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

User reports Qwen3.8-Flash-Next at 1900 t/s prefill and 90 t/s generation on an M5 Max 128GB. Setup is mlx-serve with Sushi-4 quant, an MLX-EXL3 hybrid, with MTP and Vision supported. User also cites M1 Max 64GB at ~350 t/s prefill and 30 t/s gen, and M5 Pro at ~900 t/s prefill and 60 t/s gen.