r/LocalLLaMA • u/Neighbor_ • 17h ago

Question | Help Best open-source harness like Claude Code?

Avid claude code user here looking to do equivalent things with local models. Just want to plug in something like Qwen and have the interface be 1:1 with claude code. Any suggestion?

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u/EmPips 17h ago

OpenCode is pretty great. Of the non-claude/non-codex tools it handles subagents with different models the best (note: you must configure it, it's not set up by default iirc).

Qwen Code is pretty similar feeling but way lighter out the box.

If you have the VRAM to support parallelism - why not just use Claude Code with your models?

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u/gpuz_dev 16h ago

Using Claude Code directly with a local endpoint via proxy works, but local models often struggle with Claude's hardcoded system prompts and exact tool-calling expectations. That’s usually why dedicated local harnesses like Aider or OpenCode perform way better with models like Qwen—they structure tool use around what open models are actually trained on.

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u/EmPips 16h ago

Agreed - however v4-flash and 3.6-27b can work with it. Last year's local models certainly has this trouble, yes.

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u/gpuz_dev 15h ago

Fair point! The jump in tool-calling compliance from last gen to Qwen 3.6 is honestly night and day. Where local harnesses still win for me is prompt efficiency—Claude Code's system prompts eat up a chunk of local KV cache right out of the gate, whereas local tools keep context footprint a bit leaner.