# o1 Architecture Speculative Analysis: Behind Closed Doors — Public Observations + Reverse Engineering

> Source: https://sukruyusufkaya.com/en/learn/llm-muhendisligi/o1-mimari-spekulatif-analiz
> Updated: 2026-05-13T13:00:30.810Z
> Category: LLM Mühendisliği
> Module: Module 17: Reasoning Models — Test-Time Compute Revolution
**TLDR:** Speculating o1 architecture (not disclosed by OpenAI) by combining public observations + academic papers + community reverse engineering. Combination of PRM (Process Reward Model) + MCTS (Monte Carlo Tree Search) + RL? Hints from pricing model. AI safety + commercial meaning of hidden reasoning tokens. Reflection from R1 paper — what did open alternative teach?