Qwen3.8 125B (6B active) Flash-Next

User reports Qwen3.8-Flash-Next IQ3_S on an RTX 5080 16 GB with a Core Ultra 9 285K and 62 GB DDR5-6800, averaging 154.9 t/s generation and 5,475 t/s prompt processing in a context sweep of fresh 15K-207K prompts. Setup is Basalt with IQ3_S weights, 262K context and int8 KV cache, using 15.7 GB VRAM and 54.1 GB system RAM. An agent coding session over 103 requests reached 153.0 t/s average generation with a 262 t/s peak, and 5,011 t/s average prefill; 99.5% of prompt tokens came from cache with a 0.2 s median time to first token.