The Hidden Architecture of the Agentic Enterprise: Model Stack, Tokenomics, and Harness

Short summary

CTOs must build proprietary agentic architectures with diversified model stacks to avoid vendor lock-in: SOTA models (Claude Opus, GPT-5.5) for complex reasoning; workhorse models (GLM, Gemini) at 5x lower cost for bulk work; lightweight models (Qwen, Llama) for speed and privacy. Single-provider dependency creates critical business risk when vendors alter pricing or behavior. Resilient platforms route work across open and closed ecosystems, auto-swapping models based on cost, latency, and availability.

• •Three-tier model stack: SOTA (reasoning), Workhorse (scale), Lightweight (speed/privacy)
• •Vendor lock-in is a strategic and operational risk; Antigravity example shows overnight workflow breaks
• •Hot-swappable model routing across providers is a business requirement, not a preference

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