.
After accepting Composer's changes, immediately run your test suite and build process. Composer can generate code that looks correct in the diff but introduces subtle type errors, missing imports, or broken edge cases that only surface at compile time or during testing.
Since June 2025, Cursor uses a credit-based pricing model. Agent mode with the auto-selected model is unlimited on Pro plans. Manually selecting premium models (like Claude Sonnet or GPT-4) consumes credits from your monthly allowance. For full pricing details, see our Cursor AI pricing breakdown.
Build Fast With AI includes an entire module on mastering Cursor's Composer, Agent mode, and multi-file workflows — including the new Background Agent for async tasks. Learn the context management techniques, prompting patterns, and verification systems that make AI-assisted development reliable and fast. Lifetime access for a one-time payment.
Get the Course for $79.99Cursor Composer is Cursor's multi-file AI editing mode, opened with Cmd+I (or Cmd+Shift+I for full-screen). While Chat (Cmd+L) lets you ask questions in a sidebar conversation, Composer reads across your project and applies coordinated changes to multiple files simultaneously. Think of Chat as asking a colleague for advice, and Composer as handing them the keyboard. Composer shows diffs for every file it changes, letting you accept or reject each modification individually.
Composer 1.5 was released in February 2026 and represents a major leap — built by scaling reinforcement learning 20x beyond Composer 1, with post-training compute actually surpassing pretraining compute. It is a thinking model with adaptive thinking depth: it uses more reasoning for complex tasks like multi-file refactors and less for simple edits. It also features self-summarization, which lets it handle longer tasks without losing accuracy as the context window fills up.
Agent mode is Composer's most powerful setting. When enabled, Composer can autonomously search your codebase, read files it needs for context, run terminal commands, and make multi-step changes without you manually specifying which files to edit. It operates like an autonomous coding agent that plans and executes a sequence of actions. Since June 2025, Agent mode with the auto-selected model is unlimited on Pro plans. Manual premium model selection uses credits.
Yes, and Composer 1.5 handles them better than before thanks to self-summarization. Composer excels at refactoring tasks that touch 5-15 files with a clear scope. For larger refactors (30+ files), break the work into smaller batches and run Composer multiple times. The key is providing clear context about patterns to change and what the target state looks like. With Composer 1.5's adaptive thinking, complex refactors get deeper analysis automatically.
Composer automatically reads files in your workspace to build context, but you can also manually add files using the @ symbol (for example, @filename.tsx). The quality of Composer's output is directly proportional to how well you manage its context. Adding too many files overwhelms the model; adding too few leaves it guessing. The best practice is to @ reference the specific files relevant to your task and let Agent mode discover additional dependencies as needed.
Since June 2025, Cursor uses a credit-based system. The Pro plan ($20/month) includes unlimited Composer requests when using auto mode (Cursor picks the model). Manually selecting premium models like Claude Sonnet or GPT-4 consumes credits from your monthly allowance. The free tier offers limited Composer access with restricted request counts and model quality. For professional development, the Pro plan is effectively required.