OpenCode vs Claude Code vs Codex: The AI Agent War Nobody Planned
In January 2026, Anthropic made a quiet change. They blocked Claude Pro and Max subscribers from using Claude through third-party tools. No announcement. No warning. Tools like OpenCode just stopped working overnight. The backlash was immediate. David Heinemeier Hansson — the creator of Ruby on Rails — posted on X: “Confirmation that Anthropic is intentionally blocking OpenCode, and any other 3P harness, in a paranoid attempt to force devs into Claude Code. Terrible policy for a company built on training models on our code, our writing, our everything.” ...