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Three production coding agents, five real tasks measured by time, tokens, and PR quality. No marketing — the actual measurement.
Claude Code leads long-horizon agentic work, Cursor wins for fast daily interactive editing, Aider dominates CI-pipeline automation, and GitHub Copilot fits teams built around GitHub PRs; Windsurf competes with fresh traction. After a year using all five hard, the most productive combination for most people is still Claude Code plus Cursor.
The AI tool stack a developer uses in 2026 looks nothing like it did eighteen months ago. Agentic editors, review tools, terminal agents, and test assistants have settled into recognizable roles. A practical guide by category.
Claude 3.7 Sonnet, released by Anthropic on February 24, is a careful refinement rather than a generational jump. The same model answers in standard mode or in an extended thinking mode you switch on per request, trading tokens and latency for better results on hard problems. It also ships Claude Code, a command-line tool for programmers.
