GLM-5.3 320B (18B active) Flash

User reports GLM-5.3-Flash at 21.96 t/s decode (narrative) and 26.10 t/s (code) on 2x RTX 5090. Setup is llama.cpp with IQ4_XS GGUF weights, f16 KV cache, 204800-token context, DFlash2 Q4_K_M draft model with speculative decoding (n=3), and MoE expert tensors offloaded to CPU. Prefill measured 421.07 t/s at ~10K prompt tokens and 448.20 t/s at ~87K. Soak test passed with p50 decode 20.70 t/s and 100% TPS retention over 25 turns. Expert cache was requested but not allocated (CACHE_DISABLED), so the run measured a half-cached path. Stress test failed the long-context recall ladder.