What Sets Them Apart
Pricing is the most immediate differentiator. Cursor offers a limited free tier (2,000 completions + 50 slow premium requests) and requires Pro at $20/month for serious usage, with Pro+ at $60/month and Ultra at $200/month for power users. Windsurf provides a free tier with 25 credits and charges $15/month for Pro. Trae is entirely free with unlimited access to Claude 3.5 Sonnet and GPT-4o — ByteDance absorbs all costs. For developers on a tight budget, Trae is unmatched. For those willing to pay, the question becomes whether Cursor's premium justifies the extra $5/month over Windsurf.
AI Features and Pricing
AI quality and agent capabilities separate these editors most clearly. Cursor's "Composer" (now called Agent mode) is the most mature agentic system — it handles multi-file edits, terminal command execution, automatic error fixing, and iterative refinement with high reliability. Cursor also pioneered features like predictive edits (Tab to accept multi-line changes) and the @ symbol for context control. Windsurf's Cascade excels at deep codebase understanding through its repository-wide indexing and persistent memory across sessions, making it especially strong for navigating and modifying large existing projects. Trae's Builder mode is capable for project scaffolding and multi-file generation but lacks the refinement and reliability of Cursor's agent mode.
Model support varies significantly. Cursor offers the widest selection: Claude 3.5/4 Sonnet, GPT-4o, GPT-4.1, o1, o3, Gemini 2.5 Pro, and more — with a credit-based system where different models consume different amounts of credits. Windsurf supports Claude, GPT-4o, and Gemini models on paid plans, with their proprietary models on the free tier. Trae provides Claude 3.5 Sonnet and GPT-4o for free but has a more limited model selection overall. Cursor's model flexibility is a significant advantage for developers who want to switch models based on task complexity — using cheaper models for simple completions and premium models for complex reasoning.
Model Support and Flexibility
Reliability and edge-case handling favor Cursor. After over two years of development and millions of users, Cursor has polished its diff application, conflict resolution, and error recovery to a level that competitors have not yet matched. Cursor's inline diff viewer is best-in-class, showing proposed changes clearly before you accept them. Windsurf occasionally produces phantom edits or misapplied diffs, though it has improved substantially in recent months. Trae, being the youngest of the three (public beta since January 2025), exhibits the most inconsistency — Builder mode can fail silently on complex multi-file operations, and error messages are sometimes unhelpful.