Blueberry

Claude Code

Anthropic's official agentic coding CLI — lives in your terminal, reads entire codebases, and executes multi-step tasks autonomously. Surpassed $1B ARR within months of general availability. Multi-agent Code Review ships as a cloud feature that catches bugs before human reviewers see them. The tool Anthropic itself uses for ~60% of internal development work.

Cursor

The leading AI-native IDE — a VS Code fork rebuilt around deep codebase understanding. Composer mode makes coordinated multi-file edits that Copilot can't match; Background Agents work while you focus on other tasks. Reached $2B ARR and $29B valuation by early 2026. The reference tool for serious AI-assisted development despite $20/month pricing and a controversial mid-2025 billing change.

Codex

OpenAI's cloud-based software engineering agent — assigns coding tasks to AI agents running in parallel, isolated sandbox environments preloaded with your repository. GPT-5.3-Codex can work autonomously for 7+ hours on complex tasks. Integrated into ChatGPT and GitHub via the Codex CLI. AGENTS.md files customize behavior per repository, similar to Claude Code's CLAUDE.md.

Windsurf

AI-native IDE built around Cascade — an agentic engine that reads your entire codebase and makes coordinated multi-file edits from natural language. Formerly Codeium. Ranked #1 in LogRocket's AI Dev Tool Power Rankings (Feb 2026). Now owned by Cognition (makers of Devin) following a dramatic 2025 acquisition after OpenAI's $3B bid collapsed and Google hired much of the leadership.