In the battle between two “agentic” coding tools — Anthropic’s Claude Code and OpenAI’s Codex CLI — the latter appears to be fostering more developer goodwill than the former. That’s at least partly because Anthropic has issued takedown notices to a developer trying to reverse-engineer Claude Code, which is under a more restrictive usage license than Codex CLI.

Claude Code and Codex CLI are dueling tools that accomplish much of the same thing: allow developers to tap into the power of AI models running in the cloud to complete various coding tasks. Anthropic and OpenAI released them within months of each other — each company racing to capture valuable developer mindshare.