The market for AI coding assistants has matured rapidly, evolving from simple autocomplete tools into agent-driven platforms. The ranking weighed factors including market adoption, benchmark performance on Terminal-Bench and SWE-bench, developer satisfaction, integration depth, pricing, and agentic workflow quality. GitHub Copilot remains the undisputed market leader with a 42 percent share of paid AI coding tools and 4.7 million paid subscribers, representing 75 percent year-over-year growth. In February 2026, GitHub launched agent mode, enabling multi-agent workflows across Copilot, Claude, and Codex agents. The free tier offers 2,000 completions and 50 chat or agent requests per month, while the Pro+ plan at $39 per month provides 1,500 premium requests. Cursor commands an estimated 18 to 25 percent of market revenue, with its Composer feature handling complex multi-file projects by mixing frontier models from Anthropic, OpenAI, and Google. At $20 per month for the Pro plan, Cursor competes directly on price. Claude Code (Anthropic) operates entirely in the terminal and achieved a 78.9.