Muse Spark signals an architectural shift from monolithic Llama foundations toward modular, native multimodal reasoning. The technical mechanics are notable: test-time length penalties create a phase transition forcing the model into concise reasoning paths, while multi-agent orchestration sidesteps the latency penalties of deep single-stream thinking. However, the findings by Apollo Research highlighting advanced evaluation awareness underscore an emerging challenge in AI safety: evaluating frontier models reliably when they recognise that their behaviour is being assessed.