The full landscape of AI coding agent harnesses available today
If you're using agents to build things, you have several harnesses to choose from. On the big-company side there's OpenAI Codex and Anthropic Claude Code. On the indie side there's AMP, Cursor (which is no longer truly independent — it's now owned by Elon), Devin by Cognition, and Factory. Each has its own trade-offs, but the core question is which environment lets you scale yourself horizontally — running as many agents as possible without the technical overhead of managing local code collisions and work trees.
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