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The tooling is totally replicated in open source. OpenCode and Letta are two notable examples, but there are surely more. I'm hacking on one in the evenings.

OpenCode in particular has huge community support around it- possibly more than Claude Code.

I know, I use OpenCode daily but it still feels like it's missing something - codex in my opinion is way better at coding but I honestly feel like that's because OpenAI controls both the model and the harness so they're able to fine tune everything to work together much better.

It's there now, `opencode models --refresh`

GLM works wonderfully with Claude, just have to set some environment variables and you're off to the races.

If tooling really is an advantage why isn't it possible to use the API with a subscription and save money?

In my opinion it is because if you control both the model and the harness then you're able to tune everything to work together much better.