Intelligence Layer / LLMs

Selecting and managing the actual brains of AI: proprietary vs. open-source LLMs, reasoning models, small language models, and the criteria for sound model decisions in enterprise environments.

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The Brains of AI: GPT-4o, Gemini, Claude and the Evolution of Reasoning Models

GPT-4o, Gemini 1.5 Pro, Claude 3.5 Sonnet — the performance landscape of large language models in 2026 is hard to navigate. This article benchmarks the leading models on practical criteria, explains the paradigm shift toward reasoning, and answers the defining question: when is a local small language model sufficient — and when do you need the cloud giants?

May 29, 2026