Ampcode have a CLI, which is their agent using Claude 4.
Google also came out with Jules a few days ago.
There's aider, with which you can use whichever LLM you'd like.
I'm pretty sure that there are others...
Ampcode I heard of, but I also heard it's very expensive, same for Devin. I also don't know if either of them support MCP.
I'm sure there are others, of varying quality, but realistically, the options you'd want to use are the ones I listed I think.
P.S.: I'd been looking for alternatives by the way, something that lets me use OpenAI models, I've yet to try it but heard good things about: https://block.github.io/goose/