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Anthropic has updated its legal documentation to explicitly clarify a longstanding policy banning the use of third-party harnesses (wrappers/tools) with Claude subscription accounts. OAuth tokens from Claude Free, Pro, and Max tiers are only permitted for use with Claude Code and Claude.ai. The policy has technically existed since at least February 2024, but was being widely flouted by third-party tools that allowed users to route cheaper subscription tokens instead of paying API rates. Anthropic began enforcing the ban in January 2026, banning accounts and blocking spoofed Claude Code traffic. OpenCode has already removed support for Claude subscription keys in response. The move is framed as protecting Anthropic's revenue model from token arbitrage, while OpenAI took the opportunity to publicly endorse third-party harness use with its own Codex subscriptions.

Anthropic clarifies ban on third-party tool access to Claude