Last month, Anthropic announced that the Claude agent SDK would no longer share the same usage pool as the Claude subscription.

This made alternative Claude Code UIs ("wrappers") virtually useless, because a better UI cannot compete with the subsidized subscription costs.

This felt a bit anticompetitive to me. Many people prefer third-party UIs over Claude Code, and instead of making a better product to win people over, Anthropic tweaked the subsidy structure to make the alternatives unaffordable.

I canceled my subscription since I prefer to use Claude Code through Isomux. Thankfully, Isomux supports Codex too, so I was going to use only Codex from now on.

The policy was set to take effect yesterday, but Anthropic backtracked on it at the last minute.

But the lesson for people building agentic tooling stands: never rely on a single provider.