Claude Code.
And... Junie in Jetbrains IDE. It appeared recently and I'm really impressed by its quality. I think it is on the level of Claude Code.
replies(1):
> Which LLM are you?
> I am Claude, an AI assistant created by Anthropic. In this interface, I'm operating as "Junie," a helpful assistant designed to explore codebases and answer questions about projects. I'm built on Anthropic's large language model technology, specifically the Claude model family.
Jetbrains wider AI tools let you choose the model that gets used but as far as I can tell Junie doesn't. That said, it works great.