Qwen3.8 27B

User reports Qwen 3.8 27B at 31-34 t/s generation and around 1,080 t/s prompt processing on a single RTX 3090 24 GB. Setup is llama.cpp with CUDA, UD-Q4_K_XL quant, 64K context, turbo3 KV cache, 2 parallel slots. User compares four agent configurations: Qwen alone (1/5 scenes right, 26 min, $0), Sonnet 5.5 planning with Qwen coding (2/5, 85 min, $0.67), Qwen planning with Sonnet 5.5 coding (4/5, 14 min, ~$2.77), and Sonnet 5.5 alone (4/5, 9 min, $1.83). A 3060 12 GB was tried first and gave 4-6 t/s with ~7 GB of weights spilling into system RAM. User notes Qwen is a better planner than coder, that thinking budget had to be capped, and that crash checks reported zero errors while some scenes were visibly wrong. One run per setup, described as a field report rather than a benchmark.