Architecture search is moving toward post-training model transformation

A hybrid Transformer–state-space report claims over 99% lower adaptation cost and up to 2x decoding throughput at 128K context; Intern Lumina U2 reports 4.45x faster image generation with a multi-codebook diffusion design, though evidence is limited. Reflection’s open-weight Beam 501B MoE, with 23.4B active parameters and 1M context, reports 81.6% SWE-bench Verified. Independent validation, long-context reliability, and deployment costs remain important tests.