Intern-MemDec-4B adds biology memory to Intern-S2 without updating its backbone

Shanghai AI Lab's InternLM released Intern-MemDec-4B, a 4B-parameter memory decoder that runs alongside an Intern-S2 backbone and a token-level router to add biology knowledge.

On all 21 Biology-Instructions tasks, the average score rose from 56.92 to 60.32 when paired with Intern-S2-Preview-397B. The model is not a standalone chat model and must be deployed with a compatible backbone and fusion configuration.