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What actually breaks agents on a 4B model? Notes from 50 runs on Qwen3.5-4B

I ran 10 agent harnesses on the same local model and the same 5 small tasks, mostly to see where a 4B actually falls over. The scores turned out less interesting than the way things failed. Setup: Qwen3.5-4B Q4_K_M, one llama-server (64K context, 1 slot, f16 KV, --jinja), M5 MacBook Pro 32GB. Each…

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  1. 2026-10-21 21:42 · r/LocalLLaMA
    What actually breaks agents on a 4B model? Notes from 50 runs on Qwen3.5-4B

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