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AI Architectures Remain Surprisingly Simple—Even in Production

Menlo VenturesDecember 2025
AI Architectures Remain Surprisingly Simple—Even in Production
Chart by Menlo Ventures. Source: menlovc.com

Bar charts showing the AI customization approaches and workflow/agent usage among enterprises and startups, indicating that simple methods like prompt design, RAG, and fixed sequence workflows remain the most widely adopted.

LabelValue shown on the chart
Prompt design (Enterprises)38%
Prompt design (Startups)31%
RAG (vector search) (Enterprises)34%
RAG (vector search) (Startups)35%
Fine-tuning (Enterprises)12%
Fine-tuning (Startups)6%
Fixed sequence workflow (Enterprises)39%
Fixed sequence workflow (Startups)27%
Routing-based workflow (Enterprises)26%
Routing-based workflow (Startups)27%
Single-shot workflow (Enterprises)18%
Single-shot workflow (Startups)19%

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