The 2025-2026 landscape isn't 'bigger is better' anymore. What matters is knowing why small models and reasoning models exist, the test-time-compute tradeoff, and routing the right model to the right task. Here is the practitioner's view.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
The 2025-2026 landscape isn't 'bigger is better' anymore. What matters is knowing why small models and reasoning models exist, the test-time-compute tradeoff, and routing the right model to the right task. Here is the practitioner's view.
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